Archive of Our Own ^beta

Chapter Text

 He could barely remember how it all happened. He knew he was supposed to be hitting a rut sometime soon, but he hadn’t expected it to hit so abruptly. It must’ve been something about being around the Straw-hat pirates, specifically Monkey D. Luffy, since they always seemed to set him off in different ways. 

The morning had started off semi-normal, though an irregular headache had been irritating him from the second he’d woken up. After rendezvousing with the Straw-hats at a small, bustling island, mostly to quell the incessant bothering from their captain, both him and Luffy were sent off to do some supplies shopping. 

His senses had almost seemed heightened, making his sensory issues worse than normal. Everything felt sticky, even the slightest noises put him on edge, and he almost felt feverish. He had scanned himself, not finding anything to be wrong, but even using his power had felt like overexertion. 

It should’ve been obvious, really, but it wasn’t until his instincts had finally tipped over the edge and took hold of him that he had realized too late. 

~

Luffy had been blabbering on as usual, filling the silence of the forest they’d had to trek through by talking about unimportant things as the two walked. He’d been in the middle of talking about some fight that he and his crew had just won before all of the sudden halting in his tracks as he stopped to sniff the air. He made a displeased face, clearly not enjoying whatever he’d smelled. 

Luffy stopping so abruptly had nearly made Law run directly into him, giving him that excuse to finally push over the edge and give into the irritation that had been building all morning. 

“Straw hat-ya, if you don’t keep walking, I’m going to drag you by your fucking shirt.” He spits out, eyes narrowed and pupils shrinking down to the size of a pinhead. It wasn’t intentional, but he couldn’t stop the venom that snuck into his tone. 

“Torao, you smell super pissed off, what’s your problem?” Luffy asks, nose scrunched as he took  in the scent of an almost-burning wood scent filling the air. The venom went straight over his head, per usual, and he focused on whatever had grabbed his attention. 

Leave it to Luffy to unknowingly poke and prod at the angry bear.

Against his own better judgment, Law bared his teeth, grabbing Luffy by the collar of his vest and pulled him up to be face-to-face with him. The mere height difference between the two had Luffy’s feet dangling in the air. The feeling of no longer having solid ground beneath his feet made him wrap his own hands around Law’s wrist.

“What the hell, Torao?! Let go.” Luffy grumbles, nose scrunched in slight irritation at such a handsy approach. Normally, he liked Law’s attention, no matter what kind it was, but the fact that Law was so pissy made him feel a bit conflicted. 

“I thought I told you to keep walking.” Law spits back, his body involuntarily pushing his scent in an attempt to show dominance. He just wanted to get the younger to continue on with the supply trip so he could get back to the Tang and figure out what the hell was going on with him.

While the clearly pissed off part of his brain wanted to speed through the trip and get himself answers, he couldn’t deny that there was another part of him that was fixated on the feeling of the other struggling under his grasp, kicking his feet to attempt to loosen his grip. It had Law feeling a rush of something hot wash through him.

Something far too close to arousal for his liking. 

“Just drop me already!” Luffy protests again, finally getting enough leverage to swing a foot up and push up and out of the older’s grip. He brushes himself off and tugs his shirt back into the right spot.

Law simply huffs in annoyance and retracts his hand as Luffy brushes himself off and tugs his shirt back into the right spot.

“Man, you’re so touchy today..” Luffy grumbles under his breath before giving Law a look he’d given about a million times already. His stupid little pout that always got to Law, no matter how dumb he tried convincing himself it looked.

It always hit him in a cute way before, but right now was nothing compared to how he looked in the past. The younger puffed his bottom lip out into a bit of a pout and looked up to Law through his lashes.

The look sent blood rushing straight down to his dick and nearly made his eyes burn as an all too familiar heat had filled his veins. He’d realized far, far too late what was going on, and he felt like an absolute idiot. 

It took him a morning full of subtle irritations, feverish symptoms, and getting himself isolated with someone, another alpha at that, to finally understand what his body had been trying to warn him of. 

His rut. 

It wasn’t supposed to hit for at least a few more weeks, but apparently it had come early. Sure, he wasn’t blind– he’d known had some kind of attraction to Luffy for a while now, especially after coming to terms with those feelings in Wano, but he’d always pushed them down since the two’s secondary genders just weren’t compatible.

They weren’t compatible was a mantra that Law kept repeating to himself in his head since his brain continuously tried to convince him otherwise.

The tension that Law was creating as he looked down to the younger had grown at almost too quick of a rate. Once he’d realized that it was his rut making him so aggressive, he was finally understanding why his brain had been sending urge after urge through his body.

Luffy had begun walking again, happy to continue prattling on about odds and ends before the older had realized, and he had to quicken his pace in order to catch up. He tries to be logical and think of a way to get the two of them separated before he succumbs to his own rut and eventually pushes Luffy into one of his own. More importantly, a way to get him some suppressants to be able to lock himself in his private quarters aboard the Tang.

Each step became harder than the first, and his will to resist was dissolving much too fast as his eyes trained on Luffy’s leading form. It was difficult to miss the way that the two dimples on the small of his back wink at him when his jacket gets pushed up and out of the way by the wind. God , he just wants to dip his thumbs into each one as he pulls Luffy’s hips flush against his own.

The full image of Luffy panting and mumbling incoherently as Law fucked into him deeply had him quickly attempting to grasp onto the last strands of his sanity. He couldn’t keep going, he had to stop.

“Luffy,” He starts, gripping Kikoku tightly in his hand as he spoke, “I need you to head back to the ship and grab Chopper for me.” 

“What? Why? Are you hurt or something?” Luffy follows up immediately, those big doe eyes of his wide and curious, as he slows to a stop a little further ahead.

The way Luffy tilted his head in curiosity made his hair frame his features in a way that made him look soft. That paired with the height difference between them had been driving Law insane.

He couldn’t tell if Luffy was just naturally this fuckable or if his instincts were confusing him.

“Does it matter?” Law asks, brows furrowing as another wave of heat pulsed south. 

“Of course it matters!” Luffy fires back, his own brows furrowing a sign of his own frustration. “First you act pissy all morning, then you grab me all weird, and you look like you’re about to shit yourself-” Luffy starts again, before Law sharply cuts him off. 

“I don’t have time for this.” He grits out, the burning need to fuck something beginning to take over his better judgement. 

“I don’t care, I just want to know if you’re okay-” Luffy begins to bicker back, and before Law’s able to stop himself, he’s already reached out for the younger. He’d not only grabbed Luffy’s shirt again, but had flipped and pushed him up against the nearest tree with teeth bared before he got his next words out.

“I’m in a rut , and unless you want me to fuck you against this tree like an omega, I’d suggest getting Chopper.” He snarls, about to push off and turn away only to be stopped in his tracks when a specific, citrus-like scent hits his nose.

He’d never picked that scent up on the Sunny before, or the Tang, for that matter. 

Was that what Luffy had smelled like when he was aroused?

That thought alone had Law succumbing to the feral, desperate instincts clawing their way over control of his brain. He’d have time for regret later. Right now, every single nerve ending on his body was directed on the slight shiver he felt run through Luffy’s spine.

A single breath was shared between them before Law pulled Luffy’s back against his chest even closer, hand wrapped around his throat as he whispered into his ear.

“Would you like that, Luffy-ya? Do you want to feel me here?” Law asked, a smirk stretching across his lips while his hand dips low. The tattooed digits brushed across where, if he were an omega, his womb would be. Despite the growl he could hear rumbling beneath Luffy’s chest, he could feel the way that the younger’s body tensed in curiosity.  

It made every dominating instinct within himself purr at the power he’d managed to trap against his body. 

A sharp scent hit the air. That citrus base was still there, but it turned more into something heady as it wrapped itself around Law’s senses. 

While his first gut-punch reaction was to snarl at the scent, taking it as an attempt to dominate his authority, it also piqued his interest. It was a little more musky than what Luffy’s normal scent was, a little thicker-

Rut, he realized almost immediately. 

He was smelling another alpha’s rut starting. Luffy’s rut specifically, if the now bared teeth the shorter flashed up at him had anything to say about it.

“Let go.” The words that left Luffy’s mouth were tight. Was that an order ?

“I don’t take orders from the likes of you, you should know better.” Law near snarls back, his grip changing from one of exploration to one of captivity. He wanted to keep the younger underneath him, bent over if his instincts had their way, and begging for him. 

In all honesty, Law should’ve known better. He knew better than anyone that one cannot simply contain the force of nature known as Monkey D. Luffy. It was like attempting to claim ownership over the idea of freedom itself.

“Well I don’t take yours either, Torao.” The near feral sound of Luffy’s alpha timbre made Law almost freeze in place, his muscles not responding to the signals that he was desperately sending to them. His brain was trying to get himself to do something, to take control, but he only felt Luffy’s pulse and his own humiliation rushing through him. 

That split second of hesitation was all Luffy was willing to take before he moved. He whirled, flipping them quickly and taking the hands that had been pressed against him so possessively and held them up taunt on either side of the taller’s body. The skin on his wrists dug into the tree behind him, his spine taking the brunt of the slam against the bark. 

Law’s eyes squeezed shut, head spinning as a mixture of emotions bubbling up in his chest, but the raw embarrassment was the heaviest. Before he was even able to get a word in rebuttal, he was cut off by Luffy tightening his grip and growling out in frustration.

Luffy had never felt more conflicted in his life. He knew he had selfishly wanted Law, had for a long time, but he knew that Law was outwardly fighting his grip. The scent that Law had been giving off, his usual woodsy musk, shifted to one that was almost sweet . He’d never smelled something so heavenly before in his life, and now he wanted to devour it. 

That sweet scent… Law must want this too. was the conclusion that Luffy had come to.

He wanted Law, and there was nothing that was going to stand in his way. Not people, not pesky things like secondary genders, and not even Law himself. 

“You smell good, Torao.” He comments, invading far too much of an alpha in rut’s personal space far too quickly. 

The reminder that he was being dominated by a younger alpha had made a flash of outrage run through him and he fought against the tight restraints of Luffy’s hands in an attempt to buck him off. 

The attempt was thwarted with an even tighter, bordering painful, grip on his wrists and Luffy ignoring his actions. The younger only responded by nosing his way towards the scent gland that furiously attempted to push enough scent out to overwhelm his own.

The final straw in Law’s mind snapped when Luffy went as far as to flick his tongue possessively over the gland as if he were trying to lap up the near palpable scent he was pushing. 

“Fuck. Off. ” Law snarled, body thrashing as it rejected the attempt to be dominated, to be pushed around by an alpha so easily– to be dominated like an omega.  

The constant back and forth of dominance between them had forced Luffy’s instincts to take the reins. He was getting too frustrated to keep a handle on himself, and one final push back from Law was accompanied by a small wave of Conqueror’s Haki that Luffy unintentionally let slip. The command didn’t need to be said out loud, the intent ringing out loud and clear in Luffy’s deep brown, almost black eyes as they simmered up at Law– almost daring him to try again, to fight back.

While Law didn’t have his own Conqueror’s Haki to push back, he did have enough strength to resist passing out. Though, that didn’t stop the blood from pushing far too fast to his cock in response to the most humiliation-filled arousal that flooded his system.

The reaction was almost immediate, the forceful bowing of Law’s head and the sudden calm that washed over his limbs, effectively killing any resistance.

Trafalgar D. Water Law was not a man known for submitting, or taking orders. He’d made it a bit of a point to not do that, to forge his own plans and commit enough to seeing them through. Yet, despite how humiliated he felt, the feeling of Luffy forcing him to stand down with a single look had an embarrassing amount of pre-cum spurting from his tip and an even more embarrassing groan slipping from his lips. 

Luffy had forced him to stand down, and Law had liked it. 

“Torao..” Luffy groaned out, forcing his attention back on the shorter man in front of him, “m’ all hot and sweaty now, and you smell so good..” He finishes, experimentally rocking his hips into Laws and relishing in the friction it provided. 

Law found all of his strength sapped from the rut flooding his senses and the lingering effects of the haki and simply let his head thump back against the trunk of the tree. Each roll of Luffy’s hips had wave after wave of pleasure crashing into him. He was already ridiculously hard, straining far too uncomfortably beneath the fabric of his jeans. Luffy was too, if the imprint pressing against his own had said anything about how high-strung he was feeling. 

“Hey.. you’ll let me fuck you, right?” Luffy rasps out, tongue flicking out once more over Law’s gland, selfishly enjoying the way the older’s arousal scented the air a little more at his words. 

He’d never admit it, far too proud to ever humiliate himself like it in this headspace, but part of him wanted to let Luffy fuck him. He wanted to feel the way the younger would stretch him out. 

He was simply curious, that’s all this was. 

“Just be fast.” Law manages out tightly, unable to stop the next buck of his own hips into Luffy. 

Just curious. 

“Seriously?” Luffy affirms, eyes flicking up to Law’s once more, as if he hadn’t used haki in order to make the other man submit to him mere moments ago. 

“I won’t say it again.” Law warns, flashing his teeth in a half-assed attempt of a threat. 

The consent was all Luffy needed before his hands were flipping Law around and pulling his hips back, almost putting his ass out on display. He realized all too quickly when Luffy had quickly proceeded to unbutton and rip his pants down that Luffy had forgotten the fact that Law was an alpha, and not an omega who could produce his own slick. 

“Wait- fucking wait , you asshole-” Law starts, whipping around to grabbing Luffy’s wrist as he had just finished releasing his own cock from its tight confines, “I’m not some omega in heat. I don’t have any slick and I’m not stretched.” He finishes tightly. 

Luffy’s brows furrow in contemplation, clearly forcing his instincts back to take a minute and think about Law’s comfort. 

“If you want to fuck me, you have to stretch me open-” Law starts before being rudely interrupted by Luffy sticking two fingers in his mouth. Law nearly splutters around the digits before realizing what the other was up to. He would’ve bitten down on them in any other circumstance, but after deciding he’d rather not tear himself open just because he was horny and curious, he swirled his tongue around them instead. 

Either due to his inexperience, or impatience, Luffy pulled them out and immediately prodded them against Law’s rim. Unused to the feeling, Law tensed, hips pulling forward in order to escape from the intrusion. 

The younger huffs and drops down to his knees before the older can ask what he’s up to and pulls his hips back, allowing Luffy mouth to connect harshly with the tense, tight ring of muscle he’d been trying to stretch open. A rush of something primal forces a shiver up his spine, the feeling much different than a finger prodding at his hole.

His body and his brain are clearly at an impasse; one part of him wants to indulge his curiosity, and the other wants to make it clear who’s allowing him to do what he’d like to. 

Though, he doesn’t get to put much thought into it before Luffy breaches his rim and pushes his tongue into Law’s tight walls. 

If he had thought the first groan he let out was embarrassing, it was nothing compared to the whine that had slipped through his lips this time– almost sounding a little too needy and desperate. 

Luffy moans something out below him, but he can’t make it out with how lost in himself he is the sensation. The way the reverberations of his voice send shivers up his spine, or the way he’s loudly slurping at his hole. Usually, he’d think something like this is unsanitary, but with how loud the younger one is beneath him, he could only feel that familiar heat getting hotter and hotter in his stomach. 

The process of stretching, at least in this way, was unfamiliar to Law, yet despite the uncomfort that came along with it, he couldn’t help but become absolutely weak in the knees with the way Luffy devours him. The way that he eagerly laps at his rim and then plunges deep like he’s the last meal he’d ever taste. The thought of being so desirable and wanted was making him feel light-headed, so much so that he let his entire weight collapse against the tree he’d been pushed against.

It came to a point where Law had actually craved something more, something thicker, something deeper , and after swallowing the humiliation, he’d managed to rasp out to Luffy. 

Displeased with the lack of a change, Law decided to speak up once more.

“I need more than your tongue, Luffy- ah ” is what Law manages to get out before he feels Luffy press his tongue directly against his prostate and his vision goes completely white with pleasure. 

Oh fuck.  

He needed more of that, and he needed it to be with more than Luffy’s fucking tongue. 

“I already told you, I need more than your tongue.” Law tries again, mustering the last of his strength to turn his head over his shoulder to look down at Luffy. 

Luffy had completely ignored him, twice now. In fact, he’d only gotten louder at the retort, pushing his tongue deeper as he realized he had found a spot that made Law shudder like the way he had. 

Thrust after thrust had made it clear that Luffy had no signs of stopping. He hadn’t stopped upon Law’s half-assessed attempts at a protest, and hadn’t stopped when Law had cum untouched, and spurted ropes of thick cum up while Luffy fucked him through it.

The orgasm had hit Law hard, making it struggle to stay upright as his knees threatened to give out at any moment. The fog of rut was barely sated by that feeling, especially since he hadn’t even been touched. He’d need more if he was to actually be sated by this. 

Too lost to process Luffy’s movements, he barely realized that the younger had pushed his fingers past Law’s lips in order to wet them again before he pushed them right back up against his thoroughly devoured hole. This time, the glide is much easier, and feels so much better. A low groan sounds from deep within Law’s chest as Luffy’s fingers push in down to the hilt and begin their work on opening him up.

It didn’t take long for Luffy to deem the stretch wide enough, which pushed Law pathetically over the edge again, before eagerly slotting himself up against the taller man. 

“You’re gonna feel so good, I already know it, Torao..” Luffy mutters, his words finally being clear for the first time in what felt like ages. 

Law only offers a weak-sounding huff of impatience in response. One that’s responded to with actions instead of words. Luffy aligns his throbbing cock against Law’s puffy hole and pushes in slowly, almost as if he were trying to savor the fruits of his efforts in taming an alpha. 

“You’re so tight n’ wet… ‘s too good.” Luffy moans out wantonly, pushing in a little faster, eager to get every inch of his length wrapped up in the velvety warmth that Law provided. 

“Stop crooning to me like I’m your omega, Luffy-ya.” Law breathes out, unsuccessful as he tries not to sound every bit as wrecked as he is. Especially with the surprisingly satisfied noise he makes when he feels Luffy’s hips slot plush against his ass. 

“You might as well be with how tight you’re squeezing me.” Luffy growls low into his ear, giving the slightest roll of his hips, just to test how good Law’s walls would feel clenching down around him.

What should’ve been a horribly humiliating feeling, namely another alpha’s cock buried deep within him, had been terrifyingly exciting. He’d never felt such a sense of satisfaction as when Luffy began to experimentally pull his hips back and thrusted back into him. The drag of his cock had felt a little too good against his walls with every resounding smack of skin against skin. 

He lost himself to his delirium as Luffy muttered out filthy praises into his ear, each one getting more delusional as the last. So tight, so warm, you feel so fucking hot.. Luffy groaned into his ear, clearly obsessing over the way Law was wrapping around his length. 

He was barely making the words out as Luffy pounded into him, pulling out and pressing deep within him as if he was trying to get Law’s body to remember the imprint of his cock and the way it stretched him open. 

Law had already felt himself getting close, pushing his third orgasm as Luffy fucked him closer and closer to that line. Fortunately for him, Luffy’s attention had been better than he thought, and he’d kept his pace as he realized how close Law was getting. 

“Fuck…” Luffy groans out, grinding his hips deep as he bottoms out once more, “you feel so perfect for me.. Gonna fill you up full of me..” The younger babbles on, and it had Law’s brain screeching to a halt while his body had clenched down even tighter around the other. 

Desperate hands had explored the vast expanse of Law’s still clothed chest, ripping a few of the buttons off in order to get access to skin. His fingers pinched and kneaded at his soft pecs, becoming particularly interested in the keen Law made when he flicked and toyed with his nipples. 

“What’re you talking about?” Law pushes out, breath coming out in quick pants. He couldn’t deny the idea of being full of Luffy’s warm seed didn’t sound absolutely incredible right now, but the logical part of his brain knew what was coming next. 

“You’re gonna be a good bitch and carry my pups, right?” 

Hearing it out of Luffy’s mouth had been way hotter than it had any right being. Especially with the way Luffy’s thrusts had gotten deeper and sharper, nearly fucking any coherent thought out of Law’s mind. Instead of answering, Law merely let his head hang low, pushing his hips back in time with Luffy’s as he teetered close to the edge. 

Opposite of what he thought would happen, Luffy’s hips slowed, and Law’s head picked up slightly. 

“Why the fuck did you stop-” Law whines, ignoring how pathetic he sounded. 

“Not gonna finish until you agree.” Luffy offers stubbornly, seemingly more content to lap at Law’s puffy scent gland than to fuck him full like he promised. 

“Agree with what ?” Law asks impatiently. 

“That you’re gonna be my bitch who’s gonna carry my pups.” Luffy continues, a deep grind reigniting the urge to finish. 

“I’m not gonna say it, just finish already.” Law huffs, prompting Luffy to continue with a roll of his own hips. It was frustrating enough to have to beg another Alpha to fuck him, but even more so that he considered doing it.

Luffy’s hips pulled back and thrust sharply into Law as he growled a command low into his ear, “Say it.”

Not trusting his words anymore, Law simply whimpered at the feeling. It was bordering overstimulation with the fact that Luffy was practically edging him. 

“I want to hear you say it, Torao.” Luffy presses again, the timbre in his voice giving clear expectations– submit and obey. A stark reminder that that’s what Law had been doing the entire time they’d been out here. 

His thrusts pick up in speed, just like his insistence. Luffy wasn’t going to accept not getting his way, and it appeared Law was weak to giving way to the younger’s desires.

After a couple more thrusts, Law finally cried out, unable to hold back anymore as he was desperate to feel Luffy cum deep inside of him.

“ Fuck – I’ll, I’ll be a good bitch, just fucking fill me already.” He whines out before barreling over the edge with Luffy’s next sloppy thrust as he feels the knot beginning to catch on his rim.

“That’s it…” Luffy grins, a feral and victorious expression spreading across his features as if he knew exactly what he just did. A final thrust inside was all it took for Luffy to bottom out, groaning as his knot finally spread Law just that final stretch before he shot his seed deep within the other. 

The warmth spurting into him felt like something he’d desperately needed and was finally getting– like a drink of water after being stranded in the desert. It felt good, giving in like that– submitting . So good, in fact, that Law knew it’d be something he’d crave over and over again. 

Just sating some curiosity. That’s all. He reminded himself even through his fuzzy euphoria.

His blissful high didn’t last for much longer, and the sound of Luffy catching his breath brought Law back to the present. Luckily, his rut had faded enough to where he had a better grasp on himself, and with the way Luffy’s skin didn’t feel as fiery hot anymore, he had hoped that he’d felt the same. 

Unfortunately, now that he’d had some wits about him, he realized what position he’d put himself in, and what he’d allowed. Granted, he’d wanted it all, every single thing that Luffy had given him, but he didn’t know what to do with himself now that he’d gotten it. 

How was he supposed to ever have sex again unless it was just as mind-blowing as being dominated against a tree in the middle of god-knows-where by Monkey D. Luffy.

The feeling of Luffy nuzzling into his neck made him slightly turn his head towards the other and huff and feign annoyance. Though, in all actuality, the position with Luffy was comfortable. Luffy had made it work, despite their height differences, and made him feel a bit too many things that Law hadn’t felt in a long, long time. 

This was a dangerous position to be in. He couldn’t spare any affections on another alpha, let alone one that was a captain on a completely different ship. Nothing about it was logical, but he couldn’t deny a small part of his brain warming up to the idea of something that he knew he couldn’t have. 

“Torao.” Luffy calls out, voice a rare soft, low tone.

“Hm?” Law hums out, not feeling the energy to give a longer response.

“You’re purring.” Luffy responds with a pleased chuff.

It had taken a moment to realize, lost in his own thoughts, but he could feel the rumble in his chest. He’d purred maybe once, twice at most, in his life, and this was a new one to add to the list. 

The feeling stunned Law into silence for a moment, so Luffy spoke back up.

“You must’ve liked that then, hm?” He asks, shifting his hips only slightly as he felt the swelling of his knot finally start to reduce. 

There was no one else around, and Law couldn’t bring himself to lie. 

“I did.” It was a simple answer, but it was an honest one.

The longer they talked, the more uncomfortable Law had become in his position. He could feel a mixture of fluids drying and quickly becoming irritating. At least he’d had the foresight to take his pants completely off before they were ruined, his shirt on the other hand… that had been too soiled to continue wearing. 

“We need to get back to the ships before our bodies force us for round two.” Law sighs out, wincing as he feels Luffy’s knot finally pull away from him, detaching them both.

Despite Luffy’s grumbling, he helps Law get back into his clothes and wipe down his shirt as best he could with a  nearby stream. Once properly dressed, they’d decided to just use the remaining of Law’s power to quickly get back to the ship. 

Luckily for the both of them, there wasn’t much explaining that needed to be done, as most of the other alphas and omegas across both ships had smelled the issue before it was even brought up. 

While the Heart Pirates were all ready to let their Captain do his usual routine, they were a bit shocked when Law tightly requested that they anchor down for the next couple of days while he stayed aboard the Sunny. 

Both Luffy and him had gotten looks, certainly, but nothing that they weren’t too worked up to forget about. Especially with the way that Law flashed sultry eyes that enticed Luffy to bed him again and again, filling him up just as full as the first time that Law had let him inside. 

~

Ever since both of their ruts had ended and they parted ways, things had started off normal. They had only spent the first few, intense days together and then departed shortly after that. Just as they had originally planned to from the beginning.

The rest of his rut went smoothly with the help of personalized suppressants, and he had begun to feel back to normal as the days passed. No more urges, and the burning beneath his skin had begun to fade.

Well, that is, until some of those same symptoms had begun to sneak back up on him again merely a symptom-free week later.

The first sign started with a couple of his crewmates beginning to sniff at him a little more often. At first, it was unnoticeable, as only his closest friends had picked up something, but by the end of the week, the entire crew was acting ridiculously about it. It was just weird when he first noticed, but then it grew annoying. 

The annoyance grew into irritation at the smallest things. He often found himself getting snippy much faster than he usually would at things that didn’t really matter in the end. Almost as if he were stuck in this mood swing pendulum as the days passed him by. 

The final straw had been when cramping in his stomach had begun. There were small aches and pains here or there, easy enough to pass off as a poor appetite or indigestion, but the longer it happened, the worse it got. 

Much like today, actually. 

Law had been stuck in his room, unable to move because of how severe the cramping was. He'd tried to rack his brain anything that would make sense to make him this ill, but nothing specific sprung to mind. If he’d had the energy to give himself a scan maybe he’d be able to see exactly what’s wrong, but he couldn’t. 

No one had bothered to say anything until Law had snapped and Shachi had finally broken the ice about it.

“What? Why are you all being so weird and sniffing at me?” He asked, brows furrowing as his three closest friends all shared looks between each other.

Shachi sighed and spoke up, “Well, Cap, it’s because you smell…. different? Not in a bad way, but just different.” The redhead gave a bit of a contemplative look over Law, to which he offered back a bit of a scowl.

“Different?”

“Yeah! It’s almost a bit sweet? It’s hard to place what it smells like…” He huffs, trailing off as he thought. Per usual, Penguin easily finished his train of thought without too much effort.

“Well, it almost reminds me of an omega. Your spiced scent is still there, but instead of being dark and mysterious, it’s lightened up a bit.” He finishes, taking a bite of the food that they were all sharing together in their mess hall.

It had taken Law a full moment of processing before he followed up Penguin’s statement with a question of his own.

“Say that again.” Law orders, eyes flashing over to Penguin, though not necessarily in challenge.

“Your scent is still there-” Penguin starts, before Law cuts him off with a deadpan stare. 

“Not that part. The very first thing.” Cogs were beginning to turn in his head, and he wasn’t sure he liked where it was turning. 

“It reminds me of an omega.” Penguin reiterates, his head tilting to the side as he did so. 

His response is almost accidently dropping his mug full of steaming espresso, spilling some of the deep brown liquid as his body jerked at the realization. 

Bepo had jumped up, quickly running for some kind of towel or rag in order to clean up the hot espresso as it dripped down the table. Shachi and Penguin had given their own yelps at the surprising clank of his mug against the table. 

“Captain?” Bepo asks, face pinched into a worried expression as he continues mopping up the minor spill. 

“He bitched me.” Law mutters aloud, setting his coffee down in order to put his head in his hands.

“Luffy bitched me.”

Chapter Text

After the initial realization that he’d been bitched, all of the changes in his mood and body had begun to make sense. His mood fluctuates had most likely been due to the hormones in his body changing, altering his body chemistry down to its very fiber. His scent changing had obviously been pheromones settling and attempting to attract potential suitors. 

Suitors that Law most certainly did not need.

All of the information had hit him all at once, and it felt a little overwhelming. It was difficult to believe that something like this was even possible. Sure, he’d heard tales of alphas being bitched, or even omegas being studded in order to make an easier partnership, one that was desperate to conceive– but those were tales, legends even. Law was sure that they were some fairytale wish that desperate alphas or omegas made up in hopes to allow them to take care of their partners. The fact that it actually happened, to him, was an impressive feat.

It was embarrassing for him to admit, but he didn’t know all that much about it. He knew the bare minimum basics, as it was a topic in one of the surgical studies he’d read at some point, wanting to understand even hypotheticals, but none of it was useful in the manner of what to expect after the phenomenon had actually taken place.

For once, in the field of medicine, he felt lost and embarrassed.

The silence that overtook their table had allowed Law to get stuck in his own head for a moment until his friends had gently pulled him out of it.

“Cap, what do you mean Luffy bitched you?” Penguin asks, his voice curious, but taking on a bit more of a careful edge to it.

Of course he didn’t know. It wasn’t like it was an everyday occurrence.

“I’ve transitioned to become an omega, to put it plainly.” Law answers, voice rough as he swallows tightly, attempting to regather his thoughts.

“That’s possible?” Shachi asks, brows sky-high and eyes sliding over to Penguin for a moment, before sliding back.

“Are you safe, Captain? Healthy?” Bepo asks, his anxiety seeping into his voice as he gives Law an analytical look over. He may not have Law’s powers, but he’d gotten a knack for spotting injuries and anomalies due to standing by Law’s side all these years.

“I should be. I’ve been checking myself over to find any abnormalities, but I guess I’ve been so exhausted that I missed it.” He admits, realizing now that every look through he’d done over himself had been half-assed due to not having the energy to fully take in the details. Details like differences in his reproductive organs. 

After another moment of thought, Law continues, “Though, I suppose an examination wouldn’t be a bad idea. I’ll probably just do it in the O.R.” He finishes, rubbing tattooed hands over his face in an attempt to rid some of the nerves now flooding his system. 

Almost sensing the bubbling anxiety, Bepo puts a hand on Law’s back and offers a determined look. 

“We’ll keep watch over the operating room, Captain. You’ll have the utmost privacy.” He affirms, a sharp nod of his head signaling the others to offer their own.

“We’ve got your back, Cap!” 

“Nothing’s getting through us!” 

A moment of silence followed by a sigh is all Law can manage to get out at first, finding the entire situation mortifying. More-so for the fact that he hadn’t seen the signs as what they were sooner, and that he had to wait for others to point out the symptoms.

One more sip of coffee, and a deep breath later, all four of them found themselves outside the operating room. The trip to the room deeper within the Tang had given Law time to truly think about things, and not just through an anxious lens, but a logical one. 

Realistically, there was no fundamental part of his routine that was going to change now that he was an omega. He already had ruts, so there was already a portion of time every other month that he had to dedicate to keeping himself under control, he’d just have that same inconvenience monthly instead of bi-monthly. Heats could be held at bay as long he used suppressants and was cautious, which he already provided for other omegas aboard the Tang. 

As terrified as Law was about the entire ordeal, breaking things up more logically helped to destigmatize the change, making it more manageable to process.

The examination process was a thorough one, but since he was mostly familiar with what his scans usually looked like, it was easy to see the differences now. His vital organs remained unchanged and everything seemed to be functioning at top quality, but there was one area that was completely fresh to him. A womb that now nestled inside of his pelvic bones.

It was fascinating, in a medical sense. He knew of intersex bodies and some of the variations that it entailed, but it was different to see it like this– in himself.

The information overload had still remained, but he at least had enough answers that his anxiety slowed.

Upon this realization, he makes his way back to the doors that Penguin and Shachi were all standing outside of and knocks to let them know he was finished.

“So, Cap, how’d it go?” Shachi starts, his head tilting slightly in curiosity, while Penguin is quick to follow up on his sentence. 

“See any abnormalities or does everything look normal?” Penguin asks, attempting to try and break down the neutral look that had come over Law’s features.

“Everything looks fine, besides a new organ. Though, I might want to get another pair of eyes on things just to be sure.” Law adds, his thoughts already thinking about who he might reach out to and how he was going to word it. “Admittedly, I don’t know that much about this circumstance, so I figure it might be better to rule out all possibilities of me missing something important.

The admittance wasn’t necessarily out of character, but it did give insight into how nervous their Captain was– and for good reason. He wasn’t one to take his chances with potential health risks.

“Who’d you have in mind?” Penguin prompts, hands finding their way to his hips as he looks over to Law’s pinched brow expression.

“Chopper.” Law answers simply, pushing past the wide eyed expressions that they both wore in favor of heading back to the Control Room in order to get access to the Strawhats transponder snail.

Pere Pere Pere. Pere Pere Pere.

Click

“Hello, this is Robin speaking.” A feminine voice answers, tone patient and unbothered.

“Nico-ya. Does your crew’s doctor happen to be on board?” Law asks, desperately wanting the devil fruit user nowhere near the phone when he explains to Chopper on why he’s calling and is asking for an examination as soon as possible. 

“He is. Would you like me to grab him?” She asks, the slightest hint of intrigue slipping into her tone.

“That’d be great, thanks.” Law answers, tone even tighter than before. If anyone was going to pry details out of him just based on the words that he spoke, it’d be Robin. She had a interesting way of pulling the slightest bits of information out of people, and he didn’t fancy being the object of her interest at the moment.

“Of course, Trafalgar.” She answers, before the line goes silent.

After a few moments of hearing his own heartbeat pound wildly in his own ears, the transponder snail rings again, and Law picks it up almost instantly.

“Torao! Robin said that you wanted to talk to me?” Chopper’s chipper voice sounds over the line. Upon listening closely and not hearing any other shuffling, Law lets out a sigh of relief. 

“Yes, I did. I need you to give me an examination and run a few tests for me.” He explains, hoping that the other doctor wouldn’t ask a ridiculous amount of questions, but knew that the younger doctor’s naivety and curiosity often got the best of him. 

“Are you sick? Did something happen?” The younger doctor asks immediately, worry shrouding his words.

“I’m not ill, but I believe there’s been a change. I know of one, but I want to be sure that there’s no other changes that I’m unaware of. I need another pair of experienced eyes looking over everything, which is why I’m asking you..” Law tacks on, being sure to add in the small mention of praise in attempt to get Chopper’s attention off of his vagueness.

"Don’t expect me to get all flustered just because you complimented me!” 

A perfect success. Law notes with a sense of accomplishment. 

“Well, I can definitely run whatever tests you need, but I’m sure you’ve already done a thorough job on your own.” Chopper near beams through the transponder snail. 

“Perfect. Have your navigator send coordinates for a meet-up spot to Bepo. I’ll see you shortly, Chopper-ya.” Law finishes, taking Chopper’s affirmative hum over the phone as confirmation before sighing and sinking a little into his chair. 

He was finally going to get some solid answers, but at what cost…

It had nearly been a week since the call with Chopper, and the Tang’s periscope had finally caught sight of the Thousand Sunny in the distance, meaning that it was time to surface.

The hallways were a flurry of bodies as everyone moved on muscle memory in order to prep the ship for surfacing. The well-oiled machine that the Heart Pirates were had easily gotten them through the motions, allowing the submarine to surface effortlessly. 

A few minutes after breaching, Law had made his way out on deck with Kikoku in hand. He’d wanted to get into the doctor’s clinic as quickly as possible without having to answer any ridiculous questions from the too-nosey Strawhat pirates. Though, the closer they got, and as soon as Law raised his hand in order to shambles himself onto the ship, he heard a call of the stupid nickname that Luffy had given him. 

“Toraooooooooo!”

That single word was all he heard before he saw a figure flinging towards the Tang– towards him. It was barely enough time for him to brace for impact as Luffy slammed into him, rubber arms stretching and wrapping Law into a vice grip. The younger’s face rubbed up happily against his own as the two connected. 

“Strawhat-ya, get off .” Law grumbled, attempting to wrench a hand free to peel Luffy off of him, but unable to with how determined the younger was to keep him put.

“I missed you, Torao! I was so surprised when Chopper told Nami that we were meeting up,” Luffy starts, rambling loudly within the vicinity of his entire crew that was now making their way onto the deck, as well as the soon-to-be Strawhat pirates as they neared the Thousand Sunny, “but he said that he had to give you an exam thing because something changed-” He continues, only to be cut off by Law once more. 

“ Shut up, Luffy-ya.” Law grits out sharply, only realizing after the words were spoken that he could no longer put an alpha timbre behind them anymore. How frustrating.

Luffy was less interested in what Law had to say, and was now much more interested in shoving his nose directly into Law’s partially hidden scent gland. He had just nosed at it at first, but was now taking in full whiffs as he had managed to move the fabric just out of the way enough to experience the new scent. 

“You smell different, Torao.” Luffy states, the subtle tone shift in his voice only being noticeable due to the shiver that ran down Law’s spine. 

He wasn’t fast enough, or strong enough apparently, to wiggle his way out of Luffy’s grasp despite how much he was shifting now to shut the younger alpha up–especially as they pulled as flush against the Thousand Sunny as they could without colliding. 

“You smell good. ” Luffy commented, voice much quieter as he inhaled that sweetened scent of Law’s deeply, truly seeming to savor the scent this time. This time, Law could feel his knees buckling as Luffy had pushed his scent in order to mix with his own. The beautiful weather had felt too humid all the sudden, and Law could’ve sworn he felt himself sweating. 

At this point, all of the Strawhat pirates were on the deck of the ship and were within scent range of Law. 

This was bad. This was really bad.

“Oi, Traffy, your scent changed.” Zoro comments, stepping up to the rail of the ship as he notices the shift of scent in the air. 

“Yeah.. it’s a bit sweeter.” Nami comments, hanging over her spot on the rail further up as she looks down to the now omega. 

"How interesting.." Robin adds in, even going as far as to fully close the book that she had been reading. 

Wonderful. All three of the other Alphas on the crew have already sniffed me out.

Luffy didn’t move far from Law’s scent gland, finding himself almost zeroed in it. There was some kind of urge that began to itch under his skin, but he couldn’t quite pin it down. He knew that Law was an alpha, but what he was feeling was so similar to how Zoro and Nami described what alphas attracted to unmated omegas felt like. 

As if there was some kind of divine intervention, Sanji quickly, and unknowingly, came to his rescue by shouting out that the food he’d been making for the arrival of the other crew had been finished and was being served. The distraction had loosened Luffy’s grasp enough for Law to break free and immediately switch himself with one of the blankets that had been draped over the small bed in the clinic. 

“Ah!” The younger cried out as Law dropped onto the bed, nearly losing his grip on a glass vial he’d been preparing and jumped slightly. 

Law had given himself and the doctor across the room a moment for both of them to catch their breath before speaking up. 

“Forgive the intrusion, your crew was getting a little too curious about my condition for my liking.” Law apologizes, straightening his sweatshirt out, and sitting up tall. 

“It’s okay! I just wasn’t expecting you so abruptly!” The reindeer beams, his shoulders relaxing as the tension in them left, “Well, if you’re ready, why don’t we get those tests done?”

The talking was kept to a minimum, thankfully, with Chopper only asking medical questions when necessary. It started off with basic questions, what unusual symptoms have you experienced, and the like before turning to more intimate questions, have you noticed any changes like the secretion of slick, or have you experienced a partial or full heat. Law answered accordingly, attempting to will away the blush that was slowly creeping onto his cheeks. 

After a half hour of testing and a full body examination, Chopper had finished, and found no abnormalities. Everything was perfectly functional and healthy, and it had even looked like his transition was smoother than other cases he’s read about in the past. It turned out that the Dr. Kureha, who had kept Chopper as an apprentice had him read about all different kinds of body types and cases about secondary genders, as he should be as well-informed in case of an emergency where the knowledge was needed. 

“Like I said, everything looks normal and functioning well, but there is one thing I’m concerned about.” Chopper admits, spinning back around in his chair in order to hop down to stand next to the bed. 

“What are your concerns?” Law asks, his fingers finding themselves fiddling with the remnants of fear that he was still working on calming. 

“Well, it’s just strange that you haven’t had your first heat yet…” Chopper pauses before putting a hoof to his chin in thought, “Usually, when an alpha transitions to an omega, the body starts the chemical change first before the internal organs rearrange to make space for the uterus to form, which was when you were experiencing sharp abdominal cramps, but after that settles, most freshly-presenting omegas go into their first heat. Honestly, it’s when a lot of omegas realize that they’ve transitioned.” He finishes, eyes sliding back to Law with a focused expression. 

“What does that mean for me? Do you think it’s being delayed for some reason?” Law asks, wanting to be aware of any set-backs on his body that were to come. 

“Maybe, but I don’t think that’s the case. I think you might’ve had some final components settling in, so your body hasn’t been ready for one yet,” Chopper starts before giving an affirmative nod, “but according to my findings, and the blood tests that we did, you’ve fully settled. So, you should be having a heat hitting you shortly.” 

Fuck. What stellar timing.

“Shortly? How shortly– a day, a week, a month?” Law asks, sitting forward in his seat as a sudden hyper awareness floods into him, every small fluctuation in temperature setting him on edge.

“Since you’re fully settled, I would say in a day or so.” Chopper explains, his expression shifting to one more of sympathy than before, especially as Law’s eyes frantically searched his own. “You… you said that Luffy’s the cause of your transition, right? It might be best to have him stay with you through your first heat, especially since your body accommodates itself for him.” 

In all honesty, Law hadn’t even considered spending his heat with anyone, just figuring he’d take some suppressants and lock himself in his quarters for the entire length of it, but now that it was brought up, the image of Luffy bitching him against that damned tree in the middle of nowhere sounded like heaven all over again. 

“I see.” Law responds instead, forcing his brain to reel in those dirty thoughts, keeping those to himself for later. He refused to give those thoughts another second in the presence of the naïve doctor in front of him. “Well, I suppose I should talk to Luffy-ya, then.”

“Actually, if you don’t mind, I think I should talk to Luffy about this too, if you’ll be spending your first heat together.” Chopper perks up, walking over to the door after receiving a somewhat hesitant nod of approval. 

To his credit, Chopper had called Luffy down somewhat discretely after picking up on Law’s aversion to the rest of the crew finding out. 

The crew had still been in the middle of eating what Sanji had prepared, so naturally Luffy had also been in the middle of eating. Determined to take one final serving to go, he snagged one more piece of meat before heading down to the clinic, somehow convinced that he was getting in trouble for something. 

“Whatever I did, I didn’t mean-” He starts, but before he could fully get the sentence out the scene unfolded before him.

Law had his head in his hands, refusing to pick his head up after Luffy walked in, and Chopper had a slightly embarrassed, yet determined expression on his face. 

“Why’s Torao hiding?” Luffy asks, cocking his head to the side as he looks between both doctors.

“Well, Luffy…” Chopper starts before delving into the intricacies of explaining how Luffy had bitched the older. The words Chopper had used had all been medical terms, attempting to stick to a professional point of view. He didn’t touch on any details, since he didn’t know much about the situation outside of the vague points Law shared, and naturally, it went right over Luffy’s head. 

Law felt like he couldn’t sink his head any deeper into his hands as the younger doctor continued, especially with Luffy’s silence following the end of Chopper’s explanation. 

After what had felt like hours, the older had finally steeled himself over enough to lift his head, letting amber eyes slide over to the wide, dark eyes that had gotten him into trouble from the very beginning. 

Luffy blinks a couple of times, looking in between Chopper and Law, before settling on the now omega. “So, he’s like a full omega now? Like with heats and everything like Sanji has?” He says, finally beginning to process everything that Chopper had explained. 

It felt like a weight of relief had slid off of Law’s shoulders at such an innocent question. Well, technically an intimate question, but he had at least spared the details of their romp in the forest. 

It was a miracle, honestly. 

“Precisely! Law’s body has fully adjusted to be an omega, and his heat should start any day now.” Chopper explains, seeming to be pleased that Luffy had understood his explanation. 

Luffy hums for a second, his brows pinching together as he makes the face he always does when deciding something. Law couldn’t tell exactly what he was choosing between, or even pondering at this point– it could’ve been anything. 

“So where are we staying for it? I know Sanji usually takes the first mate’s quarters with Zoro, but I dunno if we can clear out the captain’s quarters in time… We mainly use it for storage..” Luffy begins thinking aloud. 

A part of Law was impressed with Luffy being somewhat logical about the whole situation– he was thinking carefully, and even considering Law’s comfort in the decision-making process. The other part of him was incredulous, shocked by the immediate assumption that Luffy planned on spending his heat with him even without being prompted. 

“Wait to be asked first, idiot!” Law nearly splutters out, face lighting up in the rare flush that he always tries his hardest to hide. 

Luffy raises a brow for a moment, but then tips his head back to laugh. It was a stupidly melodic thing, his laugh, and it only served to redden his cheeks further. 

“But I thought I told you last time when we were in the woods, I want you to carry my pups– no matter how many times it takes.” Luffy affirms before Law even realizes that he’s bringing up that same damn phrase that got him bitched in the first place. 

“Luffy.” Law manages to grit it, jaw clenched tight with embarrassment as Chopper’s spine straightens an unhealthy amount.

“Oh wow! Did you hear that? I think I heard Zoro calling for me!” Chopper scrambles, brushing his paws off onto his lab coat and bee-lining for the door, “I’m sure you can cover the details, right, Law?” He finishes, though not sticking around to hear the final answer. 

Luffy, on the other hand, looks between the now closing door and a clearly pissed off Law. 

“What? Why’re you all pissy with me?” Luffy pouts, his bottom lip puffing out at the sharp huff that slips through Law’s lips. 

Something that Law had been trying to reason with himself lately was that not every battle was worth fighting, and this one was certainly not worth it. Chopper had some level of awareness as to how it happened, but it wasn’t like he needed a full re-telling of how he was bitched. 

“I’m going to pretend that you didn’t just tell your doctor that you plan to inseminate me to the point of conception, and we’re going to figure out a place for me to nest.” He says, the omega term feeling almost foreign on his tongue, especially regarding himself. 

“In-sem-i-huh?” Luffy asks back, head tilting akin to a confused puppy with a single brow raised. 

Luffy was incredibly lucky that Law had a not-so-well affinity for cute things, and even more-so that he was considered one of them. 

“Forget it. Let’s focus on what matters.” Law finishes, taking over the conversation before Luffy had any other chances to thoroughly make Law regret the decision to spend his heat with the younger alpha. 

The conversation had gone rather smoothly between the two, surprisingly enough. Luffy’s concerns with staying on the Sunny were understandable, and there wasn’t much room for privacy. The Sunny seemed to be more equipped to handle hosting a mixture of the Heart Pirates and the Strawhats, excluding those who wanted to stay further inland for the week that they would need to dock here. Law had voiced that he’d feel more comfortable having the Tang to himself, and Luffy when the urge occurred, and that nesting for the first time might be easier in a more familiar environment. 

Sure, he’d spent a fair share of time aboard the Thousand Sunny all those months ago, but it was still the Polar Tang that felt like home to him. 

So, Luffy had given his orders to his crew, and Law to his own, about docking for the week. An allowance had been given to the Heart Pirates to afford whatever restock they needed, rooms at an inn, and food for the week, and Nami had been delegated the same task for the Strawhats. Now that most of the intricacies were figured out between both crews, the realization that this was real and actually happening, those same waves of anxiety began to roll in once more. 

Before Law had gotten lost too deep in those feels, he felt a soft fabric being slipped into his just barely quaking hands. He blinked a couple of times to clear the haze before he recognized the yellow sash that Luffy had given him. 

“I dunno too much about nesting, but I know that when Sanji goes into heat he usually steals a lot of Zoro’s stuff,” He pauses, that sunshine bright smile slipping onto his features all too easily as he continues, “so I figured I’d just give you my stuff first so you don’t have to!” 

It was an incredibly thoughtful thing to do, and one that put Law a little at ease at the idea of spending his heat with Luffy. There was no debating on whether Luffy would please him enough, their last time together had been a clear example of that, but the small action went beyond just sexual pleasure– it was an act of comfort. 

“Thanks, Luffy-ya.” Law offers, eyes flicking up to meet Luffy once more, and damn if the bright expression on the other’s face forces his heart to nearly beat out of his chest. 

“Uh huh!” He answers quickly, a small nod accompanying the easy-going response. 

A moment of comfortable silence settled before Law had decided that he wanted to escape the feelings stirring up in his chest towards the other. 

“Well, I’m going to get myself ready on the Tang, but I’ll call when I need you.” He finally says, pushing his hands against his knees to stand up, not trusting his muscles enough to depend solely on strength. 

“You sure?” Luffy asks, expression dropping only the smallest amount. 

“Positive.” Law answers, forcing himself to look away from the slightly dejected look Luffy was giving him and focus on the more pressing matters at hand. Those matters being figuring out how nests were supposed to work in the first place. 

“M’kay~” The younger responds, the crease in his brow from the earlier disappointment wiped clean off of his face as he bounds towards the door, “I’ll be waiting for you, Torao!” Luffy finishes with a grin, before heading back towards the congregation of food and company on the upper deck of the Sunny. 

It was difficult to realize how much ease Luffy brought him until that feeling was gone, leaving emptiness and silence in its wake. Try as he might, Law knew that his body and mind had begun craving the sense of comfort, freedom that Luffy provided naturally. It almost felt like a deficiency in the weakest terms, and an addiction if Law was to be honest. 

That same feeling made itself known when the older omega made his way back to the now completely empty Tang. 

Despite the submarine being devoid of company, Law still loved the familiar embrace that the ship welcomed him with. Wolf had gifted the Heart Pirates the vessel years ago, and it had continued to hold a special place in his heart. 

The absence of potential prying eyes paved room for vulnerability, and that was a concept that absolutely terrified Law. It was most likely what terrified Law the most about having heats. A rut was one thing, just having urges that were simple enough to whittle down, but a heat required opening yourself up to someone fully, a privilege that few would ever receive from Law. 

Vulnerability had been reserved for Bepo, Penguin, Shachi, and now, Luffy. That fact remained ringing in his mind as his grip around the yellow sash wrapped around his hand tightened.

What an eventful few months he’d had with the Captain of the Strawhat Pirates. 

One thought drifted into the next and in effort to try and prevent himself from spiraling, he began to head down to clean up the captain’s quarters. It wasn’t necessarily messy by any means, but if they were both mainly going to hole up in there, a bit of cleaning might do them both some good. 

While Law was cleaning up, he noticed a note and a small metallic crate shoved under his desk. The note had been from Bepo, Penguin, and Shachi.

Hey Cap! We know that an omega’s first heat can be pretty intense, so all three of us worked with Sanji to help make a sort of care package to help you through it! 

We’ll see you on the other side

~ Bepo, Penguin, Shachi

If Law ignored that fact that he felt ridiculously embarrassed, it was incredibly endearing that they’d all worked together to put something like that together.

The sentiment stayed with him as he began picking up strewn pieces of fabric from around the room. Loose shirts, some stray sweatshirts, and the occasional blanket from his desk chair that his crewmates throw over him when he overworks and falls asleep while reading. It wasn’t intentional, but eventually every piece of soft cloth in the room has been piled on his bed. 

There was some kind of instinct that had flared up at the sight and he began rearranging the fabrics until things had felt right and like they were meant to be there. 

The nest had begun taking shape soon after the futzing had started, and after a half hour, he was curling up inside the small pile he’d made.

It hadn’t taken long for Law’s inner omega to slowly begin taking control of his movements, just like his instincts to put a nest together. The small collection of soft and warm fabrics, paired with Luffy’s sash on his person, had felt comfortable, safe, and right . Enough so to where he finally felt content and had drifted off to sleep. 

What had started as comfortable sleep had turned into feeling a little warm, and feeling a little warm had shifted into feeling an unbearable heat. There had been nights in the past where Law had been forced to twist and turn, especially when they were submerged for a while, and endure the heat, but this was a step above those restless nights. 

After barely three hours of sleep, he had been forced awake with a pained gasp at the sensation of searing pain ripping through him from nape to navel. Disheveled, confused, and disgustingly sticky, Law had tried focusing his eyes on his surroundings– a task which had seemed impossible with the incessant throb from his groin that was becoming annoyingly consistent. 

“Shit..” Law gritted out, grimacing as another wave of pain struck through him. 

A tattooed hand reached outside of the nest he’d crafted around himself and patted around for the transponder snail he’d purposefully left there. It had taken a moment, but upon finally making contact with it he’d quickly rung the other line. 

Pere Pere Pere… Pere Pere-

“What?” came the aloof, blunt tone of Zoro’s voice over the line. 

“Luffy-” Law starts before biting down another pained gasp, “-get me Luffy.” 

Alpha, alpha, alpha– need him. I need Luffy.

He was in far too much pain to care about how pathetic his thoughts had sounded. 

“Oh, Traffy. Right. I’ll send him over. Luf-” Zoro begins to call out before the line goes dead. 

Unable to delegate enough strength to hold the receiver any longer, Law let it slip from his hands. Most of the strength left in his body had been shifted into desperately starting to push any and every layer of clothing off of his body. 

A mixture of sweat and slick began to mix as Law moved, slipping out of his hole and down his thighs. The feeling alone would’ve caught him off-guard if it wasn’t for the way he’d moaned out at the wave of euphoria he’d felt as cold air hit his skin. The feeling didn’t last long as another took its place– emptiness . 

He’d thought about being filled again by Luffy, but this was beyond an itch he’d like scratched again, this was a carnal desire. It was as if every nerve ending in his body was standing on edge just waiting for his alpha to stretch him out and fill him to the brim with his seed. To breed him. 

Fuck. When did he start thinking of Luffy as his alpha?

Far too lost in his delusions, Law hadn’t realized he’d pushed himself onto his hands and knees, and began reaching his hand back to where he’d ached so deeply. When tattooed digits made contact with his fluttering hole and just barely dipped inside, his arms had lost their strength and he’d dropped flush against the mattress, hips still high in the air. It was a humiliating position, but he was too distracted thinking about how good Luffy would feel if he took him like this. 

Time had seemed to drag on as Law took not one, not two, but three fingers as easily as if he’d been stretched only hours prior. The stretch had felt so good, and every inch he went deeper, the less his back and his groin ached. The glide of slick fingers against his aching walls had stolen his attention away from the eager alpha who had just boarded the Polar Tang. 

Luffy had easily followed the sweet scent of an omega in heat, and found himself walking a little faster with each wave of the scent that he’d caught. After a few twists and turns down maze-like hallways, the alpha finally pinpoints which room the scent is coming from– and Law is lucky that he’d had the decency to fling the door open instead of ripping it off of its damn hinges. 

When the door had swung open, Luffy had been greeted with a sight that he didn’t think he’d ever forget. 

Law was face down, ass up, and had just finished pushing a fourth finger down to the hilt as he let out a downright filthy whine slip through spit-slicked lips. His eyes were glassy and tear-filled as they rolled back at the slight sting of stretch, and there was just the smallest shiver that wracked through him as his wrist stilled. 

The intense wave of Luffy’s scent rolling off of him in response to Law’s own is what alerted him to the alpha’s presence far before he’d pushed the door open.

“Lu-ya…” Law whispers out, voice hoarse and quiet due to his lewd ministrations, “I’m so empty..” Law whines out, ever so slowly shifting his hips and drawing attention to the way his hole dripped over already slick fingers.

Luffy had never seen something so erotic in his life, and now he wasn’t sure if he could live without the sight of a heat-wrecked Law spread open for him in his nest begging for him. 

“So pretty, Torao… You look so pretty spread out for me like this..” Luffy praises the older omega, near salivating as he makes his way over to where Law had nested. Each step felt difficult, the thick scent of absinthe and sandalwood filling his senses to the point of dizziness. Even breathing had felt manual as he finally made contact with soft sheets.

Law had all but preened at the praise, legs spreading a little wider and back bowing a little deeper as one of Luffy’s hands ghosted over the meat of his thigh. Every touch from the alpha, no matter how light, had felt deliciously cold against his overheated skin. 

“ Lu-yaaa” Law groaned out, hips pushing back into Luffy’s hands as he shoved his face into the pillow below him, desperate to chase whatever form of relief Luffy would offer him. 

The enthusiastic roll of his omega’s hips against his hands prompted them to roam across his back, running over his hips, and just barely brushing the sensitive skin on the underside of his hard cock that spilled pre-come prettily onto the sheets. 

The sight had made him ravenous, his dark brown eyes almost black at the feeling of Law’s hips stuttering against him. The rush of arousal that rolled through him had him easily filling out beneath his loose shorts. 

“You have no idea how delicious you look right now…” Luffy starts, more than happy to indulge himself on such a beautifully presented meal, “I’ll fill you later, but lemme taste you first.” The alpha finishes, not offering any room for argument as he dives in. 

The strong muscle swirls and swipes from his drooling hole to the base of his balls, thoroughly devouring every drop of slick that he could reach. The taste was unreal, like the sweetest, most addicting flavor that he’d ever had the pleasure of sampling. A flavor that he wouldn’t let anyone else drip onto anyone else’s tongue.  

Mine.

A growl mixed with a groan vibrated against Law and immediately had him pitching his hips forward, nearly overwhelmed by the sensation before Luffy’s strong hands reached for him and placed a bruising grip on his hips. It was a rough and possessive touch, one that sent Law’s instincts wild with desperation. 

“Don’t run away just yet, Torao, I’m not finished yet.” Luffy hums, before delving back into his meal. 

“ Fuuu-” Law had groaned, nowhere near prepared for the onslaught of a tempo that Luffy had already worked up to.

Luffy was well-known for being a voracious eater, something that Law had found out not only while temporarily staying aboard the Thousand Sunny, but something he became intimately familiar with as the night continued.

While he hadn’t needed to be stretched, especially with how his body now expanded to comfortably accommodate his alpha’s knot, Luffy wasn’t hearing reason. He’d thoroughly devoured Law like he was a starving man and the omega was the first meal he’d seen in weeks. 

It was almost ridiculous how sensitive and reactive he was to the younger. Every slide of fingers ghosting his skin, every press of his warm digits on sensitive spots that left bruises blooming in their wake, hadn’t helped in Law’s attempt to maintain sanity. He had been reduced down to blubbering words and tears sliding down his cheeks as he was ravished. 

He’d begged and cried for Luffy’s fingers, for his knot, as the alpha made him cum over and over again on his tongue, but Luffy hadn’t listened. It was clear that he’d had his own interests in mind to attend to first. 

After Law had finally started to come down from the intense waves of euphoria, he finally felt something prodding at his entrance that wasn’t the alpha’s tongue. Reduced to noises alone, Law had let out a cross between a whine and a whimper as what he assumed were Luffy’s fingers breached him. The slick that had been dripping out of him at a steady rate made the glide impossibly smooth, allowing the younger to press fingers directly into his sweet spot without much trouble at all. 

The feeling couldn’t be described as anything but toe-curling as a wave of white-hot pleasure washed over him again. His thoughts had been reduced Luffy’s name as the alpha’s fingers fucked any other thought right out the window. 

Luffy had continuously indulged himself with every part of Law that he got to see so eagerly spread in front of him. The two orgasms he’d pushed Law into with his tongue had at first been due to the mere taste of him, but the second one had been to hear the way that the older man had cried out for his knot. 

There was something different about the way that Luffy craved Law this time around. It was desperate, but not in an immediate way for Luffy– in a curious way. He wanted to watch all the ways that Law fell apart by his hands. 

Despite his curiosity, his cock throbbed almost painfully as it bobbed against his stomach in time with the thrusts of his wrists. It was only then that Luffy finally heard the way Law had begun babbling again. 

“ Please , Lu- Lu-ya I just want your knot- please , I’ll be so good-” Law choked out, hips wriggling weakly in the air as he attempted to entice the alpha as best as he could. 

Who could deny such a pretty request?

“I know you will, Torao, I know.” Luffy chuffs, pleased to see his omega so pliant and ready for him to take– to fill. 

It was almost too easy to mount the omega, to kneel on the bed and line himself up to Law’s fluttering hole before finally pushing in– giving into what he’d been depriving them both of for so long. 

The melodic sounds of their groans of pleasure harmonizing fills the room, the feeling of inch after inch of Luffy’s throbbing cock slipping into Law’s tight, wet heat was almost enough to push Law to the edge immediately, but he refrained when Luffy had wrapped a hand around the base of his cock and squeezed. 

“ Luffy-! Nooo” Law whined out, feeling fresh tears begin to slip down his cheeks at the prevention of his third orgasm, absolutely lost to the delusion of his heat. Luffy only rumbled a laugh above the omega in immediate response. 

“I want us to cum together, won’t you wait for me, Torao?” Luffy whispers out, giving a deep thrust of his hips in order to distract the omega from the denied finish. The distraction worked wonders as the omega only proceeded to drool onto the pillow below him. A perfect response, if Luffy were to say so. 

“That’s it, good boy, Torao. Such a good omega for me.” He immediately praised, lust filled eyes taking in every twitch and shiver that Law’s body made. He couldn’t stifle the urge to move one of his hands in order to run his fingers down Law’s spine, delicately tracing the ink that decorated his skin as his hips rocked into the other slow. 

Beautiful. Law was so beautiful like this.  

Luffy’s thrusts had been slow and explorative at first, as he actually wanted to feel Law this time around without having too clouded of a mind. Though, that sentiment didn’t last long. He found himself picking up the pace in tandem with Law’s desperate pleas for him to go faster, harder, deeper. Who was he to deny his omega such a delicious request?

The sound of skin slapping filled the air as Luffy’s hips met Law’s, his cock stretching the omega out in a way that the older had found he desperately needed. Each roll had made them both a little more delirious, succumbing to their internal desires with feverous intent.  

Regardless of the stark difference in their height, the alpha still doubled over Law and pushed deep into Law’s hole at a perfect angle. The hand that had been holding the base of Law’s cock moved to grab him by the throat, pulling his head up closer to Luffy’s own. The new position had Law unconsciously baring his neck, scent glands prettily on display right beneath him. 

The feeling of breath hitting the sensitive spot on his nape had Law shuddering in need. “Luffy…” He breathed out, glossy amber eyes closing as he felt Luffy’s answering rumble sound behind him. 

“You want it? You want me to mark you?” Luffy asks, breath harsh in Law’s ear as struggling to hold restraint. He was selfish, sure, and he’d desperately wanted to mark the omega up enough so that anyone within his radar knew who had reduced such a strong man down to his most vulnerable state like this. 

Yes. Yes yes yes. Need it, need his mark– need his scent all over me. Law’s brain answered immediately, his body already moving to bare his gland to the alpha railing him into the sheets. He could feel his own pulse beat harshly against Luffy’s grip on his throat. He’d have to remember to teach Luffy the correct spots to press later, but he was too lost in the sensation of Luffy’s body against his own. 

The alpha could read the body language Law was showing, knew that he had presented himself for a reason, but that wouldn’t do. He wanted to hear Law beg for it. 

“Say it, Torao. Tell me you want me to mark you, to scent you so deeply that everyone knows who fucks you so well.” Luffy presses, pointed canines scraping gently against Law’s gland, allowing his tongue to flick over it and savor the way Law shuddered. 

“Want it so bad- need it. Need you to mark me.” Law babbles out, his most honest desires slipping through his lips easily as his embarrassment had left him long ago. 

The omega could feel the devilish smile stretching over Luffy’s features as soon as the words left his lips. The idea of pleasing his mate had his inner omega preening, forcing him to bare his neck a little wider in every attempt to entice the alpha to claim him. 

Finally receiving permission to give into the instincts that had wanted so badly to mark Law up that long month ago, Luffy had lost himself to animalistic urges. 

His pace was rough, fucking up into Law with reckless abandon, moreso focused on breeding and marking the omega underneath him than taking things slow. The abrupt change in tempo had Law keening, mouth dropping open in a breathless moan as Luffy brought him closer and closer to the edge. 

“So good… so tight and perfect for me..” Luffy praised, jaw clenching as he felt himself nearing his finish, knot beginning to prod at Law’s abused hole. The additional stretch had Law eagerly pushing his hips back against the alpha, a melody of please ’s falling from the omega’s lips.

A few more thrusts later, the feeling of Luffy spilling into him and a flash of pain-turned pleasure spider-webbing from his nape had pushed Law over the edge for the third time tonight. Luffy’s deep groan of release rang out in the omega’s mind as he felt wave after wave of total euphoria wash over him. 

The silence in the room was drowned out by the sound of blood pumping furiously in Law’s ears, allowing him to fully savor the tingly feeling floating through him. As he began coming down, the feeling of Luffy lapping over the fresh wound in his gland finally grounded him. 

“Dunno if it’s normal or not, but even your blood tastes good.. It’s not fair.” Luffy mumbles out, the smear of scarlet on his lips when he pulls back. 

Law huffs out a laugh, letting his head drop down into the plush mattress beneath him as exhaustion took over.

Deeming his clean-up job finished, Luffy gently wrapped an arm around Law’s waist and tugged the two down to lay down on their side. The smaller of the two spooning Law comfortably as he nuzzled into the mating bond mark he’d just left. 

It was almost unsettling how natural the position had felt, especially with the two not having spent any time like this together before. Though, Law supposed, he should probably get used to it considering that they were mated now. 

Well, they would be after Law left his own mark on Luffy.

The soft moment hadn’t lasted long as Luffy’s stomach gurgled loudly, disrupting the peaceful quiet that had settled onto the room. 

“Seriously, Lu-ya?” Law snorted, shaking his head in amusement as the alpha whined behind him. 

“Whaat? M’ hungry…” Luffy retorted, only nuzzling deeper into Law’s neck. 

“If you can reach it, there’s food in the crate under the desk.” Law points out, stifling a yawn that had threatened to escape. 

Since when did he get tired like this?

He couldn’t exactly remember the following order of events, feeling his lids droop closed as Luffy’s stretched arm whizzed past him and towards the promise of a meal. Though his lover enthusiastically began to talk about being lucky to have Sanji’s cooking, he had felt himself drift off to a much-need, dreamless sleep.

~~

That sleep hadn’t lasted him long, and that was a lesson that Law had unfortunately learned over the course of the week, especially after he’d marked Luffy and completed their mating bond. 

His mind had only been filled with thoughts of Luffy and draining the alpha of every drop of spend that he could milk out.

Luckily enough, if anyone had been perfect to pair up with a bitched omega’s first heat, it had been Luffy and his monstrous stamina. Throughout the week, Law had become insatiable. Even as the week went on his heat only really spared him an hour or two at the most before flaring up again. 

That’s how they both ended up with two glasses of unfinished water and a half-eaten portion of onigiri neglected on the bed-side table as Luffy fucked his hips deep within Law’s walls.

It had started innocently, Luffy pulling Law into his lap as they ate, just wanting to be close to the older of the two, all until Law had accidentally shifted his hips against Luffy. It had devolved quickly into Law shoving the plates of food to the side and shutting up Luffy’s huffs of complaint by sinking down on his cock, demanding to be pumped full again. 

Already two orgasms of Law’s in, Luffy could feel as he neared the edge of indescribable pleasure. All of Law’s begging for his knot, for his pups, had put an enticing image in his head. 

The way his cock made Law’s stomach bulge had him imagining what he’d looked like a stomach swollen with his pups. The way his womb would stretch and grow to accommodate their offspring. That thought alone sent Luffy thrusting up sharply into Law, pressing deliciously against his sweet spot over and over again as he reached as deep inside of the omega as he could. 

“Luf- Luffy- if you don’t stop I’m gonna–” Law tried to get out through his post-orgasm haze, hands frantically trying to grasp any of the fabrics around him, some kind of way to ground himself.

“Cmon, Torao,. I know you can take it.” Luffy goaded the omega, the grip he’d had on Law only tightening as he felt the way he squeezed around him. 

“No–” Law tried again, “Feels like I’m gonna pee.” The new feeling had the omega switching gears , reaching for one of Luffy’s hands in order to get the other to slow down.

“Don’t care.” Luffy growled out, his thrusts only getting sharper the more Law scrambled on top of him. 

“Fuck, fuck, fuck! Lu-ya–!” Law shouts out, voice warped from tangled ecstasy and embarrassment, as he loses control of his bladder.

The display before him was too fucking hot. Luffy not only got to watch his gorgeous omega cum while riding his dick, his knot flirting with Law’s hole, but Law had gotten so lost in pleasure that he’d actually started pissing himself. The sight paired with the absolutely pathetic expression on Law’s face had pushed Luffy over the edge after a final thrust, his knot swelling and popping as that delicious wave of pure ecstasy washed over him.

He’d never had an orgasm hit him quite this hard, and for the first time in the week, he’d actually felt his entire body beginning to truly cool down. It had taken several uncounted minutes for the floaty feeling to stop and for the feeling to come back into his extremities. A few deep breaths later, Law had slumped down next to the alpha, trying his best to avoid the mess he’d made on Luffy and parts of the sheets.

“Torao, that was so hot…” Luffy breathes out, blinking away the stars in his vision.

An unamused, exhausted huff sounds from Law’s chest in response.

“I’m not sure whether to be shocked or not that you’d be into such a disgusting display.” Law retorts, his head turning to the side to look over at the positively glowing alpha next to him. 

“Didn’t feel gross in the moment… “ Luffy mumbled back, not being too put off by the feeling of Law’s piss settling on his skin.

“Well, you’ve gotta shower before you come anywhere near me again. I’m not risking a UTI because you have an aversion to hygiene.” Law states, lashes fluttering shut as exhaustion takes over him. 

“No fair!” 

“Very fair.”

A displeased huff is all Law gets in response to Luffy shifting to pull himself out of bed. He wraps an arm around Law’s waist in order to scoop him up and take him along for the trip. 

“C’mon, I gotta clean you up, too.” Luffy adds, and Law’s heart just about melts on the spot all over again.

~~

The week had been a whirlwind of pure desire, sweat-slicked skin slapping, and new levels of ecstasy that they’d both never dared to reach before. Both were coming out of it thoroughly exhausted and sore. Luffy’s stamina was insane enough to have actually kept up with Law’s first - very intense - heat and they were both experiencing the repercussions now that the haze of heat and rut no longer impaired them.

Despite lingering aches and pains, things finally felt like they were back to normal when the two exited the Polar Tang. Each proudly sported the healing wound of a fresh mating bond that signified their devotion to each other. 

Luffy had opted to proudly show his off, immediately running up to Zoro to display the mark once reuniting with his crew for the first time in a week. The slightly older Alpha gave him a wide grin and a clap to the shoulder, happy to see Luffy so happy and proud of mate. 

Law, on the other hand, had his own crewmates pointing out the change in scent once more before they’d a glimpse of the fresh scar. Penguin and Shachi had fawned over their captain finally finding someone trustworthy enough to mate with while Bepo had sobbed and squeezed his captain tightly. 

It was a heart-warming affair, despite both of them treading into new waters. In spite of the unknown ahead of them, they both found solace in the knowledge that they’d face it together.