Archive of Our Own ^beta

Chapter Text

It was a beautiful day in early March, and Shouto was having lunch on the school roof with his boyfriends. It was the first day warm enough for the three of them to enjoy being outside without Izuku and Katsuki jockeying for position to be able to leech heat from Shouto’s left side. (Katsuki was particularly fierce in those ‘fights.’ He refused to admit it, but he hated the cold weather and was a bit of a baby about it.) 

It was only a couple of weeks until graduation, and Shouto was determined to make the most of the days they had left at UA. Izuku was dozing in the sunshine after practically inhaling his food, while Shouto and Katsuki sat together and ate at a more sane pace. The whole while, Shouto was soaking in the moment as much as he could, trying to hoard as many memories as possible before school ended and everything changed on him again. 

Not that he was complaining about the most recent paradigm shift in his life. It had been good for him in so many ways, big and small. For example, one of the many changes he appreciated was how, since they had started dating, Shouto’s lunch fare had significantly improved. Katsuki had found out how inconsistent Shouto was about eating his lunch and had been appalled. (It was mainly dependent on how tolerable the cafeteria food was that day. Lunch Rush was an excellent cook, but some foods were not edible for Shouto, no matter how well they were made.) 

Katsuki decided he was going to make Shouto's bento from then on and wouldn’t take no for an answer. He had caved quickly to his demands when he found out that Katsuki had no problem with adjusting the contents to Shouto’s tastes. In return, he insisted on Katsuki using his father’s credit card for all of the groceries, not just Shouto’s. The system was working out well so far, and now he was savoring yet another delicious meal with wonderful company. 

So obviously, changes weren’t always bad, even if, historically, Shouto had not had an easy time with them. Still, the permanency of no longer being a student at UA was a daunting prospect and made him all the more desperate to imprint these precious last days in his mind. 

While Shouto was ruminating on all of this, Katsuki was telling a story that he had been only half listening to (and even that half-attention was mostly so that Shouto could amuse himself with all the colorful phrases Katsuki was using). “...so when Shitty Hair rolled up with the fucking thing tied to the roof of the car, I was like, well, smack my ass and call me Daddy, I didn’t think you’d actually-” 

Unable to resist the siren call of such a blatant opening, Shouto interrupted. “I understand you wanting your ass smacked, but I thought you were the baby, not the daddy? If anything, Izuku would be the daddy.” It was something that had occurred to him a while ago, when Shouto first fully processed just how often Izuku referred to Katsuki as ‘baby’ in private. That, plus Izuku’s general vibe in… certain scenarios, had made him wonder. 

So far, Shouto hadn’t seen any evidence that they thought about it that way, but it might just be some strange hang-up about acknowledging it while he was there. Shouto couldn’t deny that he was curious, so he took the opportunity to bring it up. And if he got to mess with Katsuki and fluster him a bit, all the better. 

When it came, the reaction was better than Shouto could have hoped. He had been prepared for a minor explosion, but instead, Katsuki only got halfway through an indignant “YOU-” before the yell was strangled in his throat. A fiery red blush erupted over his whole face, and his palms crackled erratically in the way they only did when he was too overwhelmed to properly regulate. He tried a couple more times to form words, but any sound died before it reached his tongue. 

Oh, Shouto had hit the jackpot. A truly dumbstruck Katsuki was a rare sight. A delighted smile took over Shouto’s face. Katsuki noticed almost immediately, and his face twisted into a venomous scowl. 

Whoops. Shouto knew he hated being laughed at, but, well… he couldn’t honestly say he was sorry. It was too much fun to rile Katsuki up. All the moment needed was– ah, perfect, Izuku just woke up. Luck was certainly favoring Shouto today. 

In a sleepy voice that was so adorable it should be illegal, Izuku asked, “Shou? Wha’ happened, why’s Kacchan blushing like that?”

“Well, he was telling me about a dare Kirishima did, and said, ‘Well, smack my ass and call me Daddy.’” Shouto put air quotes around that. He wasn’t entirely sure he was using them correctly, but if he wasn’t, he trusted Izuku to let him know and not laugh at him. “I’m not sure exactly what that means, but I assume from context that it’s one of Tsuki’s odd idioms. So I told him that I thought he was the ‘baby’ and that if anyone was the ‘daddy,’ it would be you.”

He was rewarded for his retelling with a delighted laugh, as pretty as Izuku's laughs always were. Then he turned to Katsuki with a contemplative look in his eye. “Well, you are my baby. Would you like to call me that?” he asked, his head tilted in a way that looked far too innocent for the subject matter they were discussing. 

Now that the question had been posed, Shouto was intrigued by what Katsuki's answer might be. It... had seemed to Shouto like he would like that, but he didn't want to make assumptions, especially not about something like this. When he followed Izuku's gaze, what he saw certainly seemed to support his theory, though. Katsuki's eyes were wide, the color high on his cheeks, and his hands were still popping arrhythmically. He bit his lip before answering with a slight stutter. “I- I don’t fucking know. Wouldn’t that- would that be weird for you? …for either of you?” 

Oh. Katsuki was asking him? That was sweet, but unnecessary. Shouto knew what his answer was, but he took a small pause to gather his words, anyway. He wanted to get this right. “I don’t think it’s a problem for me, no. If you’re worried because of my father, I’ve never called the old man that in my life. It was always ‘Father.'" He was fairly sure that was the reason Katsuki thought it might be 'weird' for Shouto, anyway. Just in case it wasn't, though, he added, "And I get it. Izuku is very… parental when he’s in charge. Well, what I assume good parents are like, anyway. Caring, encouraging, coddling, indulgent, teasing to embarrass… it makes sense.” 

That was a big part of why Shouto had come to that conclusion in the first place. Katsuki made a considering face at that, like it was a perspective he'd never considered before. He didn't seem like he was denying it, at least.

Shouto was caught a little off guard when Katsuki, rather than addressing Izuku, asked him, “So would you want to call him that too, then?” 

Huh. Well, Shouto supposed that was a fair question, considering the context. It was an interesting idea, at the very least. He didn't think it was something he had any particular predeliction to, but... “Maybe? I’d be willing to try it out, at least.” After all, there were quite a few things that he hadn't been particularly interested in for its own sake, which had been very pleasurable when done with his partners. Pulling the conversation back to the other member of their trio, he checked, “Is that something you’d be interested in, Izuku?” 

Izuku's signature strawberry blush flared at the attention, or maybe the question itself? It was hard to tell. “I- Yeah, I think I might like that. With both of you. I wou- I don’t know if I- I’m not sure that I would act quite the same way that I normally do," he clarified hesitantly. "I- Even thinking about it kind of makes me want to wrap you both in blankets and feed you snacks, but also fuck you ‘til you cry??? So it’s somewhat different than my normal headspace, I think.” 

Oh. Oh my. Well, Shouto didn't have any complaints about that, none at all. The loud gulp from Katsuki said that he felt similarly about the prospect. Wanting to make his stance very clear, he said, “That sounds nice to me, so…” The sentence fizzled out, Shouto unsure how to phrase a request to make that happen soon. 

Katsuki seemed to understand what he was getting at, though, because he nodded decisively in response. Between the two of them, he was sure they would concoct some sort of Plan, at least. Shouto would leave them to it. For now, he concentrated on finishing his bento before they had to head back to class. It wouldn't do to miss out on Katsuki's delicious cooking, after all. 

Shouto had spent the rest of the school day in a bit of a daze. He still wasn’t quite sure how to deal with the recent development. On the one hand, it was reassuring to know that the whole ‘baby’ thing hadn’t been something he imagined or that they were holding back. And, well, watching Katsuki get so incredibly flustered from an idea that Shouto had was uniquely delightful. 

On the other hand, though, he was nervous. Shouto was fairly sure they intended to test out said idea soon, probably today. Before this, all of their activities had been things Izuku and Katsuki were well-practiced in, or at least familiar with. It had been reassuring to know that even if Shouto often felt out of his depth, they knew what they were doing. Not having that reassurance was more than a little nerve-wracking. 

More than that, though, was the simple fact that Shouto wasn’t sure where he fell into this new dynamic. He hadn’t registered how much he had been falling back on their typical team dynamics (despite the very different context) until he tried to do it for this and came up short. 

Calling Izuku ‘Daddy’ would certainly be… something, and both of them had seemed interested in it, so Shouto was more than willing to try. He didn’t think any of them wanted him to be the focus, though. Maybe he could still be Izuku’s support? That sounded nice, but Shouto wasn’t sure how that would even work. 

Shouto sighed, shook himself from his thoughts, and opened Katsuki’s door with the key he’d been given. Both Izuku and Katsuki had said many times that Shouto was allowed to ask as many questions as he wanted. He would just have to take them up on that. He looked around, wanting to get started on that, but- 

Oh. He’d been so caught up in his own worries, he hadn’t noticed that he was the first one to arrive. Well… shit. 

Shouto trudged over to the bed and sat down heavily. Waiting alone was never fun, but he did his best to turn off his thoughts until he had some sort of outlet. He was well-versed in how to keep his thoughts from spiraling while sitting alone, waiting, so that was what he did. 

Katsuki was the next to arrive, but he seemed uncharacteristically distracted, compared to his normal method of arrival (which tended to involve some level of pouncing once he registered Shouto’s presence). He wasn’t sure why until they locked eyes for a second and Shouto clocked the strung-out cast to Katsuki’s features. Oh. He Wanted this, badly. Maybe even Needed it, and the normally compulsively proactive boy had been stewing in that feeling for hours now. 

Some of the anxious tension in Shouto’s gut shifted, translating into protectiveness and a much more pleasant hunger. There was something incredibly alluring about Katsuki being so undone, especially by something Shouto had a hand in creating. Katsuki wasn’t quite spacey yet, but he could see the potential of it in his heightened breathing, his low flush, and red, too-wide eyes. 

It was perhaps a bit unhealthy, how often the sight of Katsuki’s agitation could soothe Shouto’s own. Granted, it was usually in the context of anger and frustration, but they were all flavors of passion, and it seemed that route in Shouto’s mind was well-paved enough to hold this anxious arousal, too. 

Still, the sudden shift was its own kind of unsettling. Shouto felt a wave of gratitude when Katsuki sat beside him, the scant centimeters between them both an offer and a request wrapped in one gesture. Shouto eagerly took him up on it, leaning heavily against Katsuki’s wide shoulder and clutching his hand like an anchor in a storm. 

Shouto was unsure if the soft warmth that spread from his center was more metaphorical or literal. Either way, he basked in it as Katsuki took his weight with grace, his breathing steadying at the connection. Shouto sat there, attuning himself to the sound of those slowing breaths, counting them to mark the time while they waited for the last piece of their triptych. 

After 63 breaths, they both heard the door latch open, quickly followed by shuffling footsteps and the series of impacts and clicks that meant Izuku had locked the door, including the deadbolt. A palpable ripple of released tension swept through Katsuki at the sound, and the hand Shouto held flexed and twitched with a restrained anticipation. The constant low pressure Shouto was pressing into their joined shoulders went from held to reciprocated, and the joy of being leaned on by Katsuki tasted like soda-sweet, effervescent bubbles on the back of his tongue. 

It only got sweeter at the sight of Izuku’s easy smile and attentive eyes looking them over. Izuku’s head tilted a few degrees the way it did when he noticed something fascinating. Shouto wasn’t sure he’d ever get used to being the object of that intense gaze, not entirely, but it wasn’t a bad feeling. He could see how Katsuki might feed off of it with his perpetual attention seeking, but for Shouto, it was less about being noticed and more about being Known. 

All his life, Shouto had been used to being stared at, though admittedly not usually at the level that Izuku did. It was only once Shouto had been exposed to the cutting perspectiveness behind those green eyes, though, that he had begun to shiver when they lingered on him. Izuku had always seemed to pay him more attention than most of their classmates, though Shouto had endlessly reminded himself that it was platonic. 

Remembering that now, when Izuku himself had told him that it very much wasn’t, sparked a small rush of epiphany, something that had happened at least a few times a day ever since these two had taken him into their bed. Even with how often it happened, it still made his breath catch. At that same instant, he felt the soft press of lips on the side of his face. The performative little smacking noise Izuku always made when he kissed his cheek was doubled as he quickly switched targets, wedging his face between Shouto and Katsuki affectionately. 

It wasn’t until he heard Izuku greet each of them by name with his typical fond warmth that Shouto realized neither he nor Katsuki had spoken a word this whole time. Before he could gather himself enough to respond in kind, Katsuki filled the gap by snatching Izuku up into a proper kiss, deep and eager. Both pulled away from it panting, and Izuku gave a delighted laugh. “Kacchan is so excited today,” he teased. “Does this mean you still want to try out what we talked about earlier?” 

Katsuki nodded, and Shouto did too when Izuku turned to him, for Katsuki’s sake as much as his own. With the immediate recalibration in his expression that said Izuku had laid out a Plan in his head for this scenario already, he turned back to Katsuki and asked, “And would you like me to fuck you today, sweetheart?” 

It still threw Shouto occasionally, how easily that sort of crude proposition came to Izuku's lips when they were like this. He was used to Katsuki’s foul mouth, but hearing ‘fuck’ in that clear, chiming voice was still odd, though thrilling. Shouto was swiftly pulled out of his mental stumble, though, by Katsuki’s emphatic “Oh, hell yes.” 

Izuku’s sweet, freckled face turned again to him, and this time the look in his eyes was heated and dark. “And you, Shouchan?” 

Shouto considered the offer. It hadn’t been very long since Izuku had done that for the first time, and while it was swiftly becoming one of Shouto’s favorite activities, the process of working up to it, especially with Izuku’s size, was still rather… involved. Shouto wasn’t sure how exactly this was going to go, but he didn’t think he wanted to add all that on top of everything else. 

Slowly, shook his head. Then, reconsidering the actual wording of the question, Shouto clarified, “Not that way, at least.” His voice caught a bit as he remembered exactly how Izuku might ‘fuck’ him without any penetration at all. Izuku’s eyes flicked down to Shouto’s fidgeting lap, and his mouth quirked up in a knowing smile. 

“Understood, darling. I’ll keep that in mind,” Izuku assured him, with only a slight edge of throatiness to expose his own want. “Katsuki, baby, are you okay with our usual safety measures, or do you need something different?” 

“No, no, I’m good with the usual shit.” Katsuki’s words practically tripped over themselves on the way out in their hurry. It was unexpectedly charming, and Shouto laughed quietly. Izuku seemed similarly taken with Katsuki’s blatant eagerness, smiling broadly in response. 

That smile turned sharper, followed by a wickedly enticing sideways look toward Shouto. “Shou, love, could you help me get Kacchan undressed, please?” Izuku asked, the grit from before smoothing out into a syrupy siren’s call. Shouto heeded that call without a second of hesitation, moving to unbutton Katsuki’s shirt without a word. Meanwhile, Izuku’s hands went down to undo his trousers. 

Katsuki caught on quickly, squirming to work the waistband of his pants down out from under him. Shouto took great delight in brushing his fingers over the exposed skin of his chest as he opened Katsuki’s shirt and worked it off of his wide shoulders. Each touch was chased by little shivers that were incredibly satisfying. 

At some point, Izuku had gotten down on his knees, presumably to get Katsuki’s pants the rest of the way off. He seemed to have gotten a bit sidetracked, though, because he was currently holding up a pair of briefs. There was… a sizeable wet spot on them, glinting slightly in the center with something sticky. Shouto was a bit confused, but he had to admit that the bright pink that Katsuki’s cheeks turned was definitely a positive.

Before Shouto could even begin parsing through the implications, Izuku said, deep as a panther’s purr, “Oh, baby. You must have been really excited for this.” His tone curled into that indulgent, half-mocking pout that he sometimes turned on Katsuki. “Was it hard, not squirming in your seat, sweetheart?” 

Shouto watched as Katsuki’s pupils blew open, his throat bobbing with an affected swallow. He wasn’t sure the blond was even aware of the slow, spell-bound nod he made, but Shouto didn’t doubt the truth of it. 

“You did a great job, baby,” Izuku complimented, voice sticky-sweet. “I was sitting right behind you and I didn’t even notice.” 

Katsuki, predictably, puffed up at the praise, soaking up the words like a soft sponge. Shouto barely had time to process how- how cute Katsuki was, when Izuku’s tone shifted back to the rumbling, predatory timbre from before. “I’m not sure I could have made it through class if I had known how worked up you were. Might have dragged you out to the bathroom in front of everyone and fucked you full then and there.” 

Katsuki’s cock twitched visibly, and Shouto wasn’t faring much better. Heat from his quirk rose instinctively, and he scrambled to tamp it back down. He’d had quite a bit of practice recently, but he was still learning how to keep his quirk in hand through the spikes of lust he was now exposed to regularly. There was no way the image of Izuku, overcome with want, stealing Katsuki in broad daylight to fuck him silly, wouldn’t trigger one such spike, but Shouto rode it out the best he could. 

Izuku wasn’t done, though. Tinged with a saccharine, false pity, he continued. “And then poor Shouchan would have been left behind, having to sit there knowing exactly what we were doing, and not even getting to watch.” The fact that Izuku thought to place Shouto in the little scene he painted was surprising enough, but the genuine consternation on Katsuki’s face at his imagined self’s predicament made something in Shouto’s chest melt. 

He was pretty sure that if he were ever actually in that position, Shouto would be far from complaining, and that was if he didn’t just run after them and damn the consequences. Still, when Katsuki reached out to him beseechingly, Shouto went easily into the kiss, sweet and warm as a fresh pastry. 

When Shouto finally pulled back, he saw that Izuku was back on his feet. With a casually proprietary gesture, he dragged his fingers through Katsuki’s hair, cupping the back of his head to redirect his attention up to Izuku. “Okay, love. Now,” he said before swooping in to steal a kiss of his own, “could my baby please go get cleaned up for me?” Katsuki’s nod was more hesitant this time, and Izuku switched from cajoling to reassuring. “I’m just going to ask Shou some questions and remind him of our rules. I promise we won’t start without you, baby.” 

The storm cleared from Katsuki’s brow. He sighed and levered himself up with his usual feline grace still mostly intact, despite his total nakedness and arousal. Shouto watched his backside shamelessly as he walked away, and with the way Katsuki turned to him and winked, he knew it. Izuku sat down next to him, and there was a reflexive nervousness at ogling his boyfriend in plain sight. The bright smile he received quickly reminded him that behavior was not only accepted but actively encouraged now. 

Still, the frisson of fear had been enough to clear some of the lustful fog that was gathering around the edges of his thoughts. He hastily rearranged himself to alleviate the biting pinch of his zipper and make his still-clothed arousal less obvious. Clearing his throat, Shouto prompted, “You said you had questions for me?” 

Izuku hummed in acknowledgement. “I do. But first, could I get a kiss?” 

Shouto blinked in surprise at the light-hearted request, but he had yet to deny a single thing Izuku had asked of him, and he wasn’t about to start now. He sank willingly into Izuku’s soft, wide mouth, curling his arms around his waist to rest. Izuku, in turn, raised his arms, first to caress Shouto’s cheeks with his thumbs, and then to lay his elbows on Shouto’s shoulders in a loose embrace. 

Shouto had assumed the kiss would be a quick thing, a small gesture of affection before getting back to the topic, but Izuku apparently had a different idea, holding him close and caressing with teeth and tongue until Shouto felt thoroughly ravished. Only when he had left him with half-lidded eyes and ragged breathing did Izuku pull away. He made a contented noise in the back of his throat like he did after a good meal, making Shouto blush further than he already was. 

“Better,” he declared with satisfied smugness, still holding Shouto close. “Now, honey: how are you feeling about our plans for tonight?” 

Shouto held in a sigh at the question, which was quickly becoming routine. Trying to describe his own feelings about anything was still a struggle, but at least Izuku had stopped leading with the even more nebulous ‘How are you feeling right now?’ “Good. Curious.” After some hesitation, he added, “A little nervous.” 

Izuku’s expression softened. “That’s understandable. This is the first time all three of us are trying something new together. Is it just that, or was there something else worrying you?” 

Shouto took his time getting the right words together. “I am not sure where my role is in this. Or where you both want me to be.” 

Izuku tilted his head again, and Shouto fought the urge to curl up and hide away from those prying eyes. Assertiveness in the face of uncertainty was something he still struggled with, despite how often he berated himself for that. “Well,” Izuku said simply, “I think the most important thing is where you want to be. But if you want to know my preference, I’d like to be in charge of this, but I’m equally happy to have you down with Kacchan or even under him if he’s up for that, or have you be my support while we both focus on him if you’d prefer.” 

Something was settling about Shouto having his options laid out for him so succinctly. The firm knowledge that Izuku was indeed leading right now helped, too. He’d mostly known that already, but even so, the certainty gave him enough stability to gain some footing. 

Shouto had learned in the last few weeks that as long as Izuku was able to be upright, he loved having Shouto drape himself all over him, and so he took full advantage of that knowledge. Shouto turned away and flopped back lazily, resting his head back on Izuku’s chest and letting his spine curl and melt over his lap. If he craned his neck, he could even look up at the besotted smile Izuku gave him for his boldness. 

“Hi there, love,” Izuku said dopily before gathering Shouto’s limp upper body up in his arms, hefting him closer, and adjusting them both to be more comfortable. Shouto sighed and relaxed further into the embrace, taking comfort in the surrounding touch. The feeling of being held in those strong arms had yet to get old, and he basked in it for a bit. He was sure there were other things they needed to talk about, but the prospect was much less daunting when he was being held like this. 

Izuku kissed the top of his head and then went on with the ‘briefing’. “Just to be extra clear, when you said ‘Not that way,’ did you mean you didn’t want anything penetrative at all?” 

Shouto nodded. “Not today. Too much work,” he clarified. (Just in case Izuku somehow thought it had anything to do with the whole ‘Daddy’ thing itself. Katsuki had made enough ‘daddy issues’ comments under his breath for Shouto to be aware of some of the more unfortunate assumptions they might make.) 

Izuku chuckled and ran his palm in long strokes over Shouto’s exposed belly. “It should surprise me more how much of a lazy cat you can be like this, but it suits you somehow,” he said indulgently. 

Shouto chose to take that as a compliment. He had certainly liked the cats in cafes who liked to snuggle against him. (From how they congregated on his left, it was probably just because they liked the warmth, but Shouto wasn’t above using his advantage to claim more of the purring furballs, especially when it made Shinsou glare and Katsuki rile himself up in a competitive fervor.) 

Izuku hummed thoughtfully. “I was hoping to get my mouth on you tonight. If you’re not up for it, I have plenty of other ideas, but if you are, you would still need to do the cleanup part at least.” 

Shouto flushed at the suggestion, and he bit his lip, torn. “You don’t have to decide yet,” Izuku offered. “We’ll probably take a break at some point, and you could clean up then if you want.” 

Shouto took him up on that compromise with an agreeing hum. “It’s a deal, then,” Izuku said, satisfied. 

“As for safety, do you want to use your colors?” Shouto, through some trial and error, had found that it was much easier to reach for ‘red’, ‘yellow’, and ‘green’ than it was to say ‘stop’, ‘wait’, and ‘go ahead’, especially when he was ‘floaty,’ as they referred to it. He wasn’t sure why that was, but reasons wouldn’t change the fact of it. Izuku had only put up a bit of initial resistance at first, but having the former didn’t have to mean they were disregarding the latter, and as soon as Shouto agreed that it was only an addition, not a replacement, it had been neatly slotted into Izuku’s habit of ‘briefings’ as part of their safety plan. 

Shouto agreed with the familiar suggestion, and to using snaps as a signal to check in when Izuku added it. Tapping out, Shouto had learned, was a universal signal with Izuku and Katsuki, in place at all times and instinctive enough not to need a habitual reminder, but he silently tacked it onto his mental list. 

More cautiously, Izuku brought up his last point. “I also- well, I was wondering if… It seemed to me like you were more ambivalent about the whole ‘Daddy’ idea than Katsuki.” He didn’t phrase it like a question, but he seemed to be looking for an answer anyway. Shouto shrugged and nodded slightly. It was a fair assessment. 

“That’s just fine with me, love. But I wanted to offer… Well, if it feels right, you could always call me ‘sir’ instead. If you want,” Izuku explained, his tone unaccountably nervous. Still, the idea sent a frisson of something up Shouto’s spine, making his eyelids flutter with it. He let out a low groan, barely stifled behind his teeth. 

Izuku definitely heard it anyway, judging by the stiffening hardness Shouto felt against his spine. Izuku responded with a relieved sigh. “I take it you liked that idea?” he teased, his voice dipping back into that confident smoothness. Shouto nodded, unable to even pretend he was unaffected. “Good,” Izuku said, nuzzling his cheek into Shouto’s hair. “I still want to hear you call me Daddy at least once while you’re in subspace, though,” he whispered. “If you don’t like it, we can drop it, but could my sweet boy try, at least once? For me?” 

Shouto had been planning to anyway, so the overkill was almost insulting, or at least it might have been if Shouto’s thoughts hadn’t turned to soup from the combination of Izuku’s seductive words in his ears and the realization that he actively Wanted this, maybe even as much as Katsuki did. His responding “Yeah” was breathy and brimming with provoked lust that disguised his surprised awe at having inadvertently given both of his partners this opportunity. 

Needing more of a physical outlet, he flipped over, crawling into his lap as much as he could as he mouthed at Izuku’s neck. Izuku let out a smug hum at the treatment, holding Shouto close and tilting his chin to give him more access. “My sweet boy,” he crooned happily. Shouto kept it up until Izuku gently tapped his side, alerting him that Katsuki was coming back soon. Not unkindly, Izuku lifted Shouto off his lap and set him to the side.

He stroked Shouto’s hair and pressed a grateful kiss to his forehead. “Alright, honey, it’s time. I’m going to put Katsuki in headspace first. Do you want to join in once I’m done, or would you like to sit back and watch for a bit first?” 

Shouto considered his options. “Can I… help? Somehow?” he asked. 

Izuku smiled. “I think I can figure something out, yeah. You want to just be my helper for now, or is this part of being my sweet boy?” he asked with a casually affectionate swipe at the corner of Shouto’s mouth, clearing away the slight mess he’d made with his sloppy kissing. 

The casual parental gesture did something to Shouto, shifting his headspace softer and a bit to the left, reminding him of his initial assessment about Izuku’s leadership style at lunch. Huh. Maybe calling Izuku ‘Daddy’ didn’t just make sense for Katsuki. 

Before, he might have been unsure, but now Shouto replied firmly, “Your sweet boy.” 

Izuku’s eyes widened at the confirmation, but the reaction seemed like a happy one. “Alright, then. Be good and sit still for a bit, and I’ll let you know how you can help soon,” he instructed just as padding steps approached. Instead of pulling away from him, though, he planted a lingering kiss on Shouto’s cheek, not ending it until Katsuki had certainly seen the gesture. Only then did Izuku turn to look at the blond, his skin still dewy and flushed from the hot water. 

Green eyes scanned over Katsuki appreciatively, and Shouto was helpless to follow (not that he tried very hard to resist). He was gorgeous, and Shouto was still reveling in the fact that he got to see him like this, naked and unashamed. As subtly as he could, he activated his ice to cool the blood rushing to certain areas. He wanted to at least try to stay collected long enough to assist in the way that he had offered to Izuku. 

“Come here, baby, I want to give you a kiss, too,” Izuku crooned with a coaxing crook of his fingers. In a few quick strides, Katsuki had crossed the room, but before he could even fully bend down to receive the promised affection, Izuku grabbed a thick handful of his hair and pulled him down to meet Izuku’s lips. 

It caused Katsuki to stoop awkwardly for a few moments, but, in a masterful set of maneuvers that Shouto could only watch with awed respect, Izuku stroked his thighs and guided Katsuki into straddling his lap, while never faltering for a moment in what looked to be a devastating kiss. When Izuku finally pulled away, Katsuki’s eyes blinked open hazily, and the rumbly, drawled “Good boy,” that followed had his expression going slack with overwhelmed pleasure. 

Shouto was sure he’d be the same if he were under the same sort of targeted assault, especially since it seemed like only the beginning on Izuku’s part. There was an odd sort of sympathy in that, or would that be empathy? Either way, it was a fascinating thing to watch him lead their dance so skillfully. 

Just as it looked like Katsuki was rallying to pour his energy into the kiss, Izuku tapered off and pulled away, leaving the other boy grasping for more, getting only a gentle, soundless shushing in return. Izuku smiled softly up at the agitated boy perched above him innocently, like he hadn’t just effortlessly wound Katsuki around his finger. “Hello, baby,” he greeted, his voice sticky with affection. “Are you excited for this?” 

Katsuki reared back with an affronted look that had Shouto fighting a chuckle. To be fair, it was blatantly obvious what the answer was with how ramped up Katsuki was already, not to mention what had happened already before he left. The blond scoffed, and rather than answering with words, he ground down on Izuku’s lap and asked, “What do you think, Deku?” 

Izuku hummed thoughtfully, giving no sign that he was affected by Katsuki’s rolling hips. “I think… that that’s not the name you want to call me right now, is it?” Izuku asked, a thread of steel weaving its way through the softness of his tone. His hands curled over Katsuki’s hips, and the undulating motion of them stopped abruptly and involuntarily. 

With a sense of awe, Shouto looked at Izuku’s arms and saw no sign of strain, with only a slight tension to indicate that he was expending any effort at all to hold Katsuki still. This was despite the fact that Shouto was breathlessly watching the man in his hold squirming with all his strength against the grip. After a few moments of struggling, Katsuki with a horny, and just a touch plaintive, whine. “Izu, fuck, come on,” he entreated, already several degrees more conciliatory than when they had started. 

“Hmm. Better, though not quite what I had in mind,” Izuku said lightly. With just a hint of that babying tone, he asked with false concern, “What’s wrong, sweetheart, are you feeling shy?” 

Katsuki’s face screwed up into a disbelieving scowl. “No, I’m not fucking shy! I just-” He was cut off by Izuku yanking at the back of his hair, forcing his chin up and chest out in a stunningly erotic display. Katsuki gasped, cursing in surprise. 

Izuku gave a small, self-satisfied smile at the reaction. “Ah, I understand now. My pretty baby needs some help getting down before he can be Good for me like he wants, isn’t that right?” he cooed, holding Katsuki while he writhed in his lap. His lips fell open, and a moan fell out of them, spilling like a mouthful of water into the space between them. Katsuki stiffened at the accusation, but rather than denying it, he relaxed into Izuku’s hands with a shudder. 

Shouto let out a breath of awed relief, and it was only then that he noticed that he had been holding it for so long. He watched rapturously as Izuku’s hands shifted to support rather than restrain the boy in his arms. “That’s it, sweetheart, just like that,” Izuku called smoothly, all trace of mockery washed out in a wave of adoration. “Look at you, baby, you’re being so good for me, letting me hold you. Come here, pretty boy, let me kiss you.” 

Katsuki seemed to turn to liquid under the flood of sweet words, following Izuku’s guiding hands into a slow, seductive kiss. By the time he was done, Katsuki was a dazed mess, and honestly, Shouto wasn’t much better. His jaw had dropped open at some point, and he had to swallow heavily to avoid embarrassing himself from how much his mouth was watering. 

“Now,” Izuku breathed, “will my baby boy tell me what he wants first? Anything you want, love, we’ve got all night.” 

Katsuki’s voice, when it came, was throaty and wavering. “Wan- Wanna suck you.” The dry rasp in his words only accentuated the luridness of the request.

Shouto was expecting Izuku to do what he normally did when either of them had made a request like that and agree immediately, so it was a bit of a shock when Izuku instead hesitated, angling his head like he was listening to some far-off sound. He tilted Katsuki’s chin gently upward with a curled finger. “Is that all, or did you want to ask for something like a Good Boy?” he asked enticingly, and now Shouto could see the shape of the game Izuku was playing. 

Sure enough, whatever flimsy resistance Katsuki had mustered crumbled with a whine that sounded like it was pulled directly from the center of him. “Please, Daddy, fuck my mouth. Wanna be Good.” 

Despite knowing what was coming, Shouto still gasped at the sheer intensity of want that rushed through him from hearing Katsuki beg like that, the pout of it creating a hint of a lisp, like a child begging for a sweet. Izuku was similarly affected, judging by the way he shuddered and bent to kiss Katsuki like a man starving. “Fuck, baby. So Good for me,” Izuku said in a strained half-murmur. “Yeah, I’ll fill that pretty mouth of yours as much as you want. Want to spoil you rotten, sweetheart.” 

He’d known, intellectually, that Izuku was extremely persuasive and that if necessary, he could use that talent on his partners, Katsuki especially, with how deeply they knew each other. He’d seen minor examples even before he’d been extended the privilege of being invited into their intimate activities, but that was a far cry from seeing… this. This effortlessly deft, benevolent manipulation that turned a fierce, sharp-edged fighter into putty in Izuku’s hands in a matter of minutes. 

From anyone else, it would have made Shouto wary and guarded to see such a strong will so easily subverted, if only to protect his own closely held autonomy. But, knowing that it was Izuku enacting it, all Shouto felt was awe and a soft longing to be similarly shaped under those sculptor’s hands. He could be patient, though, especially when the reward was getting to see Katsuki come undone right in front of him, and potentially even contribute to that undoing. 

As if Izuku had heard Shouto’s besotted thoughts, he turned and smiled at him, bringing him from the audience back into the tableau. “We’re going to take such good care of you, aren’t we, sweet boy?” Shouto nodded dutifully, squaring his shoulders to ready himself for whatever task Izuku might ask of him. 

The warmth in those green eyes was enough to make the heat bloom in Shouto’s cheeks. “Could you please go get a cushion for Katsuki, honey? He looks so pretty on his knees, after all,” Izuku purred, his eyes going half-lidded. Electric sparks danced up Shouto’s spine, and he quickly moved to fulfill his request. 

As soon as the seat cushion was placed in the designated spot, Katsuki scrambled down from his perch, hurrying to get his promised reward. Just as clever fingers darted for Izuku’s zipper, though, they were caught and held at bay. “Hold on, baby. First, Shouchan, could you come sit behind me?” 

Shouto was thrown for only a second before he fully processed the words and gladly climbed back onto the bed and wrapped himself around Izuku like clinging ivy. Izuku leaned back slightly into Shouto’s embrace in obvious appreciation. Turning his head, Izuku gave him a quick peck on the cheek that, absurdly, made Shouto blush. “Kacchan, sweetheart, could you clear your palms for me, please? Quick is good, but quiet is better.” 

Izuku released his hands, and there was a gentle crackling sound as Katsuki fired off the explosive sweat that had evidently been gathering on his hands, while he in turn dipped two fingers into Katsuki’s mouth, which he seemed happy to suck on. “Honey, could you please help me with my buttons? Our hands are a bit occupied at the moment,” Izuku explained, voice tinged with amusement. 

Somehow, even though they had literally just talked about it, Shouto was unprepared for how satisfying it felt to be relied on like that. An involuntary pleased noise rumbled in Shouto’s chest at the idea of finally being able to touch, and he got to work freeing Izuku’s gradually hardening cock from its confines. (And if his fingers lingered on the still-malleable warmth there as he did, well, Izuku didn’t seem to mind one bit.) 

Shouto startled when, as soon as the firecracker hiss died down, he felt near-scalding hot hands clutch the tops of his thighs. Only a second later, Katsuki’s mouth was freed, and he darted forward, swallowing down the half-hard length that Shouto had been holding in one smooth motion. Both he and Izuku gasped at the respective stimuli, and Katsuki moaned in return, the sound only slightly muffled by the fullness of his mouth. 

Izuku groaned appreciatively, throwing his head back against Shouto’s shoulder at the sudden onslaught of sensation. Needing to do Something to channel the want coursing through him, Shouto turned his attention to unfastening the row of shirt buttons above where Katsuki had nestled himself, greedily keeping the whole of Izuku between his pretty lips. 

“Oh, good boy,” Izuku praised, and Shouto was genuinely unsure which of them he meant. Either way, it made his scalp tingle pleasantly, so he concentrated on getting the last of the fiddly little buttons loose. 

He was so focused on his task that he almost didn’t register the wet clicking noises when they started. Almost. Letting his hands go on autopilot, he leaned further over Izuku’s shoulder to investigate the source of the sound. 

Below, Katsuki’s red eyes looked up at them, wet and hazy, as he visibly struggled to swallow. Izuku’s hands were firmly knotted in that spiky blond hair and holding him down. Arousal flared in Shouto at the sight, but so did concern. He knew Izuku would never intentionally do anything to hurt Katsuki, but he’d also never seen the hypercompetent boy have so much trouble, or fight against Izuku’s hold like that. 

Remembering that Katsuki was still clinging to his thighs and not Izuku’s, Shouto tapped Katsuki’s wrist in a silent check-in, the same way they had done for him so often. The hand that he touched immediately let go, but rather than snapping or tapping out, he clutched at Shouto’s hand with a desperate grip, the pressure tightening in time with his loud, gulping sniffs. Shouto squeezed back, hoping it might help, and, miraculously, Katsuki seemed to relax in response, going boneless under their hold. 

“Good job, baby, you did so good,” Izuku crooned. “I knew you could do it, Katsuki. I’m so proud of you, baby boy, you’re amazing. Just a little longer, sweetheart, and then I’ll let you up. So Good for me, my baby, so precious.” Katsuki sobbed at that, and the tears in his eyes finally spilled over. 

Shouto squeezed his hand again, and Katsuki shifted his gaze over from Izuku to him, staring straight back with a vulnerability that cut. With his free hand, Shouto reached down and, as tenderly as he could manage, thumbed the wetness from his cheek. Katsuki closed his eyes and leaned into the touch as much as he could from his position. 

The trust and care in that little gesture almost broke Shouto, and he pressed his mouth to the crook of Izuku’s neck in an attempt to calm himself. Izuku leaned his jaw into him with a sympathetic noise. “It’s okay, sweet boy, I’ve got him, I promise,” he murmured soothingly. A nameless Need rose in Shouto and, trying to sate it, he took advantage of Izuku’s open shirt to clutch at his waist with his still tear-soaked hand. 

The skin-to-skin contact, along with Izuku’s bulky solidity, helped, but his breath still came shakily, and the small tremors that had started in that hand spread. The worst part was that Shouto had no idea why. He gritted his teeth against the feeling, determined not to break down for no good reason when he was needed. 

Shouto wasn’t sure how long his eyes were closed, but they blinked open at the small but insistent tugging on the hand linked with Katsuki’s. The boy in question was now peacefully mouthing at Izuku’s tip, but when Shouto let himself be pulled, he turned away briefly to kiss the back of his captured hand. 

Shouto sucked in an affected breath, but Katsuki wasn’t done. He went back to his assigned task, but not before placing Shouto’s hand in his hair, right above where Izuku still held him. Izuku, in turn, shifted his hold so that Shouto’s hand fell beneath his, and their fingers slotted together in a clear gesture of support. 

With that tacit permission, the tangle of mysterious emotions in Shouto’s chest finally resolved itself into a neat braid of protectiveness, longing, and loneliness that bound him tightly to the two beautiful people who had miraculously allowed him to not just witness but participate in their love-soaked rituals. His grip tightened greedily, and for some mystifying reason, both Katsuki and Izuku followed the movement. 

Izuku sighed in pleasure as Katsuki took him deeper under Shouto’s guiding hand. His face turned, and Shouto felt questing lips and nipping teeth at his ear. “So good to me, love,” Izuku whispered, stroking his thumb over Shouto’s knuckle. “Make us both feel good, won’t you, baby? I know you want to. I trust you, sweet boy.” 

Oh. Shouto swallowed against the lump in his throat and focused his gaze on Katsuki. He looked right back, and seeing the question in his eyes, answered with a single long blink, languid and somehow fond. Shouto took a fortifying breath. Then, gently, he began to tug Katsuki forward with small, rocking pulses. He had no real idea what he was doing, so he leaned into intuition, building a steady rhythm under his palm. 

Soon, he heard Izuku’s breath hitch, and he chased that signal as well as he could. He moved Katsuki in perfect counterpoint to the waves of tension he could feel ripple through Izuku’s abdominals, gradually growing bolder until he could hear the sound of him hitting the back of Katsuki’s throat with each thrust. 

The first time he heard something like a choke, Shouto hesitated. Izuku kindly but firmly pressed on his hand, and Katsuki moaned when Shouto resumed the pressure, pressing deeper once more. Gradually, he built confidence until he was shoving Katsuki down almost all the way on each thrust. Katsuki looked utterly blissed out under the rough treatment, and Shouto was soon feeling almost centered after that odd bout of off-balanced emotion. 

…That was, until Izuku started to speak again. 

“Look at you, sweetheart, so fucking pretty for me. Both of my boys are treating me so well. Feels so good, love, can’t get enough of your mouth. I’d say you’re spoiling me, but I think we both know who’s really getting spoiled here. Shouto’s being so nice to you, isn’t he, baby? Fucking your face all sweet like that, without even getting to feel my baby boy’s slutty throat,” Izuku tutted, more of that pouty mockery leaking in with every word. “Do you want to show him how Good my gorgeous, slutty baby boy can be?” 

At that, Katsuki moaned loudly, his eyes rolling up in an expression of ecstasy that stole Shouto’s breath. It took all of his concentration to keep his quirk in check and not injure either of them, and he was stripped of any defense whatsoever to the arousal that pulsed through him. “Yeah, I thought so,” Izuku said smugly. “If he’s even a little meaner to you, you’re going to come without a single touch, aren’t you, sweetheart? Do you want that?” 

Katsuki was in no shape to do their normal blink signals, but the way his hands balled to clutch and tug at Shouto’s pant leg and Izuku’s waistband made the answer glaringly obvious anyway. There was no world in which Shouto wouldn’t give either of them anything they asked for, especially not like this, but he would be lying if he said that there wasn’t a delirious joy in this particular act, in being the instrument through which Izuku broke Katsuki down into his constituent parts. 

An odd sort of glee seized Shouto as he tightened his grip on Katsuki’s hair and shortened the strokes he was directing. This way, his throat was clear for only moments at a time, and the pace grew more staccato. This had the delightful side effect of provoking a pleasured hiss from Izuku, his hips kicking up slightly to the new rhythm. 

The most wonderful part, though, was how, because Shouto was so utterly focused and attuned to Katsuki’s every small movement, he could see the moment when the wave of orgasmic pleasure hit in perfect clarity. Shouto saw Katsuki’s already flushed face darken, his brows tense and rise, his breathing falter and choke, his lashes flutter, and his jaw slacken. Izuku must have seen it too, and when his response was to hold Katsuki down and still once more, Shouto followed his lead, trusting in his extensive experience not to do more than Katsuki could handle. 

For a few seconds, Katsuki struggled against the hold, though he didn’t move his hands to try and signal to be let up. Eventually, he settled, slumping into their hold with glazed-over eyes. Only then did Izuku start to pull him off, and Shouto helped as gently as he could, concerned about Katsuki not being able to breathe. 

Sure enough, once he was able to, Katsuki heaved several large breaths, but he didn’t tense at all in their hold, so Shouto tentatively started to relax himself. It helped even more when Izuku bent over and scooped Katsuki up off the floor, gathering him firmly into the circle of both of their arms. Purely out of instinct, Shouto hugged them both and used his quirk to cool the air slightly to try to help them be more comfortable. Katsuki let out a gravelly hum of appreciation at the gesture, and Izuku gave a pleased sigh as well, so Shouto congratulated himself on the good call. 

After a few moments of rest, Izuku said in a hushed, careful tone, “Shouchan, love, you did so well. Could you go sit up by the pillows for me? I want to get Kacchan situated somewhere more comfortable. He’s more than earned it.” The last part was said more to the blond bundle in his arms than to Shouto, the words full of sticky-sweet fondness. 

Shouto was a bit reluctant to give up the embrace even temporarily, but he saw the sense in Izuku’s words, so he scooted up toward the headboard. The movements were made a bit awkward by his unwillingness to turn his eyes away from the pair, but he managed to get settled where Izuku had indicated quickly. He was rewarded with a brilliant smile, and then even more when Izuku passed over his armful of exhausted boy for Shouto to hold. 

He realized why in just a moment, because Izuku came back with a stack of cleaning rags and began to gently clean the splatter of cum off of Katsuki’s thighs and groin. Once done, Izuku situated himself to lay his full weight onto Katsuki, which also increased the pressure on Shouto’s chest in a pleasant sort of way. 

Katsuki gave a heartfelt groan of pleasure at the forcible squishing, and Shouto readily concurred. Izuku let out a deep chuckle at the reactions of the two of them. “My cute boys,” he said with deep fondness. 

Something about the simple declaration made Shouto feel so… small, like a child who was out of their depth being watched over by an indulgent parent. It wasn’t a bad feeling at all, though it was intensely vulnerable. Looking for something to anchor him, Shouto buried his face in Katsuki’s soft, poofy hair. 

“How are you feeling, baby?” Izuku asked in a gentle tone. “Are you ready for more, or do you want to take a break?” 

Rather than answer with words, Katsuki responded with what Shouto could tell, even from here, was an absolutely filthy grind against Izuku’s cock. He struggled not to laugh at the bold, unspoken demand, but Izuku had no such compunctions. A loud, joyful laugh pealed from him like the chiming of a bell, melting Shouto’s heart in an instant. “Alright, alright! Oh, baby boy, what am I going to do with you?” Izuku asked, voice slightly exasperated and soaked in fondness.  

“Fuck me?” Katsuki suggested hopefully. 

This time, Shouto joined Izuku in his laughter. It was just so… Katsuki. He didn’t seem to mind, at least, judging by the happy chirping noise he made. 

Shouto knew this was only the beginning, but he took a moment to be so, so grateful that the universe had aligned in such a way to allow him all of this. To allow him to be here, with the two men he loved, in this bubble of joy. He melted into the feeling, letting it light him up from the inside.

Chapter Text

Katsuki was basking in the early March sunshine, reveling in the first truly warm day of the year. Well, warm enough that Katsuki could sit on the concrete rooftop without immediately trying to burrow into Shouto’s warm side at least.

Not that it would be an imposition on either of their parts. Their relationship was new enough that Katsuki still reached for any excuse to share skinship. (He’d long abandoned the pretense in the face of Izuku’s shamelessness and just reached out to touch him whenever.) Shouto wasn’t even subtle about how smug he got every time one (or both) of them used him as their personal heat pack. 

Still, it was good to soak in the fresh air while they ate lunch together, sprawled out on the flat rooftop and leisurely eating from their bentos. Well, Katsuki and Shouto were, at least. Izuku had scarfed his food down so fast that Katsuki was amazed that he didn’t choke, and then flopped back and promptly fell asleep. The idiot probably stayed up too late again on a research bender and was trying to make up for it with a nap. 

With their resident chatterbox down for the count, Katsuki was filling the role by telling Shouto some story about one of the times Kirishima had dragged him into some bullshit situation. “...but I didn't think he'd really go through with that dumbass idea, so when Shitty Hair rolled up with the fucking thing tied to the roof of the car, I was like, 'Well, smack my ass and call me Daddy, I didn’t think you’d actually-'” 

Shouto, like the asshole he was, cut in to say, “I understand you wanting your ass smacked, but… I thought you were the baby, not the daddy? If anything, Izuku would be the daddy.” 

…

Katsuki had a brief moment of recalibration as he took in the latest deranged take from his himbo boyfriend. How Shouto could say that kind of shit with a straight face, Katsuki would never know. 

The predictable flare of annoyance bubbled up at the assertion that Deku was more suited to something than him. His breath caught before he could even shout more than an indignant “YOU-” before the yell was strangled in his throat, though, as his mind fully caught up with Shouto’s premise. 

Just- fucking… Daddy? Really? Sure, Katsuki had been the one to bring it up, but it was just a stupid turn of phrase. 

Intrusive imaginings of some truly depraved shit crowded his brain at the explicit association and fully knocked him out of his irritation. Heat scorched his cheeks as he realized how much he liked the idea of calling Izuku… that. 

The embarrassment tipped him past the point of control, and Katsuki could hear his palms crackling as his hold on his quirk slipped. He scrambled for something, anything, to say in response, but his mouth flapped uselessly as he tried to find an argument against that accusation.

Yes, Izuku called Katsuki ‘baby’ a lot, but he didn’t mean it that way. …Right? But before he could dig himself out of his flustered stasis, Izuku woke up. 

Great, just fucking great. 

Sure enough, Deku asked blearily, “Shou? Wha’ happened? Why’s Kacchan blushing like that?” 

As if to rub it in, his palms crackled again at the sound of Izuku’s husky, sleep-soaked voice. What the fuck? Katsuki hadn’t been this wound up about Izuku in a long time, not sure where the line was between anger and arousal.

“Well, he was telling me about a dare Kirishima did, and said, ‘Well, smack my ass and call me Daddy,’” Shouto said frankly, putting air quotes around the words. Katsuki’s gut sank as he realized he was giving Izuku the damn play-by-play. “I’m not sure exactly what that means, but I assume from context that it’s one of Tsuki’s odd idioms. So I told him that I thought he was the ‘baby’ and that if anyone was the ‘daddy,’ it would be you.” 

Izuku just laughed, with no goddamn respect for the fact that Katsuki was dying of mortification. Then he turned to look over at him with a fondly crooked smile. “Well, you are my baby. Would you like to call me that?” he asked casually. 

Wait, what? It was that easy?

Katsuki nearly had a goddamn heart attack with how quickly his heart leapt into his throat. Did he want that?

As soon as he thought it, he knew the answer was yes. But should he say that? His mind was too full of static for him to know for sure.

He stared intently at his lunch while he tried to form even one coherent thought. It sure was doing a number on him. Even approaching the thought of actually bringing the images sprouting in his mind to the light of day was like holding his finger dangerously close to a live wire, and he had no fucking idea why.

Sure, he’d made a couple of stupid raunchy jokes in his head about Shouto having daddy issues, but he’d never really considered it in the context of himself. Katsuki didn’t have that kind of damage, at least not from his dad. He was great. A bit of a pushover when it came to his mom, but his dad always took care of him, and they loved each other. 

This- this wasn’t about that, though. It didn’t feel like it had anything to do with his actual dad. It was just- the idea of Izuku in that particular flavor of authority and care… It felt right. His ‘down’ headspace had always been a bit… childish, for lack of a better word, and the idea of Izuku treating him that way, small and precious, was heady. 

The only real problem was the weird cobweb of shame the prospect seemed tangled up in. Katsuki couldn’t find a single solid reason for it, though, other than potentially alienating his partners.

“I- I don’t fucking know,” he stumbled out. “Wouldn’t that- would that be weird for you? …for either of you?” 

Katsuki needed to test the waters, to know if this was really okay, especially for Shouto. They were still figuring shit out with the three of them, and Katsuki didn’t want some dumb kink experiment more than he needed Shouto to be comfortable around them. Izuku seemed to be thinking along similar lines because he also turned to Shouto expectantly.

Shouto’s brows drew in a bit in thought. “I don’t think it’s a problem for me, no.” He shrugged and said bluntly, “If you’re worried because of my father, I’ve never called the old man that in my life. It was always ‘Father.’”

The mental image of a tiny baby Shouto saying ‘Father’ with a dead serious look on his pudgy face nearly made Katsuki let out an inappropriate laugh, but he managed to hold it in. 

“And I get it,” Shouto added thoughtfully. “Izuku is very… parental when he’s in charge. Well, what I assume good parents are like, anyway. Caring, encouraging, coddling, indulgent, teasing to embarrass… it makes sense.” 

Well, that answer was a relief, at least. As for that last part… Katsuki sort of resented the fact that he knew exactly what Shouto was talking about. He’d never quite thought about it in those terms, but as soon as it was pointed out, Katsuki couldn’t unsee it. Izuku had a very… nurturing energy, especially when Katsuki had been ‘down’ for a while.

He got a bit of a whack to the chest at the ‘well, what I assume good parents are like’ part, but now wasn’t the time for that shit, so he folded that flare of protective rage into the familiar ever-smoldering peatfire of his anger at Endeavor. Someday, he'd be able to stoke it high, but today was not that day.

A wave of curiosity took him over as he forcibly redirected his thoughts, and before Katsuki could stop himself, he asked Shouto, “So, would you want to call him that too, then?” 

White hair spilled over Shouto's shoulder as he tilted his head in thought, an intrigued look in his eyes. “Maybe? I’d be willing to try it out.” His acceptance and nonchalance eased some of the embarrassment that was still clinging to Katsuki, but, irritatingly, didn’t clear it away completely. “Is that something you’d be interested in, Izuku?”

Izuku’s cheeks pinked as both of their attentions pivoted back to him. “I- Yeah, I think I might like that. With both of you.” His eyes focused on a hazy mental distance, obviously imagining it. “I wou- I don’t know if I-” he stuttered out. “I’m not sure that I would act quite the same way that I normally do. I- Even thinking about it kind of makes me want to wrap you both in blankets and feed you snacks, but also fuck you ‘til you cry??? So it’s somewhat different than my normal headspace, I think,” he explained, hands flailing.

Katsuki was stunned, mind spinning out as his imagination tried to fill in what it would feel like to be treated that way. Holy shit. Yeah, okay, that did it for him. Huh. Another wave of heat rolled through Katsuki, but his face had been red since this conversation started, so at least his reaction might not be super obvious. 

With that latest revelation, Katsuki stubbornly resolved to go through with this, despite some dumb part of himself clinging to the idea that he should hide how much he was into this. He had to keep his mouth shut, though, because he had the insane feeling that if he spoke his decision, what would come out was ‘Please, Daddy, let me suck your cock,’ and Katsuki was still pretty sure that was too much, way too soon. 

Shit, they had to go back to fucking class in a few minutes. 

At least, judging by the pink in Shouto’s cheeks, he wasn’t opposed to Izuku's proposition either. That was confirmed when he said, his voice a little rougher than normal, “That sounds nice to me, so…” 

Okay, then. They were fucking doing this, then. Katsuki nodded firmly, cementing his agreement. 

Katsuki felt his blood fizzing with anticipation, and he started shoveling food into his mouth to tamp it down. They still had hours before they could act on any of this, and until then, he just needed to keep it together. After that, well… they would see. 

By some unspoken agreement, the three of them split up for the rest of the school day and interacted as little as possible until they were able to have some privacy again. Thankfully, none of them were on cleaning duty today, because Katsuki was already practically crawling out of his skin with anticipation by the time he made it back to his room after class was dismissed. 

They hadn’t exactly said it out loud, but his assumption that they would be meeting in his room was proven right when he came in to see Shouto already sitting stiffly on his bed. Their eyes met for half a second before Katsuki broke the connection, too overwhelmed to process eye contact right now.

It was still enough to give Katsuki a good idea of where Shouto’s mind was. He wasn’t quite as riled up as Katsuki, but he was still dealing with A Lot. He decided to make things a bit easier on both of them and silently sat down beside his boyfriend, close enough to almost touch shoulders.

Katsuki’s silent offer of support and touch was accepted immediately. Shouto leaned his weight against him and took his hand, weaving their fingers together in a desperately tight grip. Katsuki wasn’t sure what exactly was making Shouto feel so unsteady, since he wasn’t a goddamn mindreader, but it still steadied his mind to have someone physically depending on him. 

They stayed there, waiting and grounding each other, until Izuku (fucking finally) came in. Some final bit of tension let go in Katsuki’s core at the click of the lock, his instinctive wariness unwinding at the signal of true privacy. He leaned harder against Shouto to anchor himself at the sudden unmooring. 

Izuku approached them, smiling softly. “Hi, Kacchan. Hi, Shouchan,” he greeted, giving each of them a quick kiss on the cheek as he did. It was only after an awkwardly long pause that Katsuki realized at least one of them was supposed to respond. It had been a bit too long to try now, so he simply pulled Izuku down into a full, satisfying kiss. 

Izuku lingered in it for a while before pulling away to let them both breathe, though he gave up a fair bit of his air to laugh. Katsuki could tell from the sound, though, that it was more about happiness than laughing at him.

Still, Izuku decided to fucking tease him about how thirsty he was being. “Kacchan is so excited today! Does this mean you still want to try out what we talked about earlier?” 

Like the fucker didn’t already know the answer. Still, he nodded, and was gratified that Shouto matched the gesture as soon as Izuku turned to look at him. He did so with a calm steadiness that Katsuki envied. He might have believed him completely unbothered if he couldn’t feel the way the temperature of Shouto’s hand was flickering anxiously. 

Izuku’s grin grew wider at the positive response. Turning back to Katsuki, he asked, “And would you like me to fuck you today, sweetheart?” 

That sultry tone already had shivers running up Katsuki’s spine. Combined with how on edge he’d been for the last few hours, it was a hell of a drug. “Hell yes,” he blurted out. 

“And you, Shouchan?” Izuku offered archly. 

Shouto sat still, thinking for a long moment, then shook his head. “Not… that way, at least,” he clarified. Katsuki wasn’t quite sure what he was getting at until he saw how Shouto was squirming and rubbing his thighs together. 

Oh, fuck, that would be hot. Katsuki remembered vividly their first night together in bed. How it looked when Izuku started fucking between Shouto’s crossed legs. If he got a repeat of that show today, when he was already so keyed up, Katsuki might fucking die. It’d be a hell of a way to go, though. 

“Understood, darling. I’ll keep that in mind.” Izuku’s acknowledgement was obviously aiming for calm and collected, but Katsuki could hear the horny longing just under the surface. Oh, good, Deku had picked up what Shouto was putting down, too. Fuck, this was gonna be one hell of a night. 

“Katsuki, baby, are you okay with our usual safety measures, or do you need something different?” Izuku checked, and Katsuki hurried to say he was good with their normal rules: listen when someone says to stop or wait, say or snap if they need a check-in, check-ins before new or dicey shit, and standard boundaries for anything physical. 

Ice Prince over there was fucking laughing at him for how fast he answered, but at this point, Katsuki didn’t give a shit anymore. He wasn’t desperate, not yet, but he wasn’t far off, and he wanted to get the ball rolling on this before something even more embarrassing happened. 

(And, well, even if it was at him, Katsuki still felt a kernel of pride in his chest whenever he heard the fucker laugh. It had started as soon as he noticed how much more often it happened since he and Izuku got their shit together and asked him out. Shouto smiled and laughed, like... measurably more now, and not just in private either. The only thing that had changed was them, so Katsuki counted it as a win.) 

Speaking of Shouto, Izuku decided to aim some lethal bedroom eyes at the sucker before saying, as seductively as he could manage, “Shou, love, could you help me get Kacchan undressed, please?” The poor idiot never stood a chance, and for what? Shouto already took just about any excuse to get Katsuki naked anyway, so Izuku was just showing off at that point.  

Still, he wasn’t going to complain, not when he had two sets of hands stripping him down. Shouto had gone for the shirt, while Izuku was working on his pants. Katsuki did what he could to help, which was mostly picking his ass up off the bed so Izuku could peel the damn things off of him. 

His attention ended up bouncing between the light, teasing touches Shouto was absolutely doing on purpose while ostensibly taking off his damn shirt, and how Izuku was gently taking his socks off. (Which... he now realized he had totally forgotten to do. Damn, his head was in the fucking clouds today. His pride was a little assuaged when he looked and saw that Shouto had done the same fucking thing, but still, that was basic shit.)

Just as he thought they were done, though, Izuku stopped and stared at the underwear in his hands, then held them up to show Katsuki. With a hot flush of shame, he saw that there was an obvious wet spot in the front.

He knew that he’d been revved up for… most of the time since they’d brought this up, but he hadn’t realized he’d been leaking so goddamn much. Well, that was fucking embarrassing. Of course, Izuku wasn’t going to let him off the hook (not that Katsuki was sure he even wanted him to).

“Oh, baby,” he crooned, with that half-mocking tone that always made the hairs on the back of Katsuki's neck stand up. “You must have been real excited for this. Was it hard, not squirming in your seat, sweetheart?” 

The worst part was that it was fucking true. It had been a long day of clamping down on any reaction to the fantasies that would not pipe the fuck down, no matter how much he tried to concentrate on school. He’d spent at least half his brainpower after lunch figuring out how to keep it from being obvious that he was sporting a perpetual half-chub that just wouldn’t go away. 

Dark pupils watched him like they could see all of it, and without a conscious thought, Katsuki nodded, helpless to the gravity well of Izuku’s gaze. He was rewarded with green eyes softening like butter in the sun, and, even better, praise for his efforts. “You did a great job, baby. I was sitting right behind you and I didn’t even notice.” 

Katsuki’s chest swelled at the acknowledgement of his effort. He was so caught up in congratulating himself for that victory that he was caught blindsided by the dangerous dip in Izuku’s tone when he said, “I’m not sure I could have made it through class if I had known how worked up you were.”

That wide smile grew sharp and wicked, and Katsuki knew he was in for it now. “I might have dragged you out to the bathroom in front of everyone and fucked you full then and there,” Izuku purred deviously.

Oh, fuck. Katsuki wanted that to have happened so damn much. He might fucking faint if the blood in his brain rushed to his dick any faster.

His whole thought process was overtaken with thoughts of being railed against the bathroom tile, barely stretched before Izuku couldn’t take it anymore, lost patience, and shoved his huge fucking cock into him where anyone could see and could definitely hear. Maybe he’d even pull Katsuki’s hair while he did it. Maybe Izuku would make Katsuki say… the Thing, do his fucking best to get him to be loud about it, too.

Katsuki’s breathing went ragged at the thought. Utterly transfixed, Izuku’s sad pout hit him like a knee to the stomach. “And then poor Shouchan would have been left behind,” he lamented, “having to sit there knowing exactly what we were doing, and not even getting to watch.” 

Katsuki knew Izuku was teasing, but there was a real moment of chagrin as he realized he hadn’t even thought about what Shouto might think about that little fantasy. Hell, enthralled as he was by Izuku, Katsuki had halfway forgotten he was here. 

His heart lurched, and he instinctively reached out to his other partner, wanting to be held so he wouldn’t forget again. Maybe later, he could be embarrassed at the way the gesture came out as grasping hands stretched out like a toddler wanting to be picked up. For now, the important thing was that Shouto came closer, giving him a sweetly shy smile at the attention. 

Katsuki pulled him in to kiss it off his face the second that Shouto got in grabbing range. The smile didn’t go away but rather grew wider despite that, so it was a bit messy, but Katsuki was satisfied that he got his point across. As if in reward, once the kiss ended, Izuku carded his fingers through Katsuki’s hair, subtly guiding his head to look up at him. 

(And it was up. Izuku had gotten to his feet while he was still sitting, and the height differential from Katsuki sitting on the bed might be making him feel some type of way, but he wasn’t going to admit that.)

“Okay, love,” Izuku started, and then claimed his own quick kiss before saying, “Now, could my baby please go get cleaned up for me?” 

Oh, right. Yeah, that was probably a good idea. He still didn’t feel great about having to leave the two of them to go do it, though.

Some of that reluctance must have shown on his face, because Izuku kindly told him, “I’m just going to ask Shou some questions and remind him of our rules. I promise we won’t start without you, baby.” 

Katsuki ruthlessly stifled the relieved sigh that wanted to escape him. He was a selfish bastard at his core, and with as scraped raw as he already felt, he didn’t know if he would have been able to handle missing out on any of their attention right now, even to each other. That might be shitty of him, but there it was. 

Shouto’s blatant staring at his ass as he walked away helped with the feeling, too. It was always nice to be appreciated. 

It took some concentration to get his ass cleaned up (and out) when Katsuki was this keyed up, but he fucking managed it. He didn’t bother wearing the towel out when he was just going to be naked again, though. 

When he stepped out, he physically could not stop the smug smirk on his face at Shouto using his little ice trick to cool himself down, just from the view. (Ever since he’d learned that Shouto was doing that, Katsuki had been keeping an eye out for it, and by now he was confident that he could spot his tells with decent accuracy.) 

True to his word, Izuku and Shouto were still fully dressed and relatively put together, with Izuku giving him a chaste kiss on the cheek. Shou’s lips looked swollen, though, so Katsuki doubted that had been the only kind of kiss they exchanged while he was gone. The thought didn’t bother him nearly so much now that he was less floaty, though, thankfully. 

Any remaining little barbs of jealousy were cleared away entirely when Izuku greeted him with, “Come here, baby, I want to give you a kiss, too,” and then proceeded to pull him into a gloriously filthy kiss. Before Katsuki knew it, he was being drawn in to straddle Izuku’s lap with nothing but light caresses and his own horniness. 

Despite the sly maneuvering, Katsuki wasn’t complaining in the slightest about the position he was in. Well, he did have one complaint, and it was that Izuku was still dressed, with uncomfortably stiff fabric that wasn’t nearly as good to sit on as bare, freckled skin. Still, the sinful way Izuku said, “Good boy,” was well worth the Bad Texture, at least for now. 

They dived right back into the kiss, but just as Katsuki was starting to find his rhythm enough not to just be carried away in Izuku’s current, he pulled away with barely a warning. It had Katsuki practically vibrating out of his skin, but Izuku just shushed him like a skittish horse until he was able to calm down a bit. 

“Hello, baby,” he said fondly, as if he hadn’t just gotten Katsuki halfway to floating with just a kiss. “Are you excited for this?” 

This. Motherfucker. Was he determined to straight-up drive Katsuki insane? And he was goddamn gloating about it, too.

Feeling vindictive, Katsuki pressed his ass to Izuku’s cock hard, hopefully making his stupid zipper bite into the sensitive skin. It was frustratingly ineffective, even though he knew Izuku’s masochistic ass was going commando right now. Still, Katsuki summoned his pride and said with as much sarcasm as he could muster, “What do you think, Deku?” 

“Hmm,” Izuku replied, like the asshole he was. “I think…” Suddenly, the hands on his hips went from lightly resting to iron clamps, stopping Katsuki in his tracks. “...that that’s not the name you want to call me right now, is it?”

The edge of sternness in the words sent shivers up his spine. His arousal flared, and Katsuki’s struggles became less about revenge and more about getting some stimulation for his rapidly hardening cock. It didn’t matter how much he flailed and pushed against Izuku’s grip, though. His hold was implacable and so. fucking. strong that it was winding Katsuki up even more.

In a matter of seconds, it became too much. “Izu, fuck, come on,” he said with an embarrassingly pathetic whine, but Izuku’s hands didn’t budge. 

In an infuriatingly casual tone, he hummed consideringly and said, “Better, though not quite what I had in mind.” Not what he had in mind?! What the fuck did Izuku want him to say, th- 

Oh. He wanted Katsuki to say the Thing, didn’t he? Holy shit, they were really doing this.

Somehow, even with everything that had happened, it still didn’t feel quite real. He could barely touch the thought in his own head without feeling like he’d brushed up against an electric fence, and Izuku was expecting Katsuki to just come right out and say it? 

As if on cue, Izuku asked with mocking concern, “What’s wrong, sweetheart, are you feeling shy?” 

“No, I’m not fucking shy! I just-”

Katsuki had no fucking idea how he was going to end that sentence, so maybe it was better that he was interrupted by a bright flash of pain. When his senses recovered enough, the sensation resolved into a harsh pull at the back of his scalp. It was within his tolerance level, but only if he bent his spine back to follow the hold, forcing him to bare his neck and belly. 

Katsuki let out a stream of curse words, half from the pain and half to vent his arousal. He wasn’t brought so much as shoved halfway into his headspace from the position alone, but Izuku wasn’t done. With a smug air, he crooned, “Ah, I understand now. My pretty baby needs some help getting down before he can be Good for me like he wants, isn’t that right?” 

Katsuki wriggled like a caught fish under the hold for a few more seconds, but… Goddamnit, Izuku was right. The last of his tethers snapped as he gave in with a blissful moan to Izuku’s sturdy hands.

Katsuki let himself float in the waves of his mental ocean, and was immediately rewarded for it with a tidal wave of sweet praises while Izuku gathered up his half-limp body. “That’s it, sweetheart, just like that. Look at you, baby, you’re being so good for me, letting me hold you. Come here, pretty boy, let me kiss you,” Izuku said, honey dripping from his tongue, but his words were still so sincere they burned. 

Katsuki gave himself over easily to the requested kiss, letting Izuku claim his mouth with a slow, devastating smoothness. If any of his sharp-edged defenses were left, that kiss washed them all away, leaving Katsuki pliant and exposed.

It was okay, though. Izu would take care of him. He was always so careful with them, far more than Katsuki deserved, but he knew better than to doubt how well he was loved by now. 

With a sort of airy reverence, Izuku asked, “Now, will my baby boy tell me what he wants first? Anything you want, love, we’ve got all night.” 

Baby boy. Katsuki’s throat dried at that so fast he could barely speak.

It- It wasn’t all that different from what Izuku usually called him, he knew that, but it felt different, somehow. It brought to the surface what the whole premise of tonight was. Izuku was- wanted to be called ‘Daddy.’ It still felt like touching a live wire to even think, but it was a little easier now that he was floating. 

Oh, right, Izuku had asked him a question. Remembering his initial reaction to the idea, Katsuki managed to force out the words. “Wan- Wanna suck you.” He tried to get out the rest, but faltered. He couldn’t quite make himself say the words he really wanted to say, but it was something, at least. 

Izuku cocked his head as if to hear the words behind the pause, and something settled behind his eyes. He leaned closer, looming until he felt larger than life. He nudged the underside of Katsuki’s chin, urging him to tilt his head back up. He hadn’t even registered how low he’d let it get until the gentle correction. 

On the way, his gaze traveled past the thick chest and broad shoulders still mostly hidden by Izuku's school shirt, up to his sweetly freckled face, perfectly framing verdant green eyes, soft and deep enough to drown in. With the ghost of a smirk, he asked coaxingly, “Is that all, or did you want to ask for something like a Good Boy?”

The dam in Katsuki burst at the goading invitation, like all he had been waiting for was permission that he’d been finally granted. The sharp, almost-pain of the shift caught in his chest, provoking an involuntary, pathetic whine. The riptide of want pulled him under in an instant, and with the last of his inhibitions gone, the words he had held back flooded out. 

“Please, Daddy, fuck my mouth. Wanna be Good.” Saying the words out loud felt a bit like ripping thorns out of his chest, and Katsuki had just enough lucidity left to still be embarrassed by how childish his voice sounded, but it also felt… right. If he was Izuku’s baby boy, wasn’t that childishness sort of the point?

Katsuki wasn’t sure yet, but Izuku didn’t seem to dislike it, at least. He seemed to like what he said a lot, actually, judging by the excited, biting kiss Izuku gave him in return. 

“Fuck, baby. So Good for me,” Izuku said, and the hunger in it was intoxicating. “Yeah, I’ll fill that pretty mouth of yours as much as you want. Want to spoil you rotten, sweetheart.” The familiar promise let Katsuki sink a little further into his headspace, knowing how this part of their game went, at least. 

Smiling over his shoulder, Izuku said warmly, “We’re going to take such good care of you, aren’t we, sweet boy?” 

Katsuki gasped as he was suddenly reminded that Shouto was in the room for the second time tonight. It wasn't that Katsuki wasn't glad he was there; he was. He wanted to share this with Shouto so badly.

No, what had caused him to freeze and his stomach to drop was that Katsuki had forgotten in the first place, was that Shouto was separate enough to leave the edges of his tunnel vision at all. Katsuki felt absurdly guilty, but apologizing would mean having to explain, and that might hurt Shouto more than anything else.

“Could you please go get a cushion for Katsuki, honey? He looks so pretty on his knees, after all,” Izuku said with a sly seductiveness, distracting Shouto enough that both of them were oblivious to Katsuki’s dumb brooding. 

Thank fuck. 

He was relieved, mostly because Izuku always Saw too much when Katsuki was like this and was prone to lingering on the hurt even when it was better to ignore it. But also… He didn’t think he could handle Izuku being disappointed in him right now, no matter how far-fetched that was. Something about the- the ‘Daddy’ of it all left Katsuki chasing his approval like a junkie chasing a high, even more than usual. 

Part of him knew that worry was bullshit, but that part of Katsuki's brain was still too busy trying to convince himself that Shouto wasn’t pissed at him for being ignored for a little bit to help. What Katsuki desperately needed was a distraction and to have his mouth full so he couldn’t say anything stupid for a while. Luckily, Izuku was offering exactly that.

In his hurry to get what he had been promised, Katsuki fell to the floor the second he heard the soft thunk of the cushion landing. He reached out his hands to undo Izuku’s pants and finally get his mouth on him, but they were snatched and held back before he could. Just as Katsuki was about to complain, Izuku stopped him. “Hold on, baby. First, Shouchan, could you come sit behind me?” he directed.

Katsuki watched them from beneath his lashes, not ready yet to meet their eyes, as Shouto cuddled Izuku close, hooking his chin over one shoulder even though he had to stoop a bit. There was a wave of longing to be the one Shouto was holding like that, but Katsuki knew, even if they didn’t, that he hadn’t earned that yet. 

Izuku acknowledged the new addition with a kiss to the cheek and then turned back to him, missing the bright red that Shouto turned, but Katsuki could see it in the edges of his vision. It was so cute, and he hoarded the memory away like he had all the other memories of his boyfriends being adorable, just in case. 

“Kacchan,” Izuku called, bringing him back to the moment. “Sweetheart, could you clear your palms for me, please? Quick is good, but quiet is better.” 

Oh. So that’s why Izuku stopped him. Now that Katsuki was paying attention, he noticed that his hands were almost dripping with explosive sweat. Shit. He’d almost ruined Izuku’s good pants. 

There was a surge of gratitude to the kind man above him. Izuku would have been well within his rights to fuss at Katsuki for the careless mistake, but he hadn’t, not at all. Not only that, but he’d given Katsuki a Task, simple but constructive, to concentrate on, which was just what he needed. 

Izuku was good like that. A good… daddy, the word small and tentative even in Katsuki's thoughts. The gentle correction and simple instructions knocked the breath from him, in awe of how easily Izuku just- just Loved him, took care of him. 

Katsuki had been told his whole life that being 'taken care of' was pathetic, that he should take care of himself and not need anyone else if he wanted to be strong. Katsuki… didn’t want to be strong right now, though. He just wanted to be small, safe, and Theirs. If that meant being treated like a toddler, so be it. 

(Not that he’d been treated anywhere near this kindly when he was an actual fucking toddler, not really. But Katsuki was already dealing with way too many Feelings, so he shoved that depressing thought aside. He could process that shit later, like, in therapy, maybe.)

With the ease of years of practice, Katsuki focused on burning off the nitroglycerin from his palms as quickly as he could without being loud enough to trigger Izuku’s startle response. He had something to focus on now, at least, but Katsuki still felt restless. Izuku, somehow knowing what he needed before he did, gave Katsuki his fingers to suck on. It felt embarrassingly like a baby being given a pacifier, but it worked.

The whole process took a while with so much buildup, long enough that Shouto was asked to undo Izuku’s fly instead, as the only person with two free hands. Katsuki watched in a haze as Shouto lingered there with half-lidded eyes, relishing the task with a slow sensuality that must have felt fucking heavenly for Izuku. 

Izuku chose to vent that pleasure by fucking his fingers deeper into Katsuki’s mouth, almost to his throat. The casual invasion of it pulled him blissfully back into floating. With his mind hazy, Katsuki was struck by a powerful urge to touch Shouto, to connect skin-to-skin, but Shouto was still fully dressed, so Katsuki took what he could get.

The second he was done clearing the explosive material from his hands, he gripped onto Shouto’s soft thighs, only to remember a second later how fucking hot his palms would still be. Shit. It was a good thing Shouto had a high heat tolerance, or that might have been painful. 

Before Katsuki could fall into another guilt spiral, though, he was distracted by Izuku taking the fingers out of his mouth. Katsuki took this as his cue to put as much of Izuku’s dick in his mouth as he could manage. That turned out to be… all of it, because Izuku was still mostly soft, some-fucking-how. 

Not going to lie, that was a bit of a blow to Katsuki’s pride. He knew Izuku was a lot slower to rise than he was (which was probably for the same reason that he had a fucking ungodly amount of stamina as long as no one touched his prostate), but still, it made Katsuki feel like he’d been slacking. 

Both of his boyfriends reacted to Katsuki’s pouncing with a startled gasp, but neither sounded like pain, so he let himself savor the feeling of finally having his mouth full. He didn’t even try to hold back the moan, knowing that it would feel great for Izuku.

That won Katsuki a deep, heartfelt moan from his D- from Izuku. Even better, it was followed by a drawled-out “Oh, gooood boy,” that, when combined with the whole… Daddy concept, was enough to make him shiver pleasantly. What knocked Katsuki back over the edge, though, was the way Izuku’s hands knotted in his hair to hold him close.

He could feel Izuku’s cock hardening on his tongue, filling him more and more by the second, and Katsuki was pinned there, made to take it exactly as he was, with no ability to adjust the angle or back off when it reached the back of his throat. 

It was fucking glorious.  

Izuku’s cock filled him inexorably, pushing every negative thought out of his head with the inevitability of the tide. With no way to access his usual tricks, Katsuki's gag reflex hit with a vengeance, but even when he struggled and choked, Izuku didn’t let him up. He whined at his inability to do this without gagging messily and tried to pull back, but still, he was held there.

Katsuki… Katsuki was fucking up, was failing, and he wasn’t being allowed to fix it. Needing to see why, he opened his watering eyes to look up at the man doing this to him. 

He wasn’t sure what he was expecting. Sternness, maybe, if this was some sort of punishment? Izuku usually told him when he did that, though, and let Katsuki know what he’d done wrong first, so that didn’t make sense. Maybe Izuku was just messing with him a bit, and he’d find a joking smirk.

But, no, he didn’t find either of those. When he looked up, all he found was pure hunger. 

Green eyes as dark as a nighttime jungle stared down at Katsuki like they wanted to consume him whole, like his choking obedience, despite his body’s instinctive protest, was something to be savored. Like the clumsiness of it was the Point, was what Izuku Wanted. 

That look burrowed into the core of Katsuki, melding with the many existing ties that bound him to Izuku and braiding them together, bolstering them with the bone-deep knowledge that Izuku wanted, Craved, his surrender, his weakness, his uncertainty, and failure. All of the things that Katsuki saw as pathetic, Izuku Wanted from him. 

It had gotten easier, though never easy, to accept that Izuku wanted Katsuki, loved him, and saw him as valuable despite his mistakes. He had accepted the fact that Izuku genuinely admired him for his strength, his talent, and his determination. Katsuki had even learned to trust that showing his flaws wouldn’t make Izuku love him any less.

But even though Izuku had said it was the truth many times, Katsuki had never quite been able to wrap his head around anyone actively liking his weakness, his pathetic moments, all the things he’d been taught all his life to despise in himself. Here, though, in this moment, Izuku undeniably Wanted this. He Wanted Katsuki when he felt small and helpless, he Wanted him when he was doing his best and failing.

It was… so, so Much, but Katsuki was held tightly and made to accept it, in much the same way that he was being held physically. 

Just as Katsuki started to get truly overwhelmed, movement drew his eye. He saw Shouto, peeking over Izuku’s shoulder, his eyes wide with lust but his brow slightly crinkled with worry. Katsuki felt a tap on his wrist, reminding him of when he had done the same to Shouto as a way to ask if he needed to tap out. 

That small gesture of care hit Katsuki like a truck in his vulnerable state. He knew he wasn't going to tap out, that he Wanted this, every fucking second of it, but he Needed to reciprocate the sentiment somehow, or his heart might burst with all the love bubbling up like a cracked soda bottle. Clumsily, he grabbed at Shouto’s hand, the same one that had tapped him, and held on tight, trying to Show him through touch alone. 

When Shouto squeezed back, it felt like an acknowledgement, but more like a benediction. Relief flooded through Katsuki, and, by some odd alchemy of the emotions and the physical, that finally allowed him to calm his choking, letting him swallow Izuku’s cock like he needed to, even though it blocked off all but the barest breath.

Katsuki collapsed like a puppet with its strings cut from the sudden release of tension, only held up by the steady grip on his hair. Like the song of a forgotten god, Izuku spoke. “Good job, baby, you did so good. I knew you could do it, Katsuki.”

Oh. Katsuki hadn’t known he needed to hear that until he already had, but it felt like popping a joint back in that had been dislocated for so long he had stopped noticing the pain of it. 

“I’m so proud of you, baby boy, you’re amazing. Just a little longer, sweetheart, and then I’ll let you up. So Good for me, my baby, so precious.”

The liquid sunshine of Izuku’s praise filled Katsuki's veins the way it always did, but there was a subtle flavor to it that hit even deeper somehow. It broke him down in the best way, and he started to cry like a goddamn child in their hands.

It should have been embarrassing, but here, where he was held and loved by people who were strong enough to keep him safe when he was weak, it felt like Katsuki was doing exactly what he was supposed to. If they wanted to take care of him, well, he loved them enough to let them. 

As if Shouto had read his mind, he squeezed Katsuki’s hand again, getting his attention. Their eyes met, and the look Shouto gave him was heartbreakingly soft.

As if that wasn’t enough, his other hand cupped his cheek and carefully wiped his tears away. It wasn’t a conscious choice to fall into that simple touch, but his eyes closed and his head leaned into Shouto’s palm without waiting for permission. 

Too soon, Shouto retracted the touch, but Katsuki saw why once he opened his eyes. The subtle expressions their Ice Prince normally made were wholly overshadowed by the scrunched misery on his face, even though he was trying his best to hide it in the crook of Izuku's neck.

Luckily, Izuku brought Katsuki back up at that moment, so he had enough air to be able to gasp. Looking over at Izuku, though, Katsuki didn’t think he had clocked Shouto’s upset yet. He wanted to do something to help, but the problem was that Katsuki didn’t know what was going on to make Shouto so distressed in the first place. Was he panicking? Sad? Overwhelmed?

Katsuki wasn’t sure, but he didn’t think it was a good idea to let Shouto marinate in whatever it was. Carefully, trying his best not to startle him, Katsuki pulled at the hand still clutching his to get Shouto's attention. After a few tries, Shouto went with the pull, opening his eyes enough to peer down at him in confusion.

Following his instincts, Katsuki brought their joined hands closer and kissed Shouto’s knuckles in a gesture he hoped was soothing. It meant he had to relinquish his (now shallow) mouthful for a moment, but it was well worth it. Katsuki was expecting some kind of reaction, like maybe some relaxing of the tension radiating from Shouto, or a fond look, or even a smile if he was lucky.

He was not expecting a shocked gasp, followed by a broken-open expression splashing across Shouto’s face, exposing something that was too resigned to be called longing. Maybe 'loneliness' was a better word. Or 'pining', if pining ached like an old wound. 

Katsuki breathed carefully, trying to get a handle on his thoughts. He knew he could read Shouto a hell of a lot better than he could most people, but he couldn’t be completely sure, especially with something that complicated, that he wasn’t letting his imagination run away from him and making up shit that wasn’t even there. After all, they had been together for… a month now? Surely that was enough time for Shouto to know that they- 

Katsuki couldn’t even finish the thought, because he already knew that it was utter bullshit. People didn’t work like that, especially Shouto. Shit like that took time and effort to heal, and Shou was the kind of person who barely paid attention to his own emotions until they were kicking him in the face. Of course he was having trouble believing this was real, when he’d spent so long thinking it never could be. Katsuki still wasn’t sure what about this situation in particular had brought up those old hurts, but he did know what he himself had needed when he was feeling something similar.

Inspiration hit, and he tugged that same hand over to where Izuku was holding him by the hair. Seeing what he was doing, Izuku backed him up, letting Shouto be the one to cup his scalp, and laid a hand on top to hold him there. Shouto’s breath stuttered, and he pulled his grip closer, probably more out of startlement than anything. Still, Katsuki moved with it to illustrate what he was offering.

Izuku let out a soft, appreciative noise, then turned and whispered something in Shouto’s ear. Katsuki couldn’t quite make out the words, but the tone was familiar, a particular mix of seductive and wholesome that was so contradictory he was fairly sure it was impossible for anyone but Izuku without breaking the laws of physics or something.

Whatever it had been, it made Shouto look at Katsuki with something half vulnerable and half tempted. Anything Shouto needed from him, Katsuki was more than happy to do, so he gave him a long yes-blink to whatever it was he was asking permission for. 

Visibly bracing himself, Shouto started directing Katsuki's movements, though it was so tentative that it was more a question than a demand. Gradually, he started to grow more confident, but even then, Shouto was heartrendingly careful, like Katsuki was made of porcelain or sugar straw.

It was only when Izuku started making it obvious how much he liked it that Shouto got bold, fucking Katsuki’s face onto Izuku with a fascinating level of precision. Even then, he froze instantly the first time Katsuki mistimed a swallow. It wasn’t until Izuku put his own weight behind the hold that they let Katsuki go far enough to actually be fucking his throat.

Once Shouto got the hang of it, though, he did it every time, with the steady pace of a fucking metronome. It felt insanely good, especially when Katsuki resisted just enough to make Shouto shove him down with force.  

Just when Katsuki thought it couldn’t get any better, Izuku decided to run his mouth in that way that was guaranteed to make both him and Shouto go nuts, even on a normal night. “Look at you, sweetheart, so fucking pretty for me. Both of my boys are treating me so well. Feels so good, love, can’t get enough of your mouth,” he said, gushing praise like water from a wellspring. 

“I’d say you’re spoiling me, but I think we both know who’s really getting spoiled here,” Izuku continued, and Katsuki could hear the start of something diabolical creep into his tone. Something was coming, and he wasn’t sure which of them Izuku was aiming for, but he knew it was going to be devastating. “Shouto’s being so nice to you, isn’t he, baby? Fucking your face all sweet like that, without even getting to feel my baby boy’s slutty throat.” 

Oh. Oh, shit. Izuku’s voice twisted into that perfect mix of condescending pity, petty cruelty, and sweet indulgence that Katsuki always fucking loved, even as he railed against it. Now, though? Now, it made Katsuki feel more like a child than ever; specifically, like a spoiled brat chasing his Daddy’s approval and willing to do anything to get it. 

Izuku had to know, he had to, because he asked with a sly twist to his voice, “Do you want to show him how Good my gorgeous, slutty baby boy can be?” And, oh fucking hell, Katsuki really did. The thought of Dadd- of Izuku showing him off to Shouto like this was hot enough to scorch, and he could tell by the temperature flare from Shouto’s hand that he was just as excited. 

Izuku smirked, and it was one of the sexiest things Katsuki had ever seen. “Yeah, I thought so. If he’s even a little meaner to you, you’re going to come without a single touch, aren’t you, sweetheart?” he asked with a cruel glee that made Katsuki want to bare his throat, both metaphorically and literally. His pelvic floor flexed, and the indirect stimulation to his prostate hit his simmering arousal like a spark to dry tinder. 

“Do you want that?” Izuku asked, as if it wasn’t obvious. Katsuki had no way of answering, but he tugged pleadingly at their clothes and prayed that it would be enough. 

The gods must have been on his side for once, because Shouto immediately shoved him down deep, fucking Izuku’s cock into his throat quick and dirty, barely letting him up enough to breathe before pressing him back down. Even better, Izuku started thrusting into his mouth too, hard enough that it felt like his lips would bruise from the impact. 

With every beat, Katsuki rocked his hips and tensed his internal muscles, sending sharp bursts of pleasure through his body. It took almost no time at all for it to crest, and that simmering lust boiled over. He had so little breath to spare, but Izuku saw him coming and decided to steal the last of it, burying himself as deep as he could go. 

Katsuki couldn’t breathe, and the lack of oxygen made his vision go white and his ears ring. The rolling thunder of his orgasm crashed through him, his forced breathlessness pushing it into something beautifully transcendent. His body fought the hold on reflex, but he trusted Izuku and Shouto to hold him through it. 

When it was over, there was a timeless moment of utter bliss where Katsuki felt his body burn with golden light, more feeling than form, cut off from any sense of comprehension. It was something More than pleasure, rich and complex and overpowering. 

And then he could breathe again.

The rush of sweet oxygen hitting Katsuki's starved bloodstream was so good that it might count as a second orgasm. His senses rushed back in, the sound of his own ragged breaths deafening in his ears. Many hands were holding him, careful and reliable, and Katsuki let himself be held with a happy sigh. 

Strong arms wrapped around him and lifted him from the ground, holding him tight to a warm, broad body. More arms surrounded him, bringing with them a cool not-breeze that instantly relieved the overheating that Katsuki hadn’t even consciously registered yet. He made a vague noise to express his gratitude, the sound frayed from the heavy soreness in his throat. 

A quiet voice started to talk, but he couldn’t quite process the words. The tone was affectionate and proud, though, so Katsuki wasn’t worried about it. If it was something he needed to respond to, they would tell him later. 

There was some shuffling that happened, and Katsuki was passed from one set of strong arms to another. A wet cloth ran over the junction of his legs, wiping away the stickiness from his skin. After that, a big, muscled body carefully draped itself over him, pressing Katsuki down until he could once again feel the boundaries of his own body. The sound he made in response was pure hedonistic bliss, heightened by the low rumble of the chest underneath him.

Izuku’s voice filtered in. “My cute boys,” he sighed, voice dripping like syrup. 

Mmn, that was nice. Katsuki was all kinds of floaty, but he liked that Shou was included, too. Shou seemed happy too, rubbing his cheeks into Katsuki’s hair the way he did sometimes. It was a Good Touch, which Shou was real good about, way better than most people. Katsuki was too blissed-out to return the favor, but he figured lying on top of him to give the Good Squish counted well enough. 

Izuku asked, light as soap bubbles, “How are you feeling, baby? Are you ready for more, or do you want to take a break?” 

At the suggestion of ‘more,’ Katsuki perked up a bit. The only thing better than being Squished right now would be if Izuku were filling him up, too. Katsuki could feel that big-pretty dick still hard against his hipbone. He rolled his hips up onto it as temptingly as he could, pettily hoping it was oversensitive as revenge for getting Katsuki off before Daddy could come in his mouth like he’d wanted. 

…Katsuki was going to pretend he hadn’t just thought that. 

It probably didn’t work anyway, considering Izuku just laughed at the move. It was his surprised-happy one, though, so Katsuki wasn’t mad. Especially since he replied with an easy, indulgent, “Alright, alright! Oh, baby boy, what am I going to do with you?”

Well, Katsuki knew what he wanted Izuku to do with him. “Fuck me?” he requested as winsomely as he could. 

That one got Shou to laugh, too, surprising a high-pitched celebratory sound out of Katsuki before he could think to stop it. Shouto puddled happily underneath him, and Katsuki mentally added Snowmelt to his growing list of fun things to call him.

Izuku answered, breathless and sweet, “Sure, baby, we can do that. Do you want it to be me that fucks you, or do you want Shou?” 

Katsuki hummed as he considered his options. Now that he thought about it, he definitely wanted Shouto there too, but he still wanted his Da- damnit, Izuku to fill him up. What about if… “You fuck me while I suck Shou?” he suggested. 

“Sounds good to me. What do you think, sweet boy?” Izuku asked Shouto excitedly. 

Shou’s voice, when it came, though, was distant and wobbly. “Oh. I- um. Yes. Yes, I can do that,” he said, but Katsuki immediately called bullshit on that. Sure, he had no doubt Shouto would do his best, but he sounded about two seconds from crashing, hard.  

Shit, he’d been so busy floating, he’d forgotten how rough their Snowflake had looked in the middle there. He’d recovered well in the moment, but Katsuki knew all too well from his own experiences that sometimes that just put the Feelings off until they had stopped to rest. 

Shouto made a confused noise even though they hadn't said anything yet, so Izuku must have made some kind of face. Shou pretty obviously didn’t realize how he had sounded, or maybe why they weren’t going through with the plan once he agreed.

That was not fucking happening if Katsuki was anywhere close to right about him crashing, but shutting Shouto down would probably make whatever it was worse, so he just asked carefully, “You good, Shou?” 

“...Why?” 

Why? Why? Katsuki kind of wanted to shake him, but Shouto’s voice was still all flat and distant, like he got sometimes when he was too overloaded to remember to put tone into his words. 

Right, okay. Katsuki recalibrated, trying to figure out what he would want for himself when he was emotionally short-circuiting.

Wriggling to get a good line of sight on Shouto’s face (though the chances of that telling him anything more than his voice were slim), Katsuki answered the question as plainly as he could when his brain was still feeling like a cooked noodle. “You sound kinda out of it, s’why. Now answer,” he reminded him. 

“Oh. Right.” Shouto blinked. “I’m…” he started, some life coming back to his face, which seemed like an improvement, even if it was just confusion. “...not sure,” he finished, starting to frown. 

Izuku lifted his head up, no doubt for the same reason Katsuki had contorted himself between them. Eyes full of concern, he asked, “Honey, do you need a break?” 

Shouto tensed at the question, a horrible fear showing in the whites of his eyes. Katsuki’s mind whirled as he tried to figure out why that had spooked Shou so bad he stopped fucking breathing. While he thought, Katsuki did his best to help him, petting Shouto’s chest in slow, calming circles to try and coax him into relaxing. 

In response, Shouto finally dragged in a deep breath, but soon they shortened, going shallow and jagged. His muscles were still so locked up that Katsuki could feel them under him, rigid and uncomfortable. That wasn’t nearly as important as making sure Shouto didn’t have a panic attack, though, so he said as gently as he could, “Hey, hey, just breathe, Snowpea.” 

Katsuki was starting to get a vague idea of what might have set him off, so he threw out the best words he could think of. “We’re not going anywhere, okay?” he assured Shouto, feeling more like it was a lifesaver float tossed blindly overboard than any kind of anchor. 

The cracked-open sound as Shouto tried to argue said Katsuki was on the right track, though, and luckily, this wasn’t a solo mission. Following on his heels, Izuku swept away the attempted denial. “Oh, sweet boy, no. The break would be all of us, promise.” 

Shouto stopped, and then a second later, he went from feeling like lumpy rock underneath him back to soft boy again. Damn, Izuku must have hit the nail on the head. Had Shouto really thought they’d fuck off and continue without him if he asked for a breather? But Katsuki knew shit like that was rarely rational. 

He didn’t have good enough words to help that way, so Katsuki poured himself into showing with firm, dragging touches over Shouto’s arms and sides how much he wanted the lithe boy to be exactly where he was. Besides, Izuku had the words part more than covered. Soft and sticky-sweet, he told Shouto, “Oh, honey, we’ll always wait for you if you need us to. You’re Ours, remember?” 

Shouto reeled Izuku in for a needy kiss. Very tired of having to be in this weird, half-twisted position with no easy way to give Shouto that same affection, Katsuki took advantage of Izuku shifting his weight to elbow his way into being able to flip face-down without giving up the prime real estate of Shouto’s chest. 

Successful, Katsuki stuck his face in the cozy gap between Shouto’s jaw and shoulder, contemplating getting in on the whole kissing thing as well while he was there. Before he could, though, Izuku decided to rock his dick against the cleft of Katsuki’s conveniently placed ass. It pressed him straight down onto Shouto’s half-hard cock, which he worried about for about half a second before he heard the plaintive whine Shouto made.  

Katsuki’s arousal boiled back up in an instant, and his throat tightened around a whimper of his own. Izuku didn’t repeat it, though, and it soon died down to a low simmer with the combination of being Squished and his two boyfriends kissing lazily around him. He amused himself for a while by mouthing at Shouto’s neck, but eventually he settled into a contented half-doze now that he knew everyone was taken care of. 

At some point, Izuku stopped the kissing and climbed off, which meant Katsuki was no longer being Squished. He was still way too comfortable to even think about moving, though, and he made that very clear when Izuku gave him some suggestive nudges. If Shou didn’t want him off, he didn’t have any good reason to be anywhere else. 

As if to prove that point, Shouto started to radiate a gentle heat, leaving Katsuki as blissed-out as a lizard on a warming rock. It was relaxing as hell, and he thanked Shouto with an enthusiastic moan before wriggling further into that perfect warmth. 

“Spoiled,” Izuku teased, and he was right. Shouto was spoiling the fuck out of Katsuki. The smug smile that took over his face was somewhat wasted by no one being able to see it, but he didn’t care.

This was the kind of affection he’d wanted his whole life, plus so much he hadn’t even known was possible. Maybe his happiness looked different than how he thought it would Before, but it was so much better, like the difference between running a fever and being wrapped in a warm blanket.

Katsuki was selfish enough to soak up every last ounce of this now that he’d found it. Or was it more that they found him? Either way, he was content in a way that, until recently, he hadn’t been since he was a child. And like a child, he clung and clung to what he loved, until he was sure that even death couldn’t take this away from him. He’d fight anyone who even tried, and he was going to be the Best so that he would always win. 

Yeah, that was something he and his younger self could agree on. An odd sort of peace filled him at that thought, and for once, he didn’t have to argue with himself in order to relax. Every part of him agreed: This was what he had fought for, what he would fight to keep. And what was the point of winning if he didn’t stop and enjoy the victory?

Chapter Text

Izuku had been bouncing on the balls of his feet ever since class had ended. He knew Katsuki was probably waiting in his room for him, and probably Shouto, too. He was less sure about whether Shouto would be there specifically for their potential new kink experiment, but he would almost certainly be there. He loved Katsuki’s room, maybe even more than Katsuki himself did. 

That was okay; if Shouto wanted to sit this one out, Izuku had contingency plans for that. 

A greedy part of him hoped that their new boyfriend would be willing to join in, but his reaction at lunch had been a bit too neutral for Izuku to accurately gauge his interest in the whole ‘Daddy’ concept. It wasn’t necessarily a bad sign, though. Shouto tended to need more familiarity with things to know whether he liked them or not, especially sexual things, from what Izuku had observed so far. 

To be honest, one of the more reliable indicators so far about whether Shouto would be into something was if Kacchan thought he would like it. He seemed to already have a sixth sense about the quiet boy, which Izuku tried not to pout too much about. After all, that tended to be how a lot of things went with him and Katsuki: they would both find something worth doing, and Katsuki would almost immediately pull ahead through a combination of instinct, intellect, and bold determination until he deemed himself sufficiently skilled. Meanwhile, Izuku would fall behind, struggling and desperately gathering as much information and knowledge as he could. 

Eventually, Izuku would catch up to Katsuki’s early plateau, usually with a broader and more conscious understanding than intuition by itself could provide. Katsuki would see that Izuku now had the edge and would lose his complacency, striving to overtake him, and by competing, they would both push each other to improve. It was a good system, and it had made them both better heroes and people, so Izuku could only hope it would also make them better partners to Shouto. (It certainly had worked for building their own relationship.) 

First, though, Izuku needed to actually get to his partners and talk to them. He had watched as everyone made the trek back to the dorms and seen the way both of his boyfriends were subtly hurrying upstairs. He took the hint and did his best to extract himself from his cluster of friends to head to Katsuki’s room. Unfortunately, Uraraka tended to be a bit unintentionally pushy, and Izuku had a hard time saying no, so it took longer than he would have liked, but he eventually managed it. 

Judging from the shoes at the entryway, Izuku was the last to come into the soundproofed room, toeing off his red hightops and locking the door behind him. Katsuki and Shouto were sitting quietly on the bed, leaning their shoulders together in silent support. Izuku smiled at the pretty picture they made and the fact that he got to join them. It was a familiar feeling now, but he still reveled in it whenever it came up. He knew how lucky he was, and he was determined to enjoy every bit of that good fortune. 

It was only partly about how utterly gorgeous the two men he got to call his partners were. They were undeniably beautiful, yes, and complemented each other well, with Katsuki’s bold, angular features that had settled into a clean sort of masculinity as they grew older, contrasting wonderfully with Shouto’s heart-shaped face and flowing, silky hair that lent a hint of androgyny to his svelte, long-limbed frame. More than that, though, Izuku knew them and how amazingly strong and Good they could be. That they wanted Izuku just as close could only ever be a blessing.

Turning his mind back to the details of the present moment, Izuku noted that both of them had forgotten to take off their socks, which was odd with Katsuki’s usual level of fastidiousness. He hated wearing socks any longer than he had to, and Shouto had quickly followed suit in the habit once he’d felt the soft rugs Katsuki had carpeted his floor with. Izuku wasn’t sure yet what it meant for their state of mind that they had neglected that step in their routine, but he kept the mental note as something to investigate later. 

For now, Izuku went over and gave his usual greeting of hellos and cheek kisses, taking advantage of how close they were to bounce from one of them to the other as quickly as he could. He pulled back a bit, expecting their normal responses, but both of them seemed a bit too dazed to greet him like they usually would. Shouto, at least, had a soft blush on his cheeks, but neither of them spoke. 

Izuku might have been concerned, but then Katsuki pulled him down into a very thorough kiss, one that had that edge that only came when Katsuki had been worked up for too long to even pretend at patience. It was biting, forceful, and filled Izuku with a warmth like nothing else at the tangible expression of Want. 

Well. That was a very good sign. 

“Kacchan is so excited today,” he remarked happily, amused by how Katsuki’s ears flushed red whenever he pointed that out. “Does this mean you still want to try out what we talked about earlier?” Izuku tried to tamp down the hope in his voice to something casual, not wanting to give away just how much he wanted this until he had a better read on where they stood. 

Katsuki nodded eagerly, making Izuku’s heart beat faster in anticipation. Still, he turned to Shouto, wanting to see his reaction. He seemed to take that as extending the question to him and nodded just as quickly. That surprised Izuku a little, but he gladly narrowed down his ever-branching collection of Plans to the ones that included Shouto actively participating. 

There was still one big branching-off point that needed to be addressed, so Izuku took the opportunity to ask Katsuki, “And would you like me to fuck you today, sweetheart?” 

He… may have added a little flair to how he asked to influence Kacchan’s decision there. It was worth it to see the flare of arousal in those pretty red eyes, along with an enthusiastic, “Oh, hell yes.” 

Izuku admittedly got a bit greedy, turning to their other partner to ask, “And you, Shouchan?” 

Shouto bit at his pouty bottom lip in thought, but then shook his head. “Not… that way, at least.” Izuku was busy enough letting go of some of his more decadent potential plans at the denial that he almost missed the exact words Shouto used. Almost. 

Trying to figure out what other ‘way’ Shouto could mean, he studied the boy sitting in front of him. He squirmed under Izuku’s gaze, sliding his thighs against one another meaningfully. 

Oh. Well, he could definitely accommodate that request. “Understood, darling. I’ll keep that in mind.” 

Izuku wondered what part of having Shouto’s thighs fucked was preferable to him being inside. Maybe he could still… Well, he could ask later. Now that he’d seen how antsy Katsuki was, Izuku knew he needed to get this started soon if he wanted the blond boy to be in the kind of mood he was going for. 

First, though, “Katsuki, baby, are you okay with our usual safety measures, or do you need something different?” 

“No, no, I’m good with the usual shit,” Katsuki assured him with a speed that said Izuku was right about needing to move this along. He couldn’t resist grinning at the blatant eagerness, though, or at how Shouto let out that quiet, huffing laughter of his at the response. 

Turning to him, Izuku asked temptingly, “Shou, love, could you help me get Kacchan undressed, please?” He wanted Katsuki plenty distracted to keep him from getting his back up at the laughing, just in case. He didn’t react as badly with Shouto (or Izuku, most of the time) as he did with most people, but there was nothing wrong with stacking the odds in their favor. 

Shouto complied easily, shifting behind Katsuki to tackle the row of tiny buttons Izuku’s scarred fingers always had trouble with and instead letting him take care of the easier trouser fastenings. 

Izuku gladly went down on one knee, undoing Katsuki’s fly before reconsidering and propping one socked foot on his raised knee and working the sock off first. There was something tender about the action, a soul-filling contentment in how willingly Katsuki was allowing himself to be cared for right now. It mixed wonderfully with the glowing emotions that came when he learned Katsuki wanted to call Izuku ‘Daddy.’ 

Izuku could still barely believe it. The reaction the idea had gotten had been playing in his head over and over since it happened. Izuku had been dozing on the roof during lunch, enjoying the sunshine and the soft murmur of his boyfriends’ voices, but had cracked an eye open at the weird croaking noise Katsuki made. Something had made him flush worse than that time they stayed too long in the sauna, and his mouth was gaping open and closed like a landed fish. 

‘Okay,’ Izuku had thought, ‘this is definitely worth waking up for. What the hell had Shouto said to get that kind of reaction?’ Well, there was only one way to find out. 

“Shou? Wha’ happened, why’s Kacchan blushing like that?” 

Izuku had giggled at the explanation of the joke he’d made about Katsuki being ‘Baby,’ not ‘Daddy.’ Shouto’s sense of humor was so wacky sometimes, and it was uniquely delightful. 

Then Izuku remembered what had drawn his attention in the first place, and had turned a considering eye to Katsuki. His face was screwed up in embarrassment during Shouto’s retelling, but the normally loud-mouthed blond had been entirely silent. 

Giving Katsuki a little half-smile, Izuku had decided to go out on a limb. “Well, you are my baby. Would you like to call me that?” he asked lightly. 

Katsuki’s eyes had gone round with surprise, but the deepening flush had told Izuku he hit something good. Kacchan had been hesitant, almost awkward about it, which was unusual for him, but that happened sometimes when he was caught off guard by intimate discussions, especially around things that made him feel more subby. 

That connection had delighted Izuku in and of itself, but then Shouto had explained his thought process in more depth. He had felt a bit like he’d been stabbed at the ‘what I assume good parents are like’ part of that answer. Shouto had had so few people in his life who truly cared about him, and it always hurt to be reminded of that. Izuku felt honored, though, that Shouto thought of him as ‘caring’ and ‘encouraging.’ 

Hearing the rest of his description… well, Izuku couldn’t deny how true it rang for him. He’d always known that his dom headspace was more on the nurturing side of things, and he’d always had a Thing for ‘spoiling’ his partners, when he wasn’t teasing them. It had always felt like an indulgence that he wasn’t quite allowed (but took anyway) to treat them that way. 

Putting that vague collection of impulses into the context of something as cliché as a daddy kink was odd at first. Still, once he got over the ingrained taboo of it, the idea of Katsuki and Shouto willingly calling Izuku that, of them letting him act like that fully and without restraint, had threatened to make him dizzy. It seemed almost too good to be true, but when Shouto had asked, Izuku had been as honest as he could be in explaining how it made him feel. 

Their reactions to his stumbling words had been gratifying, to say the least, and now, Izuku let himself go up into that imagined mindset, a heady space where all that mattered was taking care of the boys he loved so much. Tenderly, he stripped the neglected socks from Katsuki’s feet, careful not to tickle him when he was being so well-behaved. 

Once that was done, Izuku went back up to his waistband, working with Kacchan to get everything off of him with the least amount of fuss. He couldn’t resist lingering on working the fabric past Katsuki’s ankles, just a bit. That tiny act of devotion filled Izuku with a satisfaction that he couldn’t name, but he wanted to enjoy every second. 

Unhooking the tangled fabric from Katsuki’s swinging ankles, Izuku noticed a distinct wet spot in the front of his underwear. Fascinated, he picked them up to take a closer look, and, yeah, that was precome. Huh. There was quite a bit of it, too. Katsuki must have been leaking for a while for them to be this soaked. 

There was only one reason why he would have gotten that wet already today. Feeling very smug, Izuku showed off the evidence to Katsuki. “Oh, baby, you must have been real excited for this. Was it hard, not squirming in your seat, sweetheart?” he asked teasingly, delight in the idea that a daddy kink, of all things, might have been so impactful. 

Izuku was prepared for some pushback, probably in the form of blustering, especially so soon into their play. That wasn’t what happened, though. Instead, Katsuki’s face went red, but his pupils blew wide, and he gave a small nod. The slack look that he only got when he was falling headfirst into subspace came over him, and something in Izuku sat up and took notice. 

“You did a great job, baby. I was sitting right behind you and I didn’t even notice,” Izuku told him genuinely, leaning into the softness he saw in Katsuki’s expression. As it always did when he was spacey, the praise for a job well done made his chest puff up with pride adorably. 

Pressing his luck once more, Izuku let himself speak the thought ringing in the back of his mind. “I’m not sure I could have made it through class if I had known how worked up you were. Might have dragged you out to the bathroom in front of everyone and fucked you full then and there.” 

The response he received for sharing his little fantasy was delicious, not only from Katsuki, whose eyes glazed over after a soft gasp while his freshly bared cock kicked up in interest, but also from Shouto. There was a wave of palpable heat that came from their more reserved boyfriend, which Izuku had learned was a surefire sign that they were onto something. 

Well, there was an easy way to reel Shouto into that little fantasy. Izuku couldn’t help his tone shifting into something cloying and poutingly mournful as he added, “And then poor Shouchan would have been left behind, having to sit there knowing exactly what we were doing, and not even getting to watch.”

The sadness in his voice was childishly exaggerated, especially since Shouto didn’t look put out at the idea in the least. Still, Izuku meant every word of his impromptu confession. He’d been two degrees from boiling over ever since that conversation on the roof. If he had seen Kacchan’s particular brand of horny fidgeting, it most likely would have sent him over the edge. (To be honest, it wouldn’t even have been the first time Izuku got too excited and drew him away to request a quickie. It just usually happened during the physical training portion of the day.)

Katsuki’s expression was surprisingly open, though, showing his dismay at even the idle idea of neglecting Shouto, and he turned to the taller boy behind him with pleading hands. The earnest gesture made Izuku’s heart go soft and squishy, as did the way Shouto jolted forward like a string was pulling him into the slow kiss they shared. He let out a besotted sigh as he watched the two prettiest boys he’d ever seen be soft to each other. 

As much as Izuku would have loved to just stay and watch his boys kiss, he had a Plan to move forward on. With how well Kacchan had responded so far, he needed to go get cleaned up before he fell too hard into his headspace. The last thing Izuku wanted was for Katsuki to crash. Not only would it put a damper on a very promising idea for all three of them, but Shou might react poorly to that being the result of something he had suggested. 

(Was it really the first time Shouto had been the one to come up with an idea for them? Izuku was taken aback by the thought, but the more he considered it, the more sense it made. Shouto was straightforward about intimacy when asked, but he wasn’t nearly as proactive as Katsuki or even Izuku. Plus, there was still a rather large experience gap, since he and Kacchan had gotten more than a year of exploration that Shouto had not.) 

Izuku got off his knees and quickly put away Katsuki’s clothes, getting back just in time to interject himself into a break in the kiss. Greedily, he buried his fingers in that spiky blond hair to get Kacchan’s attention. “Okay, love. Now, could my baby please go get cleaned up for me?” Izuku cajoled, claiming a kiss for himself as he did. 

Katsuki’s brow formed an unhappy little crinkle, so Izuku jumped ahead of the most likely objection he might have.  “I’m just going to ask Shou some questions and remind him of our rules. I promise we won’t start without you, baby.” 

Sure enough, Katsuki relaxed at the guarantee that he wouldn’t be losing out if he left the room. He did intentionally get up and walk away with a rolling gait to draw their eyes to his hips to make sure they wouldn’t forget about him, just in case, but Izuku certainly wasn’t complaining. The dark stare it provoked from Shouto was a nice bonus, as well. 

He seemed to get a bit self-conscious when he saw Izuku had noticed, though, and asked with a nervous cough, “You said you had questions for me?” 

Deciding to take a page from Kacchan’s playbook, Izuku requested a kiss before they got into discussing the details. It always relaxed him and put him in a better mood when Katsuki did that, so he hoped it would work with Shouto as well. 

It seemed to, with how easily Shouto melted into the kiss as soon as Izuku had offered it. He looped lithe arms around Izuku’s lower back with a sweet romanticism that he was utterly weak to. In return, he brought his hands up to cup Shouto’s devastatingly pretty face. As the kiss deepened, Izuku shifted to wrap his arms around the back of his neck, indulging in the cinematic feeling of it as he did whatever he could to make Shouto lose himself in the kiss. 

By the time they were done, grey-blue eyes were gazing back at him hazily. “Hmm, better,” Izuku said, more to himself than to Shouto, before starting them off. “Now, honey: how are you feeling about our plans for tonight?” 

Shouto got that vaguely beleaguered look in his eye, which Izuku was learning to recognize for what it was. Open-ended questions about Shouto’s emotional state were particularly difficult for him, but Izuku had yet to find a way to check in with him that would make that easier, at least so far. It was worth doing some brainstorming later, but for now, this would have to do. 

“Good,” Shouto answered easily, but Izuku waited to see if there was any more specific information. “Curious. …A little nervous.” 

Yeah, Izuku had thought so. “That’s understandable. This is the first time all three of us are trying something new together,” he reassured. “Is it just that, or was there something else worrying you?” 

Shouto averted his eyes and thought. “I am not sure where my role is in this. Or where you both want me to be,” he said finally. 

So he was having trouble envisioning the scene? Or was it that Shouto wanted to know his options? “Well,” Izuku said slowly, “I think the most important thing is where you want to be. But if you want to know my preference, I’d like to be in charge of this, but I’m equally happy to have you down with Kacchan or even under him if he’s up for that, or have you be my support while we both focus on him if you’d prefer.” 

Laying out some ideas seemed to help. Shouto looked him over, mulling over his options. Rather than answer, though, he gave a tiny smile that sent a fresh wave of infatuation through Izuku, and then turned around to slump back onto his lap and peer up at him from under long, tousled bangs. 

Izuku couldn’t have quelled the grin he broke into for the life of him. “Hi there, love,” he said breathily, admiring the sweet boy suddenly reclining against his chest. Wanting him even closer, he pulled Shouto in, which was a bit difficult when the boy seemed determined to act as though he had no bones at all. It was one of Izuku’s favorite things, the way Shouto had taken to flopping on top of him and Katsuki like a spoiled pet when given half an opportunity. 

With an affectionate peck to the spot where his hair split between red and white, Izuku asked his next question. “Just to be extra clear, when you said ‘Not that way,’ did you mean you didn’t want anything penetrative at all?” There were a few other ideas that he had that didn’t necessarily involve fucking Shouto, but that he would still need to clean up for, so it would be better to know now. 

He got an affirmative nod back. “Not today. Too much work,” Shouto said languidly. 

Izuku laughed softly at the sentiment, imagining the teasing that would come if Katsuki had heard it. The idea mixed with his thought from earlier, and he remarked fondly, “It should surprise me more how much of a lazy cat you can be like this, but it suits you somehow.” The adorably smug upturn at the corners of Shouto’s mouth said he hadn’t taken offence to the label. 

Getting back on topic, Izuku was a bit more direct and put out an offer. “I was hoping to get my mouth on you tonight. If you’re not up for it, I have plenty of other ideas, but if you are, you would still need to do the cleanup part at least.” Shouto looked tempted, but he still hesitated, so he clarified, “You don’t have to decide yet. We’ll probably take a break at some point, and you could clean up then if you want.” 

The boy in his arms relaxed and gave a happy ‘mhm,’ so hopefully Izuku would get his wish as long as he played his cards right. Plans churned in the back of his mind as he got back to the more basic briefing questions, checking that their established safewords and signals applied and didn’t need amending. 

That done, there was one more specific question he needed to ask, this one a bit more vulnerable. It hadn’t been very long since the first time, but Izuku definitely wanted it to happen again, so he had to ask. “I also- well, I was wondering if… It seemed to me like you were more ambivalent about the whole ‘Daddy’ idea than Katsuki,” he said leadingly. Shouto shrugged in agreement. “That’s just fine with me, love. But I wanted to offer…” 

Izuku gathered his courage. “Well, if it feels right, you could always call me ‘Sir’ instead. If you want,” he said, trying not to stutter. They hadn’t really talked about that particular dynamic since the initial debrief of that scene, and he wasn’t sure how hindsight might have changed Shouto’s outlook, especially now, when he wasn’t anywhere near subspace yet. 

The response was a rumbling, deep groan that went straight to Izuku’s cock, and the sigh he let out washed away all of his remaining nerves, replacing them with a heady confidence. “I take it you liked that idea?” he asked with a flirty smile, getting a firm nod in return. 

Trying to keep from squeezing Shouto too tight in his excitement, Izuku simply said, “Good,” and vented his happiness by rubbing his face against Shouto’s silky hair. Quieter, he confessed, “I still want to hear you call me ‘Daddy’ at least once while you’re in subspace, though. If you don’t like it, we can drop it, but could my sweet boy try, at least once? For me?” 

Izuku might have been laying it on a bit thick with his wheedling, but it was worth it to hear the affected tone of Shouto’s agreement. Even better was how it sent him squirming until he turned over and started kissing Izuku’s throat like he was trying to thank him for something. 

“My sweet boy,” Izuku sighed out liltingly, tilting his chin to invite more of the little licks and nips he was being given. He sat there peacefully for a bit, indulging in the simple pleasure of Shouto’s necking and letting it fuel more potential Plans that were so indulgent they felt more like daydreams. 

When he heard the shower water shut off, Izuku knew he needed to set the scene before Katsuki came back. He tapped Shouto’s flank gently. Thankfully, he understood the signal, so Izuku didn’t have to push him away. He boosted Shouto into a more upright position and moved him where Izuku wanted him to sit. 

He only realized after that he was being rather presumptuous with his manhandling, but Shouto went with it easily and looked perfectly content. With a fond kiss to his brow, Izuku said, “Alright, honey, it’s time. I’m going to put Katsuki in headspace first. Do you want to join in once I’m done, or would you like to sit back and watch for a bit first?” 

Izuku figured that until Shouto gave him some indication of his preference, it couldn’t hurt to give him Options. Shouto considered his choices and then asked quietly, “Can I… help? Somehow?” 

Ah. He should have known. Of the three of them, Shouto was definitely the most service-oriented when he wasn’t the one in charge. “I think I can figure something out, yeah.” Just to check, Izuku asked, “Do you want to just be my helper for now, or is this part of being my sweet boy?”

Shouto looked so cute and disheveled already, and Izuku couldn’t help but thumb away the little damp patch on the side of that pouty, reddened mouth. Shouto's eyes softened, and he leaned into the touch. “Your sweet boy.” 

Izuku tried not to get too unbalanced by the devoted certainty in his tone and recentered himself by remembering the Plan he’d set into motion. “Alright, then. Be good and sit still for a bit, and I’ll let you know how you can help soon,” he told Shouto. What that would be depended on Katsuki’s reaction to what Izuku was about to do. For now, Kacchan was about to come back, and he had a scene to set. 

Izuku set his lips against Shouto’s cheek, letting the sweetness of it stretch long enough that he could hear the soft sound of footsteps pause. There, that should be a good way to say without words that he’d kept his word, but still be a tempting sight. 

Speaking of tempting sights, Katsuki had apparently forgone the towel, and when Izuku pulled back, he was greeted with an unbroken display of skin that made him want to pounce. That wasn’t the game they were playing today, though, so Izuku sat back instead and coaxed Kacchan closer. 

“Come here, baby, I want to give you a kiss, too,” Izuku called, reeling him in to do just that as soon as he was within reach. With practiced precision, he pulled Katsuki onto his lap with subtle touches and a passionate kiss that acted both as a distraction and an enticement. 

Kacchan felt more submissive in certain positions than in others, especially if the position wasn’t his own idea, and would resist being put there if he was allowed to think about it for too long. Once he was in that position, though, it was infinitely easier to get him nice and floaty, and Izuku was shamelessly exploiting that fact. 

Katsuki groaned heartily into the kiss and relaxed into the straddle without a fuss, filling Izuku with a smug satisfaction. “Good boy,” he praised, the words coming out more purring than Izuku had intended, but he liked the way it made Kacchan kiss him like he was starving. 

Izuku fanned those flames up high before pulling away at the apex, and watched with a mischievous delight as Kacchan squirmed at the sudden loss. After a bit of indulging, he pet Katsuki’s sides to help him settle himself. 

“Hello, baby,” Izuku said sillily, as he admired the pretty flush that had spread over his baby’s cheeks and beyond. “Are you excited for this?” 

He knew Katsuki would resent the teasing, but if he was honest, Izuku liked poking his buttons. Not just because the glaring pout he received in return was adorable, but because it so diametrically opposed the way they had been Before. It never failed to send a little thrill through him to know that he was allowed this now. So Izuku, when Katsuki retorted with a snide “What do you think, Deku?” …went a little feral. 

With a faux-considering hum, Izuku adjusted the hands that had drifted down to Katsuki’s restless hips and stopped their rocking with a firm grip. “I think,” he drawled smugly, “that that’s not the name you want to call me right now, is it?” He put just an edge of authority in his tone, testing the waters. 

If Kacchan had balked, Izuku knew he’d need to back off and slow down. That wasn’t what happened, though. Instead, Katsuki’s wriggling redoubled as he practically started to pant in arousal. As exhilarating as that was, it wasn’t what Izuku was after, not yet, so he waited. He was rewarded when, after a few moments of frustrated struggling, Kacchan surrendered to the hold and pleaded sweetly, “Izu, fuck, come on…” 

Normally, that capitulation would have him melting into charmed goo, but some gut instinct told him there was something More simmering under the surface of Katsuki’s blatant arousal. Seeing that, Izuku took a gamble and kept his cool, only giving a mild reward of “Better,” before hinting, “though not quite what I had in mind.” 

Katsuki froze in his hands at the implication in his tone, and then his eyes snapped wide, and a shiver ran through him from head to toe, with a bright red flush quickly chasing after it. The visceral reaction had Izuku suppressing a broad, gleeful grin. Oh, this was going to be so much fun. 

Katsuki’s jaw worked soundlessly like the words were stuck there, and with reckless abandon, Izuku prodded him with a goading taunt. “What’s wrong, sweetheart? Are you feeling shy?” 

Predictably, Katsuki stiffened and barked out indignantly, “No, I’m not fucking shy! I just-” 

Izuku didn’t let him finish, yanking the back of his hair hard enough to flirt with the edges of Kacchan’s limits until he was bent back beautifully, his chest and neck exposed and straining against the hold. Izuku only softened his grip a bit once they’d reached a tenuous balance. 

“Fuck- shit. Motherfucker, goddammit,” Katsuki whined out breathlessly to vent the sudden pain. 

Izuku waited patiently for him to wear himself out, and then intentionally set free the crooked, smug smile that had been tugging at his mouth ever since he saw how easily this was riling Kacchan up, even more than their usual horniness. “Ah, I understand now,” he commiserated with the condescending tone that drove his prideful boy crazy. “My pretty baby needs some help getting down before he can be Good for me like he wants, isn’t that right?” 

Katsuki broke, shattering and spilling into Izuku’s cupped hands with a sinful moan. There was a rush of triumph, swiftly followed by a wave of loving awe that swept through Izuku at the trust he was granted. “That’s it, sweetheart, just like that,” he praised softly, gathering the limp bundle of boy in his lap closer to support him. 

Katsuki let himself be moved, and Izuku cooed, “Look at you, baby, you’re being so good for me, letting me hold you. Come here, pretty boy, let me kiss you.” 

The request had Kacchan tilting his head sweetly, letting Izuku claim him with a steady confidence that seeped into the core of him until it no longer felt like the facade it had started as. Within his own mind, he settled into the knowledge that this was something Katsuki Wanted, with Izuku specifically, and more than that, that Izuku Wanted it too, wanted to hold and baby and ravage the boy in his arms with all the care in his too-big heart. 

Knowing now that Kacchan would be more than willing to answer, he asked, “Now, will my baby boy tell me what he wants first? Anything you want, love, we’ve got all night.” After all, what Izuku wanted most right now was to spoil him, both of them if Shouto let him, rotten. 

Shock flashed over Kacchan’s face. It threw Izuku for a moment, until he mentally played back his words and registered the change he’d made to the habitual pet name that had started all of this. Oh. Well, from the way Katsuki’s throat clicked around a dry swallow, it wasn’t an unwelcome one. 

“Wan- Wanna suck you,” Katsuki managed to say. There was an odd hesitance in his expression, though, and Izuku recognized the way Kacchan curled into himself when he wanted to say something but found it too embarrassing. 

Well, there was something Izuku could do about that, at least. Katsuki’s inhibitions basically disappeared when he was in subspace, and considering how far down he’d gone already, Izuku was fairly confident he could lean into it and coax out whatever he was holding back. He leaned in, straightening his spine enough to actually be a little taller than Kacchan despite their position with how he was folded in on himself. 

Letting him hold himself smaller, Izuku merely nudged his chin up until red eyes looked up through his eyelashes to meet his. Izuku’s lips curled into a small smile at the sight, and he asked as temptingly as he could, “Is that all, or did you want to ask for something like a Good Boy?” 

He could see the moment Katsuki’s walls broke, even before the high-pitched whimper reached his ears. What drove the breath from Izuku’s lungs, though, were the words that followed, the tone whiny and almost childish. “Please, Daddy, fuck my mouth. Wanna be Good.” 

Shouto echoed his affected gasp, and when Izuku glanced over, he looked utterly entranced, his eyes wide and his face cast in a study of wistful Want. He wasn’t sure yet what part of this had Shouto yearning, but any of the possibilities were wonderful, especially the likely scenario that he wanted the same treatment Katsuki was getting. 

The thought, along with Kacchan’s easy surrender, had Izuku riding high with a feeling he could only compare to the moment in a difficult villain fight when he Knew he would win, when every path left available led to victory and success. It crashed over him like a wave, and he pulled Katsuki into a hungry kiss in an attempt to channel it. 

His voice wavered between lust and blissful awe as he answered. “Fuck, baby. So Good for me. Yeah, I’ll fill that pretty mouth of yours as much as you want. Want to spoil you rotten, sweetheart,” Izuku confessed.

“We’re going to take such good care of you.” With a bright grin, he turned to Shouto and said invitingly, “Aren’t we, sweet boy?” 

He nodded happily, perking up adorably at Izuku’s acknowledgement. His smile softened, and it prompted an even cuter blush from Shouto. Now, to put his Plan into motion. “Could you please go get a cushion for Katsuki, honey? He looks so pretty on his knees, after all,” he murmured, the words throaty with his own Want. 

Shouto followed the instructions, and Kacchan took off like a horse to a starting gun as soon as the cushion was laid down. Before he could start, though, Izuku caught his hands by the wrist. “Hold on, baby.” Kacchan’s palms were almost dewy with the explosive sweat of his quirk, but he must have been too spacey and distracted to register it. 

“First, Shouchan, could you come sit behind me?” Izuku requested. Shouto did just that, looping his long limbs around Izuku and holding him with obvious care. 

With a happy kiss to his cheek, Izuku turned his attention back to the boy kneeling at his feet. Katsuki seemed dazed, so Izuku called his name softly, not wanting to startle him, and asked, “Sweetheart, could you clear your palms for me, please? Quick is good, but quiet is better.” 

Kacchan blinked and then flashed a small, chagrined smile up at him before he turned his concentration to the familiar, gentle crackling of his palms. He was still twitching restlessly, though, so Izuku slipped two fingers into his pretty mouth. Sure enough, Katsuki settled, sucking absently in a self-soothing habit. 

Fondness filled Izuku’s chest like cotton fluff. Kacchan was so cute sometimes, and it was delightful. Still, he had a Plan to advance. Gladly using their situation as an excuse to get Shouto’s hands where he wanted them, Izuku asked him, “Honey, could you please help me with my buttons? Our hands are a bit occupied at the moment.” 

Shouto purred, deep as a jungle cat, at the appeal, with a rumble Izuku could feel, and he leaned further into it with an almost overwhelming satisfaction. That satisfaction only compiled as graceful fingers drifted directly to his groin. He’d meant his shirt buttons, but he certainly wouldn’t complain at Shouto’s eagerness, especially when those clever hands slipped beneath the fabric to cup his sensitive bits indulgently. 

It was only when they gently squeezed that Izuku registered how soft he still was. Huh. He’d gotten so much enjoyment out of this so far, but he hadn’t realized that wasn’t necessarily a sexual feeling. The banked coals of his arousal started to flare at Shouto’s playful touch, though, and the twin pleasures twined together wonderfully. 

Half by accident, the fingers in Katsuki’s mouth slipped deeper, pressing down on his plush tongue and reminding Izuku of what was to come. Heat flashed through him, and only a second later, his anticipation broke as he heard Kacchan’s palms go silent. Eagerly, he popped the digits from between his lips. 

Even knowing it would happen, the sudden heat enveloping his cock provoked a gasp. It was echoed by Shouto’s own sharp breath in, but Izuku was distracted from figuring out why by the buzzing stimulation of Kacchan moaning around him. Heat flared in his stomach, and Izuku let out an obscene noise, soaked in pleasure from the combination of Katsuki’s mouth and strong arms holding him as he arched back. 

Praise fell from Izuku’s lips, both for the way Katsuki was gently sucking at him and how Shouto, brilliant boy that he was, moved his hands up to undo Izuku’s shirt buttons. Out of hedonistic impulse, he cupped the back of Katsuki’s head and held him down, not wanting to be away from that sinfully wet heat for even a moment. 

His cock filled steadily until it eventually hit the back of Kacchan’s throat. He gagged, and Izuku waited watchfully for any signal that Katsuki wanted to tap out, but other than the instinctive jerking back, his baby made no move to tell him no. Something heady and hungry filled Izuku at the helpless whine when Katsuki was made to keep his lips pressed to the root of him, even as his throat spasmed and clenched around Izuku’s still-swelling cock. 

Teary, pleading eyes looked up at him, but they found no mercy in him. Something primal and dark had overtaken Izuku just then, and he wanted to know just how long Kacchan would let him fill and choke him like this. For a long moment, they stared at each other until Katsuki’s gaze drifted to where Shouto was watching over Izuku’s shoulder. Whatever he found there broke the last of his resistance, the tears spilling over. 

Again, Izuku watched expectantly for Kacchan to tap out, just in case, but instead he relaxed all at once, letting Izuku go impossibly deeper as he gave himself over to the hold. Heart full, he said proudly, “Good job, baby, you did so good. I knew you could do it, Katsuki.” Kacchan could do anything if he set his mind to it. It was only ever a question of whether he would decide to do so. 

“I’m so proud of you, baby boy, you’re amazing. Just a little longer, sweetheart, and then I’ll let you up,” Izuku assured him. As much as he wanted to stay, his baby boy still needed oxygen. “So Good for me, my baby, so precious.” 

A fragile joy splashed over Katsuki’s face, and finally, finally, he let himself go fully down with a sob. Izuku held him through it, happy to be the support and bulwark Kacchan needed. He’d look after Katsuki’s physical body, keeping an eye on his color and strength to know when to let him breathe, while Kacchan did the hard work of letting himself break down and cry everything out. 

As he did that, Izuku watched Shouto’s hand reach out and tenderly brush away the tear tracks. In a gesture too sweet for words, Kacchan peacefully closed his eyes and rested his cheek in the curve of that offered palm. Shouto’s breath stuttered, and he hid his face in the safety of Izuku’s shoulder. 

Remembering that he hadn’t yet witnessed this particular aspect of Katsuki’s submission, Izuku tilted his head to tuck Shouto further under his chin in an effort to reassure him. “It’s okay, sweet boy, I’ve got him, I promise,” he said quietly, not wanting to disrupt Katsuki before he was ready. 

Shouto squeezed him tightly in thanks, disregarding the dampness still clinging to his fingers. The shift caught Kacchan’s attention, however, and his eyes blinked open. Now that the moment had passed, Izuku pulled him up. After a few quick, deep breaths, though, a worried furrow crinkled Katsuki's brow. Before Izuku could ask, Kacchan was pulling Shouto’s other hand close and shifting briefly off to plant a gentle kiss on the curved knuckles. 

Shouto’s breath went even more ragged, and Izuku realized that it had never quite steadied since Kacchan started crying. His baby boy was already on it, though, directing Shouto to lay his hand over Izuku’s. Seeing where he was going with this, Izuku moved to let the warm hand rest over Kacchan’s scalp before laying his own overtop. 

At the silent encouragement, Shouto’s grip tightened and pushed Katsuki deeper onto his cock once more. Izuku sighed in relief at the renewed pleasure and turned his head to kiss gratefully at the first place he could reach. “So good to me, love. Make us both feel good, won’t you, baby?” Izuku urged with a whisper. “I know you want to. I trust you, sweet boy.” 

He heard a soft gulp. Katsuki blinked in a signal of permission up at them, and after a deep breath, Shouto moved again, small movements that were more tease than sensation at first. Still, Izuku let him go at his own pace, and soon they built up to a satisfying rhythm. 

Arousal tugged like a fishhook behind his navel as Izuku fully registered how his precious boys were surrounding him and treating him so well. It was so sweet, how careful Shouto was to stop at even a hint of gagging from Katsuki, but Izuku knew he was fine and was far too pent up to be patient, so he pressed down on Shouto’s hand insistently. Thankfully, he complied, and even better, he took it as a signal to go deeper, forcing Katsuki to swallow around Izuku every time. 

It felt like heaven to Izuku’s overheated nerves. Far past the point of filtering his words, he crooned down to Katsuki, “Look at you, sweetheart, so fucking pretty for me. Both of my boys are treating me so well. Feels so good, love, can’t get enough of your mouth. I’d say you’re spoiling me, but I think we both know who’s really getting spoiled here.” 

The wholehearted agreement in Katsuki’s eyes sparked a playful mean streak in him, and Izuku couldn’t resist teasing him. “Shouto’s being so nice to you, isn’t he, baby? Fucking your face all sweet like that, without even getting to feel my baby boy’s slutty throat.” He made a showy tsk at that, and the corner of his mouth ticked up. “Do you want to show him how Good my gorgeous, slutty baby boy can be?” 

Katsuki’s flexing pupils and frantic swallowing were gorgeous, but what pushed Izuku's smile to bloom into a full-blown smirk was the wave of sauna-like heat against his back, followed by the rigid thickness of Shouto’s erection pressing against his tailbone. 

“Yeah, I thought so. If he’s even a little meaner to you, you’re going to come without a single touch, aren’t you, sweetheart?” he asked, both to get the barbed embarrassment from Katsuki and to clue Shouto into exactly what Izuku meant by ‘how slutty he could be.’ Half-flirting and half a check-in, he added, “Do you want that?” 

The tightening around his cock that would no doubt have been a whine and the plaintive pull at his waistband were more than enough of an answer for Izuku. Apparently, it was enough for Shouto, too, because after that, he stopped giving more than the barest consideration for Katsuki’s ability to breathe with a cock down his throat. 

The added onslaught of pleasure for himself had Izuku sucking in a breath through his teeth, and Shouto’s hold on him shifted to something that radiated a giddy self-satisfaction. At that, Izuku set aside any pretense of being disaffected and started to match their tempo with short thrusts of his own. 

The added force must have been the last straw for Katsuki, and with awed eyes, Izuku watched as his baby boy came around his cock from nothing but having his face fucked. It had happened a few times before, but it still left him blown away every time. He had just enough brainpower to spare that he remembered Katsuki had told him what felt best when he did this was to be denied air until the aftershocks had passed. 

Izuku had never been more grateful for how compatible they were like this as he shoved his cock as deep as he could go and held them there, feeling every clench and spasm as Katsuki flailed through what looked like an absolutely transcendent orgasm. 

Reluctantly, Izuku pulled out of that wet tightness once the waves of tension collapsed into lax bliss. It was difficult to do gently when he was still so on edge, but Shouchan helped him, handling Katsuki with a cautious tenderness.

As reassurance for… all three of them, really, Izuku gathered Kacchan’s tired frame into his arms and then his lap. (He had to do a quick bit of sleight of hand to tuck himself away enough to be comfortable, but it was more than worth it.) 

Shouto’s longer wingspan was a blessing, allowing him to wrap his arms around both of them firmly, despite neither of them being what anyone would call ‘small.’ Not that Katsuki wasn’t trying his damnedest right now, tucking himself into Izuku in a way that made his chest ache with the overwhelming cuteness. Even more of a blessing was his quirk, which Shouto activated, providing a wash of coolness just as Izuku felt his skin start to prickle with sweat. 

He let out a hearty sigh of contentment, and Katsuki gave a pleased hum despite his currently wrecked vocal chords. After a few moments to just bask in the multi-layered embrace, Izuku turned over his shoulder to address Shouto, whispering so he wouldn’t disturb Katsuki’s afterglow. “Shouchan, love, you did so well. Could you go sit up by the pillows for me? I want to get Kacchan situated somewhere more comfortable.” He glanced back at the boy in question with a sappy smile. “He’s more than earned it.” 

He really had. Izuku knew how much work it had taken for Katsuki to even admit he wanted things like this, much less actually allow himself to let his guard down enough to fully enjoy it. He was so, so proud of his prickly boy for being able to show his softness so readily now, and honored to be the person trusted to bring it out. Even more, Kacchan had opened up to Shouto while in the throes of it, letting him not only witness his undoing, but be an active participant. 

Shouto was slow to let go of them, which Izuku couldn’t blame him for, but he did as he was asked. In return, Izuku made sure he wasn’t alone for any longer than necessary. He passed Katsuki over to Shouto as soon as he was settled, letting him hold their still blissed-out boyfriend while Izuku handled the more practical aspects of their aftercare routine. 

On his way to gather the cleaning supplies, he shucked off the last of his rumpled, unfastened clothes. He’d long lost all shyness about being naked around his boyfriends, and in general, he preferred it as long as the door was locked. It was more comfortable, if nothing else, with how One for All made him always run a little hot.

And it wasn’t like they ever complained. (Well, Shouto had, but that was because they were studying and he was “being too distracting,” so Izuku didn’t count it.) Sure enough, neither of them seemed surprised by his bare body when he came back. 

He set aside the rest of the things and, armed with a damp rag, Izuku cleaned up the splash of cum on Katsuki’s splayed thighs. Somehow, in the brief time he’d been turned away, Kacchan had draped himself over Shouto’s whole front. Their legs were tangled together, Katsuki’s arms thrown out to either side, and his cheek was pressed over Shouto’s heart. In return, the taller boy’s arms were wrapped firmly around his torso, one cinching his waist and the other hooked around his lower ribs to span across to the opposite shoulder. 

Full of fondness, Izuku tossed the dirty rag into the laundry basket and followed Katsuki’s example, lying face down overtop Kacchan. Both of them made happy noises at the ‘Squishing,’ as they called it. Izuku laughed under his breath at the thought that no one would ever believe him if he tried to explain to someone else how adorable his partners could be. 

“My cute boys,” he declared contentedly. Shouto hid his face shyly in the top of Kacchan’s hair at the comment, but Izuku could see the charming pink at the tips of his ears. Katsuki wriggled slightly under him, so Izuku checked in. “How are you feeling, baby? Are you ready for more, or do you want to take a break?” 

In typical Kacchan fashion, he eschewed words and responded by tilting his ass up and rubbing himself directly against Izuku’s stubborn erection. It provoked a delighted laugh from him. “Alright, alright! Oh, baby boy, what am I going to do with you?” he asked with teasing exasperation. 

“Fuck me?” Katsuki suggested cutely, voice raspy but hopeful. Izuku snorted at the shameless flirting, and he heard the huffing of Shouto’s quiet laugh join his own. The little victorious squeal that he hadn’t heard from Kacchan in years at getting Shouto to laugh was worth more than gold, and the chuckling gave way to a full-body softening that echoed Izuku’s own feelings. 

“Sure, baby, we can do that,” he agreed easily. That was already part of the Plan, anyway, so he didn’t even need to revise his strategy to accommodate the request. “Do you want it to be me that fucks you, or do you want Shou?” He had versions for each, both interesting in their own way. 

Katsuki made a thoughtful noise and then proposed blearily, “You fuck me while I suck Shou?”

Oh? Now that was something outside of his current outlines, but… Yeah, Izuku could adjust to make that happen. Imagining it, he grinned in anticipation. That would be so much fun, as long as he made sure Kacchan could tap out quickly if he needed. 

“Sounds good to me. What do you think, sweet boy?” Izuku asked, turning his head up to see Shouto’s face. 

He didn’t see the eager look he was half-expecting, though. Shouto looked dazed, his eyes unfocused, and not in a good way. “Oh. I- um. Yes. Yes, I can do that,” he said, despite the blank expression, the words flat and sluggish. 

Izuku frowned in worry, but Shouto didn’t seem to understand the reason for his concern, looking around in confusion before alighting on Katsuki. “Hmm?” 

Izuku wasn’t sure how to explain what was wrong, but as always, Kacchan cut straight to the heart of the issue. “You good, Shou?” he asked with a caution that meant he’d heard how off Shouto sounded, too. Izuku couldn’t put a finger on what it was, but he felt like he had seen Shouto do this before, and his gut said that wasn’t a good thing. 

He blinked in response, the surprise on his face even more muted than usual. “Why?” 

Izuku… didn’t quite know what to do with that. The far-away tone of the question still rang instinctive alarm bells in his head, but maybe he was just imagining things? No, if everything was fine, Shouto would have just said so. Usually, he only asked clarifying questions if he didn’t know how to answer without it. Was he trying to hide a bad reaction? That didn’t seem likely either, with how straightforward Shouto normally was. 

“You sound kinda out of it, s’why,” Katsuki explained succinctly while Izuku tried not to spiral in his worry and confusion. He squirmed in his spot between them until he could turn enough to meet Shouto’s eyes. “Now answer.” 

“Oh. Right,” Shouto said, startled like he’d forgotten about the question entirely. “I’m… not sure,” he finally answered, still distant, but with a tone of bewilderment leaking through. 

Oh. 

Izuku suddenly realized why Shouto had such a hard time with certain questions. It wasn’t that he didn’t like to answer; it was that he didn’t know how to. He really should have figured out before now that Shouto might not have much practice identifying, much less verbalizing, his emotions. That was definitely a thought for their Notebook, but for right now, Shouto needed to be taken care of, not analysed. 

“Honey, do you need a break?” Izuku asked gently, fairly sure of the answer. 

The distance in Shouto’s eyes broke at the question, but in the worst way. He looked… caught, panicked, and then desperate, trying to speak but nothing passing his lips, not even breath. Shit. 

Izuku felt helpless as he watched Kacchan soothe him, guilt gnawing at his stomach. Something must have happened, but he had no idea what, and he hated the idea that he might make Shouto’s distress worse. 

“Hey, hey, just breathe, Snowpea. We’re not going anywhere, okay?” Katsuki murmured comfortingly. 

Izuku would have thought it was just a general platitude if Shouto hadn’t broken through his wordlessness enough to try to refute it. “But-” he said, voice strained and cracking. 

Wait. Did he think… “Oh, sweet boy, no,” Izuku argued, the words bursting out of him. “The break would be all of us, promise.” At that, Shouto froze and then melted underneath them in the span of a breath, the relief painted in vibrant color on his face in contrast to the earlier stillness. 

Izuku smiled softly. He was feeling much better himself, now that he had found the most recent issue and fixed it for his sweet, needy boy. Shouto must have been further into his own headspace than Izuku had thought for that worry to cause a drop like that. “Oh, honey,” he cooed, heart soft. “We’ll always wait for you if you need us to. You’re Ours, remember?” 

A vulnerable look came over Shouto briefly, and then Izuku was being pulled into an insistent kiss that felt more like a sob. He went with it, letting Shouchan get his feelings out through lips and teeth and tongue. While Izuku helped him through it, Kacchan nudged him up enough to flip himself over, flopping in contentment once he was able to lie flat while shoving his nose under the crook of Shouto’s jaw. 

A charmed laugh bubbled up from his chest because, while Izuku was almost entirely sure Katsuki hadn’t done it on purpose, his ass was now pressed directly against his cock. He rocked his hips against him to point this out. He wasn’t expecting to cause Shouto to make a reedy whine into their kiss in response. He wouldn’t complain, though, especially when it prompted an equally horny noise from Kacchan in return. 

It was tempting to let that draw them back into their earlier frenzy, but he wasn’t going to take that chance until he was sure Shouto had recovered from his drop. If Izuku could get a check-in or, better yet, a debrief, that would be great. Until then, he continued to soothe Shouto with kisses. 

When Shouto’s breath was no longer labored and ragged, Izuku shifted off of the two of them with the vague idea of getting them seated upright. He tried to get Katsuki to do the same, but he refused, settling firmly into Shouto’s chest. He tried a couple more times to urge him up, but gave up when he felt a wave of gentle warmth coming from Kacchan’s designated pillow, followed by a happy moan from Katsuki and him smugly bedding down even further with Shouto’s tacit approval. 

“Spoiled.” Izuku’s voice was one part accusatory, two parts amused, and one part helplessly fond. Somehow, Kacchan managed to radiate smugness from his every pore without moving a muscle at the capitulation. Shouto met his gaze and smiled back, looking very content with his situation. 

Izuku sighed and settled onto his side, propping himself up enough that he could keep an eye on Shouto’s face. He was still wary, not wanting that opaque blankness to come back, especially when he still didn’t know the cause. Shouto may not have known what the feeling was, but he had definitely been feeling something. 

Keeping his new knowledge in mind, Izuku asked in his Quiet voice, “Are you feeling up for a check-in now, Shouchan, or do you want a bit more time?” 

Shouto gave him a grateful smile at the question before nodding, and Izuku resolved to stick to binary questions as much as he could. “Have you been able to figure out anything more about how you’re feeling, love?” 

He shook his head with a frustrated sigh. Izuku’s mouth twisted in sympathy. The panic attacks that he couldn’t figure out a 'why’ for were always the worst to deal with after. “That’s alright, sweet boy,” he told Shouto. “Do you want to do a mini-debrief and see if that helps?” 

“Okay,” Shouto said falteringly. He tried again, steadier this time. “That sounds good to me.”

“Then we’ll do that,” Izuku agreed. He thought for a moment, then asked, “I know you asked to help when I talked to you last. I think you did great, but did it make you feel good?” 

Kacchan gave a little “Hmm?” at that, and Izuku made a mental note to fill him in on the briefing they’d done when he got a chance. 

After a pause, Shouto said, “Yes, I liked being your assist very much. It’s… It’s not everything that I want, but I do like it.” 

That was more than reasonable. None of his plans included not having Shouto be the focus at least some of the time, so Izuku wasn’t too worried about that. The way he referred to it as an ‘assist’, like it was a team placement for a hero mission, was interesting, though. 

Izuku could investigate the implications of that later. For now, he asked, “What about sitting behind me and watching, did you like that?” 

“Yes,” Shouto said eagerly, before clearing his throat and repeating, “Yes. I like hugging you, and- and watching.” The pretty blush that bloomed on his cheeks confirmed his words. Izuku’s ego certainly liked that answer, and Katsuki liked it even more, exhibitionist that he was. If Shouto got more embarrassed, he might not be able to communicate as well, though, so Izuku refrained from teasing him (for now). 

Instead, he broached the event that he thought was the most likely source of the incident. “I know something happened before Katsuki kissed your hand, but thinking back, I’m not sure what it was…”

The confusion returned, but thankfully that stomach-clenching blankness was nowhere to be found. “I think… There were a lot of Feelings,” Shouto started, speaking slowly and carefully. “And I. Got overwhelmed?” The uncertainty in his voice lessened as he continued to talk. “Not from Too Much, though, so… Not Enough? I don’t know how that would work, but that sounds right.” 

Izuku tried to piece that together with what context clues he had. ‘Not Enough’ was usually when one of them was keyed up and not getting the stimulation they needed, but that didn’t fit. Shouto said there were a lot of Feelings, so maybe… he meant that, but with emotions instead of sensation? 

“Looked lonely,” Katsuki rasped, giving Izuku the last piece of the puzzle. If Shouto had been needing emotional support, and he was behind Izuku with no one looking at him directly… The disconnectedness made somewhat more sense. Had he felt like that the whole time?

Before Izuku could spiral too badly, he saw how Shouto’s eyes softened, and he hugged Katsuki, who bit at Shouto’s earlobe with lazy affection. Okay, so what Kacchan had done must have helped, even if it hadn’t fully resolved the issue, unless something else had happened in the interim that Izuku wasn’t seeing. 

Either way, he’d like to be able to not just help, but prevent that from happening in the future if he could. “Did it feel like you needed more Touch than you were getting, or was it more about us paying attention to you?” Those had similar, but distinct, solutions, so it was better to know now. 

Shouto considered. “Both, maybe?” he answered, unsure. Quieter, he added, “You two love each other a lot. It’s easy to forget I can do more than watch.” 

Oh. 

Izuku’s eyes stung with tears as he figured out what that blankness had been, and why it had caused him so much dread. It was Shouto leaning back on old habits, hiding away his care so he wouldn’t Want too much. That’s why it had looked so eerily familiar. 

He was going to have to process that revelation more fully later, but for now, he laid a protective kiss on Shouto’s brow, like a talisman to chase the doubts away. “And we love you a lot, too, sweet boy. You’ll see,” Izuku declared with a core of steel in his voice. He and Katsuki would put in the work to make sure he saw and understood. 

The first step to that was figuring out how to address the current situation. He knew that Katsuki letting Shouto control his movements helped. If Shouto needed to be in control right now to feel secure, Izuku would do it. He… He hoped not, because that would mean scrapping his plans and risking their experiment being remembered as a failure when Izuku had such high hopes, but if that was what Shouto Needed, he would do it. 

“Did us giving you control help the feeling at all?” Izuku asked first, before he started ransacking his mental web of Plans just yet. He couldn’t quite keep the reluctance out of his voice, but hopefully that wouldn’t be enough to skew Shouto’s answer. 

“A little,” Shouto replied with a shrug. “I liked it, but it was mostly being part of what was happening that helped. I still want you to be in charge today.” 

The last part was said with weight behind it, and Izuku couldn’t tell if it was because of Shouto’s own Want, or because he had seen through the paper-thin facade of his attempt at neutrality. Either way, it brought a grateful smile to his lips. 

With just enough flirtiness for plausible deniability, he asked the next important question. “Still up to try calling me Daddy?” 

“Yes,” Shouto said, quick and throaty with a suppressed eagerness that surprised Izuku. That reaction, along with his flaring pupils, was a far cry from the shrugging ambivalence he had started with. Was seeing him with Katsuki really enough to inspire that much interest? 

Apparently so. Izuku drew Shouto into a celebratory kiss, grinning broadly. This night had already given Izuku so much. He couldn’t wait to see what else was in store for them.

The possibilities spiraled out in his mind, bright as galaxies. After all, he'd already gotten so many things that he'd thought would never be more than dreams. What was the harm in trying for a few more?

Chapter Text

“Alright, alright! Oh, baby boy, what am I going to do with you?” Izuku asked, voice slightly exasperated and soaked in fondness.  

“Fuck me?” Katsuki suggested hopefully. 

This time, Shouto joined Izuku in his laughter. It was just so… Katsuki. He didn’t seem to mind, at least, judging by the happy chirping noise he made.

“Sure, baby, we can do that,” Izuku answered, airily indulgent. “Do you want it to be me that fucks you, or do you want Shou?” 

Wait, what? That was an option? Before Shouto could fully process that offer, Katsuki answered with some lingering slurred sleepiness, “Hmm. You fuck me while I suck Shou?” 

Izuku grinned. “Sounds good to me. What do you think, sweet boy?” he asked, mind-bogglingly bubbly in a way that should have been more incongruent than it was. 

“Oh.” Right, Shouto had been asked a question. “I- um. Yes. Yes, I can do that.” He was still reeling a bit from everything that had happened already, but if that was what Katsuki wanted, he would do his best.  

Something about that answer made Izuku frown. Had Shouto said something wrong? No, that was Izuku’s ‘concerned’ face. Did something happen with Katsuki? Shouto checked on the splayed-out boy on his chest, but he seemed just as content and blissed out as before. No, wait, Katsuki's brow had gone all scrunched up now, too. 

Shouto made a questioning noise, more to Katsuki than Izuku. Izuku was lovely and wonderful, but he was not great at giving information succinctly. Predictably, Izuku was still thinking through his words while Katsuki asked, “You good, Shou?” 

Him? Wait, were they worried about Shouto? “Why?” 

The blond squirmed a bit, trying to get a look at Shouto’s face. “You sound kinda out of it, s’why. Now answer,” Katsuki insisted. 

“Oh. Right." Shouto did his best to figure out why they thought he was acting off. When he couldn't find an answer, he backtracked to trying to see how he was feeling in general, and still- nothing.

"I’m… not sure,” Shouto admitted, feeling a bit lost. That… probably wasn’t good. He tried harder to figure out what was going on, why he felt so disconnected from himself, but the more he scrambled for understanding, the worse it got. 

Izuku levered his shoulders up to see him better. “Honey, do you need a break?” he asked gently. It was so, so kind, but Shouto froze. He did, but... He didn’t know- But they still wanted- Would they just keep going without him? He didn’t want that. 

It was only when Katsuki started rubbing circles on his chest that Shouto realized he’d stopped breathing. He hastily pulled in some air and tried to find the right words. There had to be something he could say to convince them to keep letting him do this, right? He just had to think of it, but his mind was frustratingly blank. 

“Hey, hey, just breathe, Snowpea,” Katsuki reminded him again. “We’re not going anywhere, okay?” 

“But-” Shouto tried, and it sounded ragged even to his own ears. 

Izuku blinked like he did when he just figured something out. “Oh, sweet boy, no. The break would be all of us, promise,” he said consolingly. 

…All of them? They wouldn’t-? Oh. Of course they wouldn’t. Shouto didn’t know what he’d been thinking, but it seemed very silly now. Izuku ran his hand through his hair soothingly while Katsuki ran his hands over him in broad strokes, and Shouto melted under their combined touches. 

“Oh, honey,” Izuku cooed, sticky and fond. “We’ll always wait for you if you need us to. You’re Ours, remember?” 

At that sweet declaration, Shouto reached out and pulled Izuku down for a kiss so he wouldn’t cry. He went easily, and Katsuki used Izuku’s changed position to wriggle between them until he had flipped over and was able to nuzzle into the crook of Shouto’s neck.

Izuku huffed a laugh into Shouto’s mouth at the antics, and then there was a rocking pressure over his hips. A shiver went through Shouto when he figured out what must have happened, and he made some kind of pleading noise. Katsuki made a similar noise back, but the kisses continued without further incident.

Shouto was pretty sure Izuku kept slowing down the kiss on purpose, keeping it calm and languid even when Shouto occasionally tried to pick up the pace. It was… nice, though. Cozy, like he was being swaddled with gentleness. 

It was only when Shouto’s breath had evened out and his heart rate had settled that Izuku pulled away, rolling to the side until he was fully off and curled around them both. Katsuki had no such inclinations, though, staying firmly on top of Shouto with the possessive stubbornness of a cat with a perfect spot to nap on. 

Feeling incredibly fond, he put out a gentle warmth so Katsuki wouldn’t get cold without his clothes on. The boy proclaimed his contentment loud and clear, making a frankly indecent sound and burrowing closer. Izuku watched them with a small, amused smile. “Spoiled,” he declared, too happy to be any kind of reprimand. 

Shouto just smiled back, unashamed. He liked spoiling Katsuki, probably just as much as Izuku did. He didn’t make it easy most of the time, but that just made these little moments more precious. 

Light as a breeze and twice as gentle, Izuku asked, “Are you feeling up for a check-in now, Shouchan, or do you want a bit more time?” 

Shouto appreciated the option more than he could express, and the relief of it made it much easier to agree to start the talk he knew was coming. 

Izuku thanked him for it and then asked, “Have you been able to figure out anything more about how you’re feeling, love?” 

Sighing, Shouto shook his head. He knew he was feeling much better now, but he still wasn’t sure what had been happening before he started to panic. 

“That’s alright, sweet boy. Do you want to do a mini-debrief and see if that helps?” Izuku offered. 

That… might work. Shouto realized most of the last part of what they’d done had gotten a bit muddled in his head. “Okay, -”

He cut himself off before he could say ‘Daddy.’ He wasn’t sure if that was something that was still happening, since they were taking a break, and he didn’t want the first time he called Izuku that to be a moment like this, even if the care he was being shown brought the name to mind more than anything else had. The last thing Shouto wanted was for Izuku to think he was mocking it or something.

Skipping the whole tangle of what to call him instead, Shouto said simply, “That sounds good to me.” 

Izuku gave an approving smile that lit Shouto up inside. “Then we’ll do that. Hmm… I know you asked to help when I talked to you last. I think you did great, but did it make you feel good?” 

Katsuki had made a curious noise at 'asked to help', but otherwise stayed silent. Shouto thought, and then answered, “Yes, I liked being your Assist very much. It’s… It’s not everything that I want, but I do like it.” 

Izuku made an understanding sound. “What about sitting behind me and watching? Did you like that?” 

“Yes,” Shouto said, a little too fast. He cleared his throat and tried again. “Yes. I like hugging you, and- and watching,” he got out with only a minor flush to his face.

His breath stuttered when Katsuki wiggled on top of him in a way that he could only describe as ‘smug.’ There was no way to hide how that made him harder when Katsuki was lying directly on top of it, so Shouto didn’t bother, knowing he was probably opening himself up to a lot of teasing later. 

Izuku’s reaction was no less smug, but he moved on rather than gloating. “I know something happened before Katsuki kissed your hand, but thinking back, I’m not sure what it was.” He trailed off leadingly and looked to Shouto for an explanation. 

The trouble was that… Shouto wasn’t sure either. He knew he’d gotten overwhelmed, but- “I think,” he offered haltingly, “there were a lot of Feelings. And I. Got overwhelmed? Not from Too Much, though, so… Not Enough? I don’t know how that would work, but that sounds right.” 

“Looked lonely,” Katsuki added while Shouto was trying to figure out if he had missed something somewhere. The meaning behind the words stunned him. Katsuki had thought he looked lonely? Well… Shouto had felt that urge to touch more of them, to Connect. Did that count as loneliness? It was close enough, he supposed. 

The fact that kissing his hand and reeling him in had been Katsuki’s response to seeing that made Shouto feel all warm and gooey inside. He looped his arm around Katsuki’s waist and squeezed, putting out a little more warmth with his quirk to vent the wellspring of affection and gratitude. He got back some nipping at his ear, so he thought Katsuki probably understood what he meant. 

Izuku got a contemplative look in his eye. “Did it feel like you needed more Touch than you were getting, or was it more about us paying attention to you?” 

“...Both, maybe?” Shouto said hesitantly. And because Izuku had told Shouto to tell him things even when they might make him sad, he added, “You two love each other a lot. It’s easy to forget I can do more than watch.” 

Sure enough, tears welled up in Izuku’s eyes, but he did an admirable job of working past them to press a kiss to Shouto’s forehead. “And we love you a lot, too, sweet boy. You’ll see,” he promised. Katsuki concurred with a matching kiss to his sternum and then over his heart. Shouto wasn’t sure when Katsuki had managed to get his shirt mostly open, but the additional skin contact was heavenly, so he wasn't going to question it. 

“Did us giving you control help the feeling at all?” Izuku asked tentatively. 

Shouto answered as honestly as he was able. “A little. I liked it, but it was mostly being part of what was happening that helped. I still want you to be in charge today.” Izuku smiled at the last part, so Shouto considered that a win. 

Half-teasingly, Izuku asked, “Still up to try calling me Daddy?” 

Shouto’s emphatic “Yes,” came out a little strangled, and he was sure Katsuki felt the heat from his quirk flare before he countered it with his ice. The laugh he got after confirmed it. 

Shouto wasn’t sure why the thought was affecting him so much more now, in this quiet in-between time, when it had been only mildly interesting before. Then again, so much of intimacy felt hopelessly esoteric to Shouto, so he was more than willing to eschew understanding and just enjoy what was happening.  Besides, Izuku’s bright, delighted grin at his reaction was well worth any embarrassment or confusion. 

For a while, Izuku and Katsuki just took turns kissing him, until Shouto was happily lost in the warm haze of it. He had no idea how much time had passed, but it was a long time. Katsuki was currently being very greedy with his turn, biting Shouto’s lip whenever they needed to take a breath instead of letting Izuku swoop in like they had been doing. 

Izuku must have lost the last of his patience, because the next thing he knew, Katsuki was being yanked away by the hair, and then a calloused palm was lying heavily on one side of his throat, Izuku’s thumb pushing Shouto’s jaw toward him so he could claim his turn. 

The firm weight against his neck sent zaps of electricity through Shouto, and he tilted his head up in an instinctual response to the pressure. Unbidden, a high, desperate whine escaped from his mouth, and his legs splayed under Katsuki’s blanketing weight. Shouto heard him hiss through his teeth, but the way Katsuki’s hips rocked against him told him it wasn’t a complaining sound. 

Even more fascinating, though, was Izuku’s response. He abandoned the kiss in favor of looming over Shouto with keen eyes, but the hand… the hand stayed. The wide, warm touch absorbed all of Shouto’s attention, and he swallowed under it. 

There was a crackling anticipation in the air as Izuku took on a predatory stillness. Achingly slowly, Izuku pressed down, watching Shouto’s face the whole time. He didn’t know what he saw there. Shouto only knew that his nerves burned while his mind had taken on a pleasant blankness. 

Whatever it was, it made Izuku stop increasing the strength of his grip and instead shift his hand forward, until his palm rested directly over the knot of Shouto’s throat and his thumb curled around the other side. Izuku’s hand around his neck, pinning him down under those piercing eyes and carrying the silent potential for violence, was all-encompassing. 

Those scarred fingers flexed. “Yeah?” Izuku said with a breathless hunger. Shouto nodded enthusiastically. If he was looking for permission, he had it. “You like this?” Izuku asked again, this time in a dark, crooning tone. 

“Yes.” Shouto’s answer was more than half-moan, but at least it was a word. 

Izuku’s hand pressed just a little harder in response, and his thumb brushed over the skin of his neck appreciatively. “Gorgeous,” he remarked with no small amount of awe. “So sweet, so Good for me, my sweet boy. Look how beautiful you are, Shouchan.” Shouto quaked at the raw devotion in the words, so thick that there could be no doubt. 

“You give me so Much, honey. It makes me want to Take all of it and more,” Izuku told him, his voice deepening to almost a rumble. And fuck, Shouto wanted that. He wasn't sure he'd ever wanted anything more. “Are you ready to show Kacchan how Good you can be, sweet boy?” Izuku asked, and Shouto melted under the onslaught, nodding with another plaintive whine. 

Izuku rewarded him with a kiss, and it was just enough that Shouto was able to suppress the urge to chase his hand when it lifted from his throat. The absence of the brittle-sharp clarity from Izuku's hand on his neck was filled with a rolling fog, soft and cool, but there was still one last prickling worry. Biting his lip nervously, Shouto turned to see Katsuki’s reaction to their exchange.

To his relief, those red eyes were wide and gratifyingly dark. Even better, his pretty mouth hung open in a pant, the heavy breathing clearly audible in a way that it usually wasn’t, even during their spars. Shouto smiled at the obvious appreciation on Katsuki’s face.

The full-faced blush that resulted was absolutely adorable, and pure joy bubbled in his chest at the knowledge that these men Wanted Shouto just as much as he wanted them, turning the haze in his head from white to the golden pink of a sunrise. 

After that, Izuku nudged Katsuki, trying to prompt him to move, but he nestled himself firmly around Shouto and complained loudly about having his comfortable spot disturbed. Shouto… admittedly didn’t do much to help, despite agreeing to whatever Izuku wanted to do just a minute ago, too charmed by how fiercely Katsuki insisted on remaining attached to Shouto’s middle by clinging arms. 

Eventually, Izuku backed off to regroup, assessing the situation. Changing tack, Izuku stroked a coaxing hand up Katsuki’s spine, soothing some of his feral defensiveness. “I know you’re comfy, sweetheart. Shouchan’s a wonderful pillow, I know. But, c’mon, baby, don’t you want to help me undress him?” he cajoled. “I bet cuddling him will be even better when he’s naked.” 

That at least made Katsuki look up from where he’d shoved his face into Shouto’s chest and refused to leave. It was also compelling for Shouto, who would much rather have direct touch than the slightly unpleasant texture of fabric.

“Come on, baby boy, didn’t you say you wanted to suck him? He can’t let you if he still has pants on,” Izuku argued, and Shouto could tell from the shifting tension in Katsuki’s muscles that it was at least having some effect. Why it was working, and why Izuku had chosen this plan of attack rather than seducing him on his own merits, was a mystery to Shouto, but it was certainly flattering. 

Continuing to stroke slow lines over the expanse of Katsuki’s exposed skin, Izuku added, “And you know as well as I do that keeping those thighs covered is a crying shame. If you get up, I promise you’ll get to have them around your ears at some point tonight.” 

Hm? Shouto wasn't sure what exactly Izuku meant by that, but the possibilities gleamed bright through the gentle fog that had been laid over his thoughts.

Katsuki perked up at that, and Izuku clarified, “In what way is up to Shou, but I know you can be very convincing when you put your mind to it.” Up to him? Shouto wasn't sure what the choices were, but the chances that he would turn down whichever one Katsuki wanted were incredibly small.

Katsuki made a skeptical noise in the back of his throat and looked at Izuku meaningfully. 

“Baby boy,” Izuku retorted as if he'd said a full sentence, fondly indulgent, “you have never, not once, needed your words to seduce me. Why would he be any different?”

Shouto was unsure why they thought they had to ‘seduce’ him into anything when he was so obviously wound around their pinky fingers, but it was a good point. Shouto gave an agreeing hum and poked Katsuki’s cheek, silently reminding him how often they communicated with no sound at all. Katsuki looked back at him in surprise, but when he processed what Shouto was telling him, he broke into a gleeful grin.

The sight was enough to have Shouto’s heart trying to jump its way out of his ribcage, presumably to present itself over to the pretty boy smiling at him like a kid who’d been given their favorite candy. It wasn’t the first time Shouto’s heart had done this, and it certainly wouldn’t be the last, but it still left him stunned for at least a second or two. 

Once he had recovered at least some of his senses, Shouto smiled back, stroking a hand over Katsuki’s flank fondly. He wriggled at the touch, slipping further down the bed until he was hovering over Shouto’s groin, and then aimed the textbook definition of bedroom eyes up at him. Shouto groaned at the sight, blood rushing to the area in question. 

Hands tugged at his waistband in silent question, and Shouto answered by lifting his hips to allow Katsuki to pull his trousers off. He did so with alacrity, barely bothering to undo the fastening button, let alone the zipper. The band pinched a bit at the tops of his thighs on the way down, but he couldn’t bring himself to care when Katsuki started nuzzling his cheek against Shouto’s cock as soon as one of his legs was free, the trousers dangling from one ankle. 

He gasped at the sudden stimulation, and Katsuki pulled back, opening his mouth wide but not touching, begging for permission with his eyes. Shouto started to nod, but then stopped. He really, really wanted to say yes, but Izuku was still in charge. 

Shouto looked over to the freckled man, and Izuku tilted his head in a fond smile. “So impatient, baby boy,” he chided Katsuki gently. “Go ahead, sweetheart. Just don’t make him come yet, okay? I have a Plan.”

Katsuki had already started moving at the words ‘go ahead’, so by the time Izuku had finished the instructions, he was making his agreeing hum around a mouthful of Shouto’s cock. The vibrations they caused had Shouto yelping from the unexpected influx of sensation.

In a fit of pique, he yanked on the hair he’d instinctively gripped when Katsuki had tried to swallow him whole. The blond only moaned at the hair-pulling, but Shouto was too distracted to try and find a different revenge. 

Katsuki’s cheeks hollowed as he came up, and it felt like he was sucking Shouto’s soul out through his cock. As much as he wanted to keep watching Katsuki, the urge to toss his head back became too strong, and a moan ripped through Shouto. For a little while, the only thing that existed in the world was the hair he was gripping like a lifeline and Katsuki’s clever, wet, soft, perfect mouth. 

He was briefly brought back to reality by someone grabbing his ankle. Shouto startled at the touch, but when he opened his eyes, it was just Izuku, freeing his trousers and underwear from the tangle around his ankle. “It’s okay, sweet boy, I’ve got you,” he reassured Shouto when he saw him staring, stroking his calf absently before peeling off the socks he’d forgotten to remove earlier. “Just lie back and enjoy it, honey.”

Shouto took him at his word and, with that explicit permission, lay back and closed his eyes to better savor the feeling of Katsuki swallowing around him. The thinning fog that still lingered drew around him like a blanket, the pleasure mixing with and thickening it until it was warm as fluffy wool around him.

Shouto wasn’t sure how long he lay there squirming under that glorious mouth. It felt like both forever and only a few minutes. He had no idea how Katsuki kept him from finishing like Izuku had told him, because Shouto had made absolutely no effort on his part to hold anything back, lost in that dense haze of pleasure. 

At some point, he had let go of Katsuki’s hair to instead clutch at the bedsheets with one hand and his own hair with the other. When the hypnotizing suction eventually stopped, the wordless denial Shouto made was strung out and pathetic. He was only slightly mollified by Katsuki moving to kiss and nip at his inner thigh instead. 

Shouto could hear Izuku saying something about choice and asking and 'next time', but he was too flustered to understand. It seemed like he was talking to Katsuki anyway, so Shouto stopped paying it any mind. No matter what kind of complaining noise he made, though, Katsuki didn’t move his mouth back where he wanted it most.

Shouto could still hear Izuku talking, so he turned his attention over to him, thinking maybe he could intercede on Shouto’s behalf. This half-lucid train of thought came out as a begging whine and a grasping hand tossed out in Izuku’s direction.

The easy smile Shouto got in return was sweet, but the kiss that followed was sweeter. Izuku’s fingers ran soothingly over his scalp, and his every movement was tender. Shouto whimpered at the soft touch and couldn’t remember why he should be embarrassed about that. 

As gently as he could while Shouto kept chasing him, Izuku broke the kiss and pulled him up over the pillows to be at least somewhat upright. The change in elevation brought a little clarity, enough that Shouto could understand Izuku when he murmured, low and sympathetic, “I know, sweet boy, I know. Kacchan’s so good to us, isn’t he? But I need your help with something, love. Can you do that for me? And then we’ll make you feel good again, Shouchan, promise.” 

Shouto blinked, trying to get a handle on the river of Want that was rushing through him. If Izuku needed him, Shouto would do his best. It took several deep, calming breaths to get back to something approaching normal, but he did it. Izuku watched over him the whole time, stroking his hair and quietly humming in a lulling, tuneless way. 

When his body finally settled down, Shouto sighed heavily and threw his arms around Izuku’s shoulders, using their steadiness to leverage himself further upright. He got about halfway there before he was pulled into the well of Izuku’s crossed legs to sit sideways in his lap. Shouto was… mostly vertical now, and Izuku’s chest and shoulder were broad and very comfortable, so he called it good enough and leaned against the warm muscle holding him up, trusting in the soft, paternal care he was being treated with. 

A calloused hand stroked his back, rucking up the mess of a shirt that still clung to his shoulders. “Hi, sweet boy. Feeling a little better?” 

Shouto didn’t have the wherewithal to speak yet, but he hummed an affirmative and nodded into the crook of Izuku’s neck. It felt so nice, being held like this. It made him feel... small, in the best way. Maybe- maybe Shouto could call him that now? It felt right.

“Good, that’s good, honey,” Izuku crooned, the hand not rubbing Shouto’s back reaching out to… something, but Shouto couldn’t see. “Now, do you remember what Kacchan asked for before our break?” Another nod. “Would you still like to help with that, or would you rather rest, and I’ll have Kacchan go back to doing what he was before soon?” 

Shouto thought through his options the best he could through the fog in his head. Being lazy and having Tsuki go back to making him feel good sounded wonderful, but more than that, he wanted to… “Help, Daddy. Want to help.” 

Izuku sucked in a sharp breath, and the hand on his back shifted to loop Shouto into a tight hug, so he figured he’d made a good choice. “Okay, Shouchan. Thank you, sweet boy, so Good to me,” Izuku praised, the tone almost lyrical and very, very sweet. 

The arm around his waist readjusted and took on more of Shouto’s weight. “Alright, honey, I’m gonna put you down now,” Izuku warned him kindly. “Kacchan’s going to come over and kiss you, and your job is to keep his hands busy, okay? You can touch each other all you want above the belt, but nothing else until I have him prepped. Can you do that for me, sweet boy?” 

While he was talking, Izuku had worked Shouto's arms free of the annoying shirt and moved him back to his spot on the pillows, so he was able to lock eyes with his Daddy to show that he was paying attention. “No below-the-belt touching, hands busy, kissing,” Shouto recited obediently, nodding. “I can do that.” 

Izuku’s smile was proud and affectionate, and filled Shouto like a good meal. “I know you can, my sweet boy,” he said, scrubbing a palm over Shouto’s cheek. “Oh, and you can use your quirk if you want, as long as you keep to Katsuki’s normal rules, not play-fight rules, alright? If he says stop, you stop.”

“Mhm,” Shouto agreed, nodding. He knew it made Izuku nervous when they did their whole ‘complain, but not really’ thing around him, so that was fair. They knew where the lines were, but Izuku had a harder time with that, and his comfort was important, too.

He gave Shouto a grateful kiss on the cheek and then got out of the way for Katsuki to clamor over him on all fours. 

Oh, that was very nice, not letting him be by himself for too long. Shouto smiled. “Tsuki,” he greeted him happily. 

“Shou,” Katsuki said back with his own smile before ducking down to rub their cheeks together. That was one of Shouto’s favorite things, and he made a contented chirp to thank him for it. Katsuki wiggled just a bit above him and then kissed Shouto like he’d been promised. 

Remembering his task, Shouto ran his hands over Katsuki’s broad shoulders, savoring the feel of strong muscle under his fingers as he brushed them down his arms. Shouto had the vague idea of holding Katsuki’s wrists, but instead, the boy on top of him lifted his hands one at a time and wove their fingers together before putting his weight back on their facing palms. 

Well, that worked too for keeping track of Katsuki’s hands, and being pinned down and kissed like that felt very nice. It was more than a little romantic, too, which made him grin. Katsuki pulled away for a second to look at him. “What’s so funny?” he asked, more curious than offended. 

Shouto just fluttered his fingers where they curled over Katsuki’s knuckles. “Very ‘damsel’,” he explained smugly.

Shouto had definitely caught on to how much Katsuki liked being compared to the heroes in old movies and television shows, and he loved teasing him about it. It was one of the better motivations for Shouto to sit through ‘culture catchups’ that his classmates provided him in what free time he had to spare. 

Sure enough, a charming blush spread over the bridge of Katsuki’s nose and his cheeks before he leaned back in to kiss him, grumbling in a way that was not at all convincing. That went on for a few more moments before Katsuki’s breath caught, and then he pressed fervently back into the kiss. 

Not long into this new pace, Katsuki’s hands started to squeeze restlessly. Shouto could feel the start of dampness on his palms, so with his right hand, he sent a pulse of cold to stop the sweating, and let go with his left so that Katsuki could spark off. He made a startled noise at the temperature shock, but he took Shouto’s cue and moved his hand so he could set off his quirk safely away from Shouto.

Katsuki gave an appreciative hum at the gesture. He brought his hand back, this time cupping the back of Shouto’s head in a way that felt reverent. Shouto replied with a pleased moan, especially when the change in angle had Katsuki licking into his mouth deeply and lasciviously.

Now that it was free from their mutual clasp, that soft hand roamed from spanning the nape of Shouto’s neck around to caress his jaw as it worked to match the kiss, then down, lingering on his throat as Shouto swallowed beneath it. The texture of Katsuki’s fingers and palm was a heavenly softness that lit up Shouto’s nerves in all the best ways.

The feeling traveled along his shoulder, lightened to a single point as it traced his collarbone, and then spread against his sternum with a light press that Shouto encouraged by pressing over it with his own hand. Katsuki gave him what he asked for, applying a grounding pressure to the center of his chest, only stopping when Shouto no longer had enough breath left to kiss him back.

Then Katsuki slid his hand to the side, palming Shouto’s pec until the nipple beneath was hard, and toying with the sensitised nub until Shouto was pouring obscene noises into their open mouths. He hissed at a slightly too-hard pinch, the sharp sensation now more pain than pleasure, and Katsuki gave him a gentle rub with the flat of his thumb to soothe it. Letting the overwrought nerves rest, he stroked down over Shouto’s ribs in slow circles, sometimes closer to his center and sometimes over his side.

It took almost all of Shouto's self-control to stop the blissful touches when they dipped past his navel, but Izuku had asked for only one thing in exchange for all this. Shouto wouldn’t neglect it when he was already being given such an embarrassment of riches. Still, he wouldn’t give up Katsuki's sinfully soft hand on him entirely. Instead, Shouto pulled him back up by the wrist, not having any particular destination in mind.

At the same time, Katsuki was distracted by something going on behind them. He moaned messily into the kiss, the competent grace of his usual movements falling apart under the mysterious stimulus. Katsuki’s body began to rock in a steady rhythm, and Shouto’s hazy mind finally put together that it must be whatever Izuku was up to.

What had he said? Something about… prep… Ohhh. Shouto remembered now. Well, now he knew why Izuku set that rule.

As their kissing got sloppier and more uncoordinated, Shouto’s limited lucidity was devoted to clutching at the hand still holding him down while pulling on the other in the opposite direction of where Izuku said not to touch. Before he knew it, that wonderful touch was back up to his neck, and still going. It felt divine, the way his chin had to tilt up to make way for Katsuki’s palm.

Just then, the boy kissing him let out a sharp cry. Exhausted, he broke the kiss to press his forehead to Shouto’s shoulder. In a combination of dazed want and what he could only call divine inspiration, Shouto grabbed the hand under his jaw and brought it to his mouth to replace the kissing he’d been spoiled with. 

He was a bit imprecise with the positioning, though, and the vague idea Shouto had of sucking on two became having his mouth filled almost to capacity with Katsuki's first three fingers. The burnt-sugar smell of his palm filled his nose, making him dizzy with the sudden influx of sensory input along with the blissful stuffed feeling in his mouth. A muffled groan escaped him, overcome as he was. 

He was genuinely unsure if the feeling or the noise garnered more attention, but either way, Katsuki’s head snapped up from his half-collapsed sprawl. Red eyes locked with his, and after a moment, the pads of his fingers curled to pet Shouto’s tongue. The soft skin felt just as good (if not better) here as the rest of his body, and Shouto made no secret of his enjoyment. 

Clipped curses fell from Katsuki's mouth in the particular way he sometimes did when he saw something that he really liked. Shouto took that as a compliment and decided to do his best to suck on the fingers in his mouth. It was a bit clumsier with three, but he thought he managed fairly well. Katsuki certainly seemed to like it, from the way his hand started rocking into Shouto's mouth in time with his hips, and loud moans followed the motion. 

Oh, there was Izuku! Shouto had missed him. He was leaning over Katsuki’s shoulder (well, more like his back), forcing Katsuki's spine into a steep bend. Curious green eyes peered down on him from that sweetly freckled face.

Shouto tried to say something to greet him, but he forgot Katsuki’s hand was in the way, so it came out hopelessly garbled. Oh, well. Shouto was sure Izuku knew what he meant. 

Confirming that, their Daddy said back smilingly, “Hi, honey. Are you being a Good boy for us?” 

Shouto nodded back. He’d followed all the Rules. 

Izuku's grin broadened. “Thank you, sweet boy. Did you have fun?” 

Shouto nodded again. This had been very nice, so much so that the inside of his head felt... fluffy.

“I’m glad,” Daddy said, voice sticky as syrup. “I’ve got a question for you, Shouchan, and it would be easier with words. Can you do that for me, please?” 

Reluctantly, Shouto released the fingers he had been sucking on. He was pretty sure he could talk once his mouth was free, and Izuku's tone promised something good if he went along with the request.

His mouth dropped open, and Katsuki took his hand back, swiping at Shouto’s cheek to wipe off the spit (which, rude). But once it was passably dry, Katsuki used it to smooth back his hair and started kissing the extra nice spot just under his ear, so Shouto magnanimously forgave him. 

“Thank you, darling. Now, I want to give my baby boy everything he asked for, because I love spoiling him,” Izuku explained with a subtly seductive tone, which paired well with the way he was running his hand over the length of Katsuki's spine, causing him to make all sorts of interesting noises. “But I like spoiling you too, sweet boy, and you’ve been very Good for me. We’ve got two options for how to do this, and I want you to pick which one you want as your reward. Does that sound good to you?” 

Shouto perked up. He had earned a reward? A little bubble of pride rose in his chest at the thought. “Mhm,” he agreed, nodding eagerly. The concept of being offered rewards for obedience was still fairly novel to him, but so far, it was delightful, and Izuku's rewards were always fun. 

“Excellent,” the man in question purred, his smile turning roguish. “The first option is for us to stay pretty much like this. You relax, I scoot Katsuki back a little, and he swallows you down again while I fuck him.” 

Shouto’s eyes widened at the obscene picture those words painted, but he held his peace. He’d learned quickly that Izuku’s Options were always worth hearing out, especially when they were about sex. 

“The second option is for me to flip Kacchan over and you fuck his pretty mouth while I take his ass. It means you would have to stand up, but this way I can kiss you, and you can see everything.” 

Oh. Wow. Okay. Shouto had to think about this. They were both very tempting, but which one did he want more?

Part of him very much did not want to leave his comfy spot, but… he really wanted to see Katsuki all fucked out between them. He was such a pretty boy, and the idea of being able to see, touch, and even kiss Izuku while it happened felt like gluttony itself. 

The thing that sold it, though, was that Shouto put together what it would mean for Katsuki to be belly-up while Shouto had his cock in his mouth. He’d have to hang over the bed, kind of like Shouto had that first night, mouth open and throat exposed. Would he be able to see-? 

The thought alone threatened to make him overheat, which would be a bad idea with Katsuki still lying on top of him. Quickly, Shouto put the thought away, but he knew which Option he wanted.

“I’ll get up, Daddy. I wanna see.” (It was both surprising and not that the epithet came so easily now. It just felt… right, especially with how tenderly Shouto was being treated.) 

Izuku gasped at the name, just a little, but the look of joy in his eyes was a memory that Shouto would treasure. He leaned forward, squishing Katsuki a bit, so he could give Shouto a quick, delighted kiss. “My sweet boy is so good to me.” 

Backing away to look at the blond squished between them, he asked, “Baby boy, are you okay with mess tonight, or do you want me to grab the condoms?” 

“Want Daddy to come inside, dummy,” was the unmistakably bratty answer. If Shouto had gotten to process that declaration in its entirety, his reaction would probably have been much different (and by that, he meant meant with near catastrophic amounts of lust), but he was distracted by the petty name-calling. 

Feeling offended on their Daddy’s behalf, Shouto poked Katsuki with his right hand, letting out a little burst of cold as he did. “Don’t call him dumb, Tsuki. He was just asking,” Shouto scolded, hearing only a second too late the equally bratty tone in his own voice. 

Katsuki flopped on top of him, exasperated but luckily not actually angry at his arrogant chiding. “Yeah, yeah, whatever. You and your stupid ice fingers,” he groaned. Which was fair enough, Shouto thought. 

Sounding amused and fond, Izuku hummed and said, “Thank you for defending my honor, sweet boy,” brushing Shouto’s hair back with his fingers before levering himself a bit more upright. “Come on, Kacchan, let’s get you laid out all pretty.”

He gathered Katsuki up in his arms, who moved with all the ease of a cooked noodle. Izuku had to use both arms just to keep him from flopping back over onto Shouto. The only part of Katsuki that wasn’t impersonating a piece of wet paper was the hand holding Shouto’s, keeping a deathgrip on that last point of connection. 

Izuku just laughed at Katsuki's antics. “Yes, yes, I know. Your favorite playdate isn’t going anywhere, baby. Shou can hold your hand the whole time, promise,” he cooed, with the same cadence someone might use on a cranky toddler refusing to go to bed. True to his word, Izuku waited for Shouto to follow the stubborn tether rather than pulling him away. 

Shouto trailed after them, feeling all kinds of warmth at the obvious display of affection. Katsuki was plenty demonstrative in his own way, but this clinginess was not something he normally got to see. Usually, between them, it was Shouto who was chasing physical contact in any way he could think of. Being the object of such blatant greed was delightfully satisfying, especially in the wake of being kissed so very thoroughly. 

More than that, though, it was the oh so tangible reassurance that Katsuki actively wanted him close, wanted him Here for what was coming next. Shouto had a feeling it was going to be even better than he could even imagine, and he was more than happy to follow Katsuki's pull and Izuku's voice wherever they might lead him.