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"Kei, I think something's wrong,"

"Hm?" Keigo looks up from where he had previously been sorting through numerous emails to see Dabi holding a towel in front of him. His eyes are wide and full of fear as he stares back at the bird.

"We need to go to the hospital,"

"What? Why?"

"We just do ,"

Keigo narrows his eyes as he turns in his chair. With one hand leaning over the backrest, he uses the other to try and tug away the towel that Dabi holds so tightly.

"No, no, no, no,"

"Let me see,"

"Absolutely fucking not. We're going to the hospital,"

Curious, Keigo slowly stands from his chair as Dabi suspiciously steps back. It takes a few steps back for Dabi to break out into a run as he darts into the bathroom and slams the door in Keigo's face. He sounds like he's in pain as he whimpers behind the door.

"Dabi,"

"Fuck off,"

"Just tell me what's happened,"

Silence.

Feeling defeated, Keigo leans against the bathroom door with a heavy sigh. Dabi's been out today, and he said he'd gotten into a small fight with a hero. But when he returned, there wasn't any sign or reason to believe that he'd got himself seriously injured. 

"Did you get hurt?" Keigo guesses with a worried tone. Knowing Dabi, he'd end up getting himself stabbed and manage to hide it until Keigo somehow figures it out.

"No,"

"Are you sure?"

"Yes,"

Another heavy sigh. This constant back and forth is getting them nowhere. So, Keigo decides the only option is to break the lock. Silently, he pulls out a feather and jams it into the side of the door until it clicks. But Dabi is already in the process of opening it himself, so Keigo ends up falling face-first on the floor just by Dabi's feet.

"What are you doing?" Dabi asks with that same stern tone that makes shivers run up Keigo's spine as if he hadn't just locked himself away in here in a tantrum.

"Nothing," Keigo responds as he looks up. And that's when he sees it. "Oh my god ,"

"You don't have to stare at it,"

"No, I'm not, I just--"

It appears that Dabi has been hit with some kind of sizing quirk. Dabi had been examining the damage in the bathroom alone, so his cock sits flush against his lower stomach with the veins practically protruding from it. His size hasn't just doubled, it's quadrupled until the skin stretches to a blush tone of pink and red.

Keigo can't bring his eyes away from it, but eventually, he has to. When his heavy gaze finally moves upward, he sees that amused glint in Dabi's cool-toned eyes and that lust that practically swims in a sea of turquoise.

"You still wanna go to the hospital?" Keigo asks quietly.

"No,"

"You sure? I can still take you,"

He's trying so desperately not to make Dabi feel any more ashamed or uncomfortable, but with his massive cock literally looming over him - it's a little difficult.

"You have medical training. Why don't you take care of me?" Dabi smirks with a tilt of his head. "I don't think it's too serious. Maybe some personal care would help?"

"Well," Keigo says before he thickly swallows. "There are a number of personal care routines. Which one were you hoping for?"

As Dabi steps closer, he wraps a hand around the length of his swollen cock and traces it across Keigo's bottom lip. With the sudden size difference, his usually large hand is swallowed in comparison. Pre spills over Keigo's lips before he licks it away. He doesn't need to be told what to do, Dabi has him trained well enough to understand.

Usually, Keigo is able to effortlessly get Dabi's length to the back of his throat. It took months for him to train and when he finally managed it, Dabi praised him with his cock heavy on his tongue. But now, with the quirk running through Dabi's body, it's much harder to even get his lips around the head.

Keigo opens his mouth wide as he struggles to edge every inch inside. He casts a strained look at Dabi, but he only returns it with a smirk. Asshole.

He has to pull off soon after with an aggravated groan. "It won't fit,"

"You sure about that, Birdie?"

"Pretty sure," Keigo snaps. "How did this even happen ?"

"Sizing quirk? I don't know. All I know is that he hit me with it and it started growing. It didn't get this… Big , until I got back home,"

"Does it hurt?"

Dabi just shakes his head.

Confused about how to even approach it, Keigo sits back on his feet and just stares at it for a moment. Then he sits up on his knees, wraps both hands around the base, and sucks on the tip.

"Oh, fuck ," Dabi softly groans. A hand tightens in Keigo's hair as he gently thrusts his hips forward. "Uh, huh, just like that, Birdie,"

Keigo hums against Dabi's tip, sending deep vibrations throughout his body. He doesn't think he's ever seen Dabi's thighs shake before, but the man has to move back until he can lean against the sink, with Keigo following on his knees. Small hands pump Dabi's base, occasionally dropping down to fondle his overly-large balls. His mouth stretches painfully as he wraps his lips further around the head, but he can only get around three inches in before it feels like his lips will split.

He pulls away with a gasp and pitifully shakes his head. "I can't," he murmurs. "It won't fit,"

"I know where it'll fit," Dabi practically growls as he pulls Keigo to his feet. He turns the man and slams him back against the sink before stripping him completely. Beside the sink is a chest of drawers that Dabi impatiently rummages around in to dig out a squirty bottle of lube.

"It won't fit ," Keigo tries to tell him, but he's silenced by a thick growl.

"You think I'm gonna get hit by a sizing quirk and pass up the opportunity to fuck you with it? Birdie, you are sorely mistaken,"

"If it won't fit in my mouth, I highly doubt it'll fit anywhere else,"

Dabi ignores him as he coats his cock's length in a thick layer of lube. The droplets run down and fall to the floor as Dabi trails his fingers over it to gather up more lube on his fingers. Keigo's leg is quickly propped up on the edge of the bath before Dabi runs his fingers around Keigo's rim. As they slowly push in, Dabi impatiently scissors them apart.

"You won't listen to me will you?" Keigo gasps.

"No,"

Dabi's fingers pump in and out of Keigo's hole, occasionally spreading apart and twirling in circles until he deems it enough. It probably isn't, but Dabi's never been known for his patience.

"I'm telling you, it won't fit,"

"I'll make it fit," Dabi growls as he shoves his cock so fast and so deep inside of Keigo that the bird has to weakly grip Dabi's shoulders to stop himself from falling. The stretch is so painfully good and although it feels like he's being torn up from the inside out, he can't help the strangled moans that escape from his parted lips.

"Told you it would fit,"

Keigo can only respond with a groan as he weakly grips Dabi's shoulders.

When Dabi tries to thrust up, Keigo's nails dig into Dabi's skin as he shakes his head. In broken gasps, he manages to say, "please- wait, just- wait,"

"You wanna be my little cock warmer for a little bit, Birdie?" Dabi teases. "Can't handle it?"

"No," Keigo groans quietly.

Dabi's cruel chuckle makes Keigo shiver and his thighs tremble. He can just about breathe with the stretch and every time he or Dabi moves, he lets out a gasp.

"Please, let me fuck you, Birdie," Dabi whispers against Keigo's bare neck. His teeth drag against hot skin before he says, "I'm desperate,"

"It's too m-much," tears are gathering in Keigo's eyes and as he squeezes them shut, they run down his cheeks. "I'm so full ,"

"I can't wait," Dabi groans as he begins to slowly thrust in and out. "I can't, you feel so fucking good,"

Each thrust hits Keigo's prostate without Dabi even trying to. His thick cock-head runs against it and his veins drag across Keigo's skin. He weakly grips Dabi's shoulders, his nails digging into his scarred skin. Every moan comes out breathless and strained.

"Oh, fuck ," Dabi grunts. With both hands, he pulls Keigo away from the sink so that both of his legs weakly wrap around Dabi's waist. "This feels so good, Birdie, you have no fucking idea ,"

"Uh huh,"

"You gonna let me fill you up, baby?"

"Uh huh,"

Keigo is honestly too overwhelmed to respond with much else. Every thrust fills him up so sweetly yet so sharply. The stretch is too much for him to handle as he softly cries and moans into the crook of Dabi's neck. "Please," he whines. "I'm so full,"

"Gonna fill you up even more," Dabi growls.

Keigo just cries in response, his legs tightening around Dabi's waist to bring him closer, deeper. "Oh my god," he gasps. "Oh my god ,"

"No," Dabi whispers as he pulls out, allowing his tip to just barely graze against Keigo's hole. "I don't wanna come yet,"

A soft whine escapes Keigo's lips as he cries a little harder. He can't manage to say much else than oh my god , so he just shakes his head and clings to Dabi's shoulders. Dabi's cock-head presses against Keigo's skin, teasing the idea of fucking him all over again. Weakly, Keigo wiggles his hips to try and entice him.

"Stop it," Dabi softly growls.

Keigo does it again and again until a sharp slap comes down on his thigh. "I said stop it ,"

" Please ,"

"I need a minute to calm down,"

"No,"

"Birdie," Dabi grumbles as he takes a hand to turn Keigo's face to his. "Don't be a brat,"

"I want you to come," Keigo softly begs, pressing their foreheads together. "Please fill me up,"

Dabi practically snarls as he grips onto Keigo's ass to spread him open. His cock brushes against his hole with a wicked grin on his face. It's as if he wants to taunt Keigo, to break him down until he's tearful and screaming to be fucked. But then Dabi slams Keigo down on his cock so fast and so hard that Keigo comes with a loud, strangled whine. His prostate throbs and his cock spurts out strings of come, painting Dabi's stomach white. But the man doesn't stop pulling Keigo down on his cock and with every thrust, he hits Keigo's prostate, bringing him closer and closer to a second orgasm. Keigo's thighs tremble as his nails tear up Dabi's back. 

"Fuck, fuck, fuck ," Dabi growls through gritted teeth. He's practically foaming at the mouth and his eyes are blown out wide. He slams Keigo's hips against the sink and continues to relentlessly fuck into him, his hips wildly bucking back and forth. Their skin painfully slaps together, the sound echoing around the bathroom.

"Plea-se," Keigo sobs. "I'm gonna come ag-again,"

"Hold it, Birdie,"

"N- please ,"

"If you come now I won't fill you up,"

The threat forces Keigo to hold back his orgasm, though he can feel it building up and up to the point that it's painful for him to not have his release. Dabi's hips slam against Keigo's skin and his cock is practically throbbing inside of him.

" Please ,"

As Dabi gives one last thrust, he gives Keigo a quick nod that allows him to finally allow himself to come. Keigo's cock weakly leaks with such a small amount of come that it's pathetic. His hips stutter as his head falls back with a strained gasp. Tears stream down his face as quiet sobs bubble up from his throat.

Dabi presses his hips close to Keigo's, creating a thick seal to hold in the unbelievable amounts of come that shoot from Dabi's cock. Keigo has no choice but to lean back and feel his hot semen pooling up inside of him, filling him up until it stretches him out. 

"Fuck, there's so much," Dabi moans. "It won't stop ," he says as he pulls out and desperately looks down as his huge cock spurts out load after load of come. There's so much that it pools onto the floor and creates a large puddle. Now that the seal around Keigo's hole is broken, more of Dabi's come leaks out of him.

Keigo doesn't even get the chance to react before he's on his knees. His tongue delves deep inside of Keigo's hole to lap up the thick amounts of his own come. Keigo groans and weakly tries to pull away as Dabi growls against his skin. His tongue pushes deeper and deeper inside, forcing more come to seep out to run down his thighs. He's like a rabid animal as he digs his face between Keigo's legs, his tongue lapping up drop after drop.

"Dabi, st-stop,"

With a gasp, Dabi pulls away. Strings of come drip from his lips and his face is shiny and wet. The sight of him has Keigo's knees weakening as he collapses into Dabi's lap. Two small hands envelope Dabi's face to bring his rough lips to soft, allowing Keigo to taste the sweet saltiness of his and Dabi's sperm mixed together.

"Do you wanna go to the hospital now?"

Dabi's laugh rumbles in his chest as he grins.