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ganglylimbs · 4 years

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That Sweet Spring Heat

Fandom: My Hero Academia

Pairing: Katsuki Bakugou/Eijirou Kirishima

Summary: Spring had just begun to fully bloom, the air warming and flowers just starting to bud, when Kirishima Eijirou loses his goddamn mind and Bakugou Katsuki is not having it.

Warnings: Hybrid au, smut, breeding kink, no mpreg, dirty talk, cat hybrid Bakugou, dog hybrid Kirishima, lingerie, strength kink, slight feminization, bottom Bakugou, top Kirishima

Notes: A little more information than you need but the breeds of hybrids are:

Kirishima- A mutt (German Shepard/Rottweiler mixed with some lab blood) Bakugou- Purebred Dragon Li Cat (seriously, read the description for them. It fits him perfectly. Just more blond)

They don't show up a lot but I thought about this au for a bit so for the others: Urakara- A Shiba Inu (because they are round bois) Momo- Japanese Crane (her family seems very elegant and traditional and cranes seem very traditionally Japanese to me) Sero- Spider (because him shooting out tape reminds me about spiders shooting out silk) Ashido- Komodo Dragon (Basically my brain went, she has horns, they remind me of lizards, Komodo dragons are dangerous, she's dangerous, we have a match) Midoriya- Fuzzy Lop Rabbits (listen, I love all the fan art I see of rabbit Deku and his mask really does look like rabbit ears) Kaminari- Field Mouse (listen, I will not give up this headcanon) The two random OCs- Black Horn Sheep

Spring had just begun to fully bloom, the air warming and flowers just starting to bud, when Kirishima Eijirou loses his goddamn mind and Bakugou Katsuki is not having it.

Bakugou's blond fluffy ears lay flat on his hair, a vein popping along his forehead, his sleek tail flicking back and forth. His arms are crossed over his chest, staring down at his stupid ass boyfriend.

Kirishima stares back with bright eyes, a clueless grin on his lips as his large red tail thumps against the bed, ears perked. His full attention is on Bakugou.

They continue their staring contest for a full minute, in which Bakugou's scowl deepens and deepens.

Finally, he snaps. "Alright, you fuck, what’s up?"

Kirishima raises an eyebrow. "What?"

Bakugou throws his hands out, gesturing at all of him. "You! What's going on in that fucking brain of yours?"

Kirishima's tail slows down in its wagging, just a bit. "Ah, Bakugou, don’t be rude, man. I thought we were having fun." He wiggles his eyebrows.

"That’s not the point mutt-for-brains. You’ve been acting weird and I want to know why.”Bakugou's hands crackle and spark, a clear warning sign.

The effect is slightly weakened by the fact that they are both naked, Bakugou straddling Kirishima's hips, and Bakugou's thighs stained in Kirishima's cum.

Kirishima, because he's a goddamn idiot, ignores the warning explosions, his lightly hardened hands scratching at the skin of Bakugou's waist. He just tilts his head. "Babe, I really don't know what you mean."

Bakugou snarls. "Fine. Keep being weird." Then he climbs off that thick waist, stomping out of the room, Kirishima calling after him.

If Bakugou thinks about it, this whatever the hell is wrong with Kirishima started about a month ago, after one of the charity events their agency had set up.

Bakugou hadn't really been that interested in any of the interviews or journalists trying to catch his attention, no doubt most of them hoping that Ground Zero will give them some drama to report on. Instead, he had left that for the heroes like Red Riot and Deku and Alien Queen to handle.

He had chosen to focus more on why they are here. Children had been laughing and screaming and playing all around him, other heroes had been chasing after them or sitting to draw. He had seen Uravity throwing kids up in the air, letting them float for a bit before releasing and catching them. Creati had been making toys, laughing at the increasingly extravagant demands, her large white wings spreading out behind her in excitement. Cellophane had allowed himself to be strung up by his own tape, kids dancing around him.

A hand had yanked on one of his black sleeves, making him look down. A little girl, with wild curly black hair and narrowed brown eyes had frowned back at him. Two small horns peek through her mane and a small tail swished behind her, betraying her nerves.

He had knelt down, coming face to face with her, ears turning straight forward to show she had his full attention. "What do you need, squirt?"

Her eyes had narrowed even more. "My names not squirt ."

"Sure it isn't, squirt. Now, what are you bothering me for?"

She huffed and held up two wooden swords. "I want to play Pirates but none of the other kids want to play with me. They say I'm too rough."

Bakugou had given her a rueful grin. "Yeah? Well fu-frick them. I'll take you on."

She had gaped at him. "Really?"

Bakugou had snatched one of the wooden swords and stood to his full height. "Do you think you can take Ground Zero?"

She stared for a moment and then she had grinned, showing off her teeth. "Yeah!" Then she striked forward.

His sword had swept down to meet hers, making a wooden clack sound, and the two are off. They go back and forth, running all around the field, gaining and losing ground in waves.

When the girl is left panting, her dress covered in dirt and grass stains, Bakugou had finally allowed himself to be knocked to the ground.

She had taken the chance and had stabbed him in the stomach.

Bakugou had hissed and then his body relaxed against the ground. "Damn, ok, you got me, you got me. I give."

She giggled, before pointing her sword in the air, the other hand on her hip. "I did it! I defeated Ground Zero."

Bakugou chuckled, before grabbing her and bringing her close to lick at the dirt on her face, grooming her. "Yeah, yeah, squirt."

She smacks him with the sword, squirming. "Hey," he had said, letting her go.

She frowned down at him, putting her hands on her hips. "My name's not squirt . I won didn't I?"

He gave her a small smile. "Yeah, you did. You deserve more respect don't ya? So, do I get the honor of knowing who has beaten me?"

Her chest puffed out. "My name is-"

" Doi ."

Both of them had turned to see a harried-looking man jogging up to them. Kirishima right behind him a small frown on his face.

The girl, Doi Bakugou assumed, dropped her sword and had bite the bottom of her lip. Bakugou sat up, warily watching as the two approaches.

The man came to a stop right before them, huffing. "What did I tell you about being so forceful?" He turned to Bakuoug, bowing so low his curly horns almost touch his knees. "I'm sorry if she hurt you, sometimes she forgets her own strength-"

"It's fine," Bakugou interrupted, standing up and brushing the dirt off his costume. His tail lazily swayed behind him. "We were just having some fun."

The man had still looked unsure. Doi had been quiet, but she's had looked up at Bakugou now. "Are you really ok? I know she can-"

Bakugou waved off his apologies. "Yeah, of course. I'm a hero, aren't I? I can handle a little roughness. Besides, you have a great sword handler here." He made sure to catch Doi's eyes. "I hope you continue to work on them. You would make a good hero one day."

Her eyes had gone wide. "Do you really think so?"

"Of course," Bakugou had sniffed. "I never say anything I don't mean." Then he gave her a sharp smirk, hand ruffling through her hair. "Squirt."

"Hey!" She had gone to kick him, her father panicking again.

Bakugou had just laughed, ruffling her hair again. "Come back next year and show me how much you've improved."

"I will," she had promised. Then she had puffed out her chest. "And when I win again, you have to use my name."

"Promise."

Bakugou had watched the two of them go, Doi excitedly replaying all of their fight for her dad, who nervously smiled at her but a lot more relaxed than when he had first appeared.

He had turned to say something to Kirishima but is stopped short. Kirishima had been staring at him, eyes heavy and lidded with something that made Bakugou's throat go dry.

Then Kirishima blinked and he's back to normal, big goofy grin in place, his floppy ears bouncing as he walked forward to throw an arm over Bakugou's shoulder, bringing him closer. "Did you have fun, babe?"

Bakugou had grunt, side-eyeing him, not sure what that had been all about but not willing to let it ruin his good mood. "Sure."

Kirishima had just laughed and then they were swarmed by reporters and didn't have much of a chance to talk after that.

It's not that Bakugou is exactly bothered by what is happening. Kirishima has always been touchy, even before they started dating. He has wandering hands, that love to grope and grab at Bakugou and it's often Bakugou that has to remind him that they're in public, you idiot.

So he isn't bothered by the fact that, for the past month, Kirishima has been manhandling him more often, pushing and pulling him into positions or trying to bend him over their furniture. He isn't bothered by the fact that Kirishima will come up behind him, arms around his waist, as he presses kisses into his sensitive neck.

What is unusual is that Kirishima has taken to curving his large hands around Bakugou's stomach, his eyes unable to look away as he fucks his way inside Bakugou's willing body. He's a bit confused why Kirishima has become extra invested in his nipples, why he keeps calling them "tits", or why he sucks at them as if hoping milk will come out.

It's also pretty fucking weird that Kirishima has become insatiable these past few weeks.

Kirishima has always had a higher sex drive than Bakugou. It's worked for them so far. If Bakugou isn't up to it, Kirishima is more than fine with his hand.

But lately, Kirishima has become really, really insistent, grinding against Bakugou's ass or surprising him in the shower to finger him open. Bakugou has sat on Kirishima's knot more times than he can count, has milked Kirishima for all he's worth as the dog hybrid pinches his nipples and leaves bite marks on his shoulder.

In essence, Kirishima has become a bit sex-crazy and Bakugou just wants to know why. It can't be because it's mating season. Kirishima has never acted like this before. Something had to have set him off and Bakugou is going to get to the bottom of it.

By this point, Bakugou is ready when Kirishima comes sniffing around, his big bulky frame covering Bakugou's as he starts kissing at his neck, hand already gripping his hips.

Bakugou allows him for a few seconds, before turning his head, dislodging Kirishima's lips.

Kirishima whines, low in his throat, but Bakugou ignores him. "You can have what you want when you explain what's got you so riled up."

Kirishima huffs, giving him a squeeze. "Not this again. There isn't anything wrong."

Bakugou hums, before dislodging himself. His hips sway as he leaves the room, tail curling invitingly, and he throws a look over his shoulder. "Then I guess you'll just have to do without."

Kirishima watches him leave.

Kirishima tries two more times, only to be brushed off. Bakugou wakes up later that night to Kirishima panting in his ear and grinding against his ass.

Kirishima goes to sleep on the couch.

Honestly, Bakugou thought that it would just take two days before Kirishima gave in. The horny idiot could never hold out whenever they play this game, often too impatient to get to the good stuff.

So he's a bit surprised when, a week later, and Kirishima is still tight-lipped.

He's even more surprised when Kirishima begins to ramp up his deviant behavior.

They're on patrol, just finishing up their rounds on the 4th district when a call comes over the radio. They pause, listening to a description of suspicious activity before being told to stay put as the situation unfolds.

Bakugou had just started to grunt his agreement when he cuts off into a groan.

"I know you hate not being in on the action, Ground Zero, but this is the best plan," Ingenium says over the radio.

Bakugou can't tell him to shut up because he's too busy holding back moans.

"Yeah, Katsuki," Kirishima says, a smirk curling along his lips. "Just be a good boy and stay still."

Bakugou turns to glare at him, ears flat against his hair, face flushed. But before he can get anything out, Kirishima moves his hand again, stroking from the base of Bakugou's tail up to the tip.

Bakugou can't stop the sound that is ripped from his throat.

Kirishima's eyes dilate and then he's pushing Bakugou against the wall. He crowds in close, fingers still playing with Bakugou's tail. He leans in to whisper in Bakugou's twitching ear.

"Fuck, your mouth. It's so pretty, whether moaning for me or wrapped around my dick."

Eijirou," Bakugou stutters out, heat curling in his stomach. There was no way in hell he could stop the way his hips grind back against Kirishima.

"That's it, baby," Kirishima whispers. "Who's my pretty kitty?"

Bakugou closes his eyes and shivers. His head feels fuzzy, the sudden heat and want and the damn way Kirishima is playing with his tail makes it hard to think straight.

Kirishima leans down and nibbles on his ear, sharp teeth scraping against the soft skin, and Bakugou is gone. All thoughts of punishing Kirishima till he fesses up disappears, he just needs the mutt now and-

"Ground Zero, Red Riot, the situation has escalated. We need you."

The two jerk apart. They stare at each other, breathing hard.

Bakugou grits his teeth.

Kirishima raises his hand. "Katsuki, wait-"

He gets a face full of explosion, barely hardening in time.

"Die," Bakugou screams, face completely red and fur standing on end.

"I'm sorry!"

"Oh, you're about to be."

"Ground Zero and Red Riot, we need you! Do you copy?"

Bakugou bares his fangs, before pressing his comm. "We hear you, Four Eyes-"

"Ingenium!"

"Whatever. We're on our way."

Making sure his comm is off, Bakugou points at Kirishima. "You stay the fuck away from me."

Kirishima pouts, bringing out his literal puppy eyes. "Babe, please-"

"When we're done with this villian, I'm going to throw you through a goddamn wall." And then Bakugou points his hands down, blasting off into the sky.

The villain ends up being quickly brought down and slightly burnt thanks to an angry Ground Zero.

Bakugou is steadily ignoring Kirishima, resting up at the agency after their fight, but he does hear the way Kaminari comes up to the red giant and slaps his shoulder, no sense of self-preservation in sight.

"So, I see that you landed yourself in the dog house again, huh?"

Kirishima sighs. "Come on, man. I don't need this today."

"What? Have you been collared? Bakugou got you on a leash?"

"Kaminari, not cool, I don't make mouse puns about you."

"Um, because there are no mouse puns that aren't cool," Kaminari says. "So what has King Explosion Murder neutering you this time?"

Kirishima growls and even from where Bakugou is standing, he shivers at the threat there. "Make one more pun, I dare you."

Kaminari is silent for a minute. And then…

"You were being a horndog, weren't yo-"

Kaminari cries out as he is knocked to the ground, Kirishima standing over him with a hardened fist.

Bakugou hides a snort in his fist.

Bakugou's anger is at a shimmer the next day when Kirishima, the bastard, tries again.

They don't have any hero work for that day, just some paperwork they need to fill out about the incident they were involved in, and then they get the rest of the day off.

They decide to head to the gym afterward, splitting up for a bit as they get their individual workouts in.

Bakugou always finishes his up early, hitting the showers, before going out to spot for his boyfriend.

The cat hybrid would rather die than admit that this is actually his favorite part of their shared workouts. To be able to stare at his boyfriend unabashedly, watch those muscles bulge and work, watch his broad shoulders strain under the weights, watch as sweat glides down his body.

He might have initiated a sex ban, but that doesn't mean he can't appreciate the view.

Kirishima has moved on to the big weights, curling them as he counts, the sweat along his body letting Bakugou know that he's been there a while. He nods at Bakugou to show that he sees him before going back to lifting.

Bakugou stands a few feet away, next to the benches where he knows Kirishima will head next. He takes a long drink of water, eyes drifting up and down Kirishimia’s body and can’t help but smirk when Kirishima squats to drop the weights.

Then his eyes drift up to meet Kirishima’s in the mirror.

Kirishima’s eyes are dark and Bakugou finds himself caught in them. Kirishima licks his lips, drawing Bakugou’s eyes, before he stands back up, slowly. Bakugou gulps, but it’s too late to take back his mistake.

Kirishima has him caught, like prey.

Kirishima makes his way towards the bench, putting on his preferred weights, before beckoning Bakugou over. “You’re going to help me, aren’t you?” His voice has the start of rough edge and Bakugou holds in his shiver.

“Sure. Think you can actually beat that weak record of yours?”

Kirishima gives him a sharp smirk. “Of course.”

Then he starts to get to work. His arms are impressive as they bend and stretch, the heavyweights going up and down as if they were nothing. Bakugou’s eyes can’t help drifting to them or to the way Kirishima’s shirt scrunches up, showing off that toned stomach, and Bakugou watches for a brief second as it contracts and expands.

Kirishima clears his throat and Bakugou’s eyes jerk up to his. “You have a job to do, Katsuki. Don’t go slacking now.”

Bakugou tenses, tail twitching in agitation. “And you should be lifting. Whose slacking now?”

Kirishima grins, but continues his work out. Bakugou huffs, but focuses more on spotting. Wouldn’t want the idiot to hurt himself.

Kirishima finishes up and heads for the showers, Bakugou waiting just outside the locker room for him on his phone.

He is not at all prepared for when a hand grabs the back of his shirt and pulls him into the locker room. He twists his body around, hands sparking as they come into contact with someone.

Someone with hardened arms.

Bakugou barely has time to blink, eyes landing on red hair, before he’s being lifted up and slammed into the wall. Bakugou’s teeth clink together, but that doesn’t stop him from reaching out to grab at Kirishima’s throat.

They stop for a second, breathing hard, red eyes meeting red. Then their lips are clashing together, teeth biting at lips. Bakugou’s hands tangle in Kirishima’s hair, pulling hard. Kirishima’s hands are under his ass, squeezing, before pulling at Bakugou’s legs, helping them to wrap around his waist. Kirishima grinds down at him and Bakugou fucking groans.

“Shit, Katsuki, do you know what it does to me to see you drooling over my muscles?” Kirishima growls. “How hard it gets me that you love the fact that I could manhandle you into any position I want? I could slam you against these lockers, fuck you into your slutty body, and there’s nothing you can do about it.”

They both know that’s not completely true, that Bakugou would find a way to break free if he really wanted to, but right now, all Bakugou does is moan, yanking harder at Kirishima’s hair, lost to the images Kirishima paints.

Kirishima squeezes his ass, kneading the flesh there. “My second favorite part of your body, right behind your sweet tits. I especially love when it’s bouncing on my knot.”

Bakugou whimpers. He uses Kirishima’s hair to guide his mouth up into another kiss, no less desperate or hot. He tilts his head, drawing Kirishima deeper into the kiss, before pulling back to whisper against Kirishima’s lips. “I love your knot, love when it’s plugging me up, all your cum stuffed deep inside of me-”

Kirishima groans, eyes fluttering.

“You know what I love even more?” Bakugou asks.

“What?” Kirishima responds, body leaning even closer against Bakugou, eyes drifting down to Bakugou’s throat and chest.

“If you would just tell me what has gotten into you.”

Kirishima stiffens, before slowly looking up to meet Bakugou's eyes. Bakugou raises an eyebrow. Kirishima sighs. “I’m not getting any today am I?”

Bakugou raises his palm, his hand glowing. “Nope,” he says, popping the p.

After about another week and a half of this, Bakugou is done waiting. If the usual game isn’t going to get the job done, then he’s going to have to force Kirishima to tell him.

He is going to fucking break Eijirou if it kills him.

Bakugou stretches out, humming to himself. He has two meetings he needs to go to later today, but he rarely has this time to just sit back and relax.

Of course, relaxing for him means he’s still doing something. That something being yoga out in the living room.

He slowly moves his body from position to position, enjoying the slight burn. His ears perk up at the sound of the door opening, but besides that, he ignores his boyfriend, instead focusing on shifting his legs into the next position.

“Hey, babe, I brought lunch home,” Kirishima calls from the front door, where Bakugou knows he’s taking off his shoes before moving deeper into the house. “I thought we could eat together before you have to go- ach .”

Bakugou hides his smirk, shoulders shifting as he stands up. “Hey mutt, what’d you get?” He looks over his shoulder, showing his teeth at the sight of Kirishima standing frozen in the living room doorway, bags of food dangling in his hands.

Kirishima audibly swallows. “Uh, what are you doing?”

Bakugou snorts, turning away and moving to the next position. “What does it fucking look like? Yoga.”

“Yeah, but, um-”

“What? Does the cat have your tongue?”

“You’re naked,” Kirishima moans.

Bakugou looks down, as if this is his first time noticing his lack of clothes. “Huh. So I am.”

“ Why? ”

Bakugou shrugs. “Why not?” He bends down, his forehead touching his knees. He can practically feel the burn of Kirishima’s stare on his ass. “The sun is shining pretty bright today and you know how much I love to spread myself along the window sills to soak it up.”

His voice is practically a purr and he knows exactly what he’s doing, reminding the mutt of what happened the last time he was spread in front of the window, when Kirishima had been curled up behind him, both slowly rocking as the sun had warmed their skin.

Bakugou curls his tail, beckoning Kirishima’s eyes to follow along as he works his way through his routine. He can hear the other huff and panting, the mutt probably drooling.

“You’re torturing me here, Kat,” Kirishima says, sounding strangled.

“You know what you have to do if you want a piece of this,” Bakugou says. His hands, which had been wrapped around his ankle, slowly start to slide up his leg, gliding along the smooth skin.

“There’s nothing to-”

Bakugou shrugs, before turning around, coming face to face with Kirishima. He stalks his way forward, eyes half-lidded.

Kirishima might be holding his breath. Bakugou is pretty sure he’s not breathing.

And then Bakugou passes by him, brushing his shoulder, before heading up to their room. “Then I guess we’re done here. Let’s have lunch.”

The sound of Kirishima hitting his head on the wall echoes around the house.

Bakugou doesn’t do this often-

Ok, that’s a lie. He does do this quite often, but always in the privacy of their home. Rarely does he do it in public.

But by this point, he’s willing to pull out all the stops.

They’re back on patrol, walking around the 5th and 6th district, with the hot sun beating down on them. Bakugou curses. His gauntlets are already half-filled by this point, and he hasn't even done anything.

Kirishima taps on his shoulder, pointing to a stand selling water. They go over to buy some, only to have the vendor wave off their attempts to pay, thanking them instead for the jobs they do.

They go to stand to the side, in the shade, drinking their free water. Side-eyeing Kirishima, Bakugou casually leans against the wall and then pulls on the strap of his hero suit, as if he were trying to fan himself.

Kirishima glances over.

Then he does a double-take.

“Katsuki, no,” he says, almost in horror.

Bakugou innocently blinks at him. “What? I’m just drinking.”

But Kirishima is too focused on his bared shoulder to respond.

Bakugou looks down. “Oh, you mean the bra strap, huh? Yeah, I don’t know why, but I felt like dressing up a little today.” His fingers play with the baby blue strap, snapping it against his skin.

“Did-Is it a complete set?” Kirishima asks, tail wagging behind him, ears perking up.

Bakugou smiles, wide and all teeth. “Wouldn’t you like to find out.”

“You-you’re a monster,” Kirishima says.

Bakugou chuckles, pushing off the building. He rubs his head against Kirishima’s shoulder before pulling him back on patrol. “I know.”

It continues like that for the rest of the day, with Bakugou giving Kirishima little hints and peeks of the lingerie he wears underneath.

Kirishima follows after him, like a mutt on a leash, and more than once, walks into a civilian or doorway. Bakugou sits back and laughs at the way he goes red and sputters out excuses.

When they reach the agency, they both head back to the locker rooms to get changed out of their costumes. Bakugou barely passes the threshold, before he’s being grabbed, flipped, and pressed face first against the wall.

He sends a smirk at Kirishima. “What’s with you and manhandling me in locker rooms lately?”

Kirishima growls, low in his throat. “As if you don’t deserve it. You’ve been winding me up all fucking week.”

Bakugou bares his fangs. “And you haven’t been doing the same? I told you, Eijirou, all you have to do is tell me what’s been on your mind and then you can do whatever you want to me.”

Kirishima growls again, pressing close. He noses his way through Bakugou’s hair, huffing. “...I’m afraid you’ll think I’m weird or something.”

Bakugou pauses, before turning his head to rub it against Kirishima’s. “Eijirou, you never have to be afraid to talk to me about stuff. You know that, right?”

Kirishima drops his head against Bakugou’s shoulder, large arms wrapping around his waist. “I know but it’s...thoughts getting to me. Will you think it’s too weird, will you look at me differently, that sort of stuff.”

Bakugou reaches back to start to play with his hair. “You know I love you. You could say the weirdest shit to me and, maybe I might say the wrong thing at first, but nothing could ever make me stop loving you or thinking you’re too much for me.”

Kirishima is silent for a moment, squeezing tighter and inhaling Bakugou’s scent. Bakugou continues to play with his hair, fingers brushing against his ears, scratching right behind them in that secret spot that makes Kirishima melt.

“...M’ wanna breed you,” Kirishima finally mumbles.

Bakugou furrows his eyebrows. He feels Kirishima tense behind him and is quick to scratch that spot again, forcing him to relax. “Not that I’m saying it’s bad, but you know I can’t get pregnant right?”

“I know,” Kirishima says, still muttering into his shoulder. “I just...you know that girl, Doi? That you were playing with at last month’s charity function?”

“Yeah?”

“I saw you being all sweet with her and it was like I was suddenly hit with the image of you doing that to our daughter. And then other thoughts kept rolling in my head. You, holding our child. You, feeding out child. You, round with our child. And that eventually devolved into-”

“You trying to stuff as much of your cum into me as possible?” Bakugou asks.

Kirishima’s breath hitches. He digs his claws into Bakugou’s waist. “ Yessss . It’s consumed my thoughts. At this point, I don’t really care that you can’t have children, it’s all about the trying you know? I just want you to constantly sit on my knot, warm my cock, be a tight hot little cocksleeve.”

Bakugou bites his bottom lips, face flushing. “Damn, Eijirou. And you’ve been keeping this to yourself all this time?”

Kirishima lifts his head, catching Bakugou’s eyes. “You...you like that?”

Bakugou sniffs, looking away. “I mean, you’re the one whose saying all these dirty things. Of course I’m going to find that hot.”

Kirishima grins, pressing a kiss against Bakugou’s shoulder. Then he goes to whisper directly in Bakugou’s ear. “Yeah? You like the thought of you all fucked out on our bed, spread out, your hole wet and sloppy as I force my knot back in?”

Bakugou moans, low and heated. “You going to put a liter in me, mutt? Huh, you think you can?”

Kirishima rumbles, the sound vibrating deep in his chest, and Bakugou doesn’t have time to react before Kirishima bits into his neck, leaving a large mark. Bakugou whimpers, grinding his hips back. Kirishima takes advantage of that, moving Bakugou’s waist back so he can grind on his ass.

“I know I can. Going to keep you stuffed, make your tits all fat with milk.” One of his hands reaches up to cup one of Bakugou’s pecs.

“With that weak knot of yours?” Bakugou grits out, trying hard not to fall apart as Kirishima gropes him. “Good fucking luck.”

“You challenging me?” Kirishima asks.

“What do you think?”

Their eyes meet, sparks flying between them, both of their mouths pulling back to show off their fangs.

The door opens and they jerk apart. An intern peeks their head in, whistling before coming to a halt. They stop and stare at Bakugou and Kirishima, both of their costumes wrinkled and messed up, their hair wild.

“Um,” they say.

“Get the fuck out,” Bakugou screams, hands sparking.

The intern eeps, scrambling back and out the door.

Kirishima sighs. “Bakugou-”

“Don’t you fucking start,” Bakugou snarls. He runs a hand through his hair, huffing, before catching Kirishima’s eyes again. “You want to take a half-day and get the fuck home?”

“Gods, yes.”

They burst through the bedroom door, wrapped around each other, Bakugou climbing Kirishima like a tree. They’re not really kissing, more like they’re trying to eat each other’s mouths.

Bakugou groans, pulling back. "Fuck, Eijirou." His claws dig into the skin on Kirishima's shoulder, making the other hiss.

Kirishima practically throws Bakugou down on the bed, red eyes blazing. He's quick to get himself undressed, tripping on his costume in his hurry to throw it on the ground.

Bakugou is right behind him, shimmering out of his pants, trying to peel himself out of his top too, when Kirishima grabs his ankles and yanks him down. Bakugou lets out a little sound of surprise as he slides along the bed.

Kirishima crawls over him, slow and predatory, eyes glued to the panties Bakugou is wearing. Bakugou tilts his head, spreading his legs and fingering the lacy edges. “Do you like what you see? Want to unwrap me like the present I am?”

Kirishima licks his lips, grinning. “Fuck yeah, babe. I want to see the entire picture.” He lifts one of Bakugou’s legs, kissing the side of his knee. He slowly kisses his way up Bakugou’s thigh, keeping eye contact, before biting into the meaty flesh. Bakugou’s breath catches and then Kirishima’s soothing the sting with a kiss.

He repeats the pattern a few more times, leaving marks along the way, before reaching the bulge in his panties. He spreads Bakugou’s legs wider, nuzzling the covered dick, before biting on the edge of the panties, pulling down just enough for the tip of Bakugou’s cock to slip out. Kirishima gives the tip a lick, cleaning up the precum there.

Bakugou can’t tear his eyes away, little moans being ripped from his throat. Kirishima gives him grin before backing off. “Let me open my pretty present.” His large hands wrap around Bakugou’s waist, lifting the tight fabric of his shirt up to reveal Bakugou’s abs, then even higher. Inch by inch, blue fabric is exposed for Kirishima to drink in. It’s lacy and sheer, doing nothing to hide the way Bakugou’s nipples stand erect and waiting.

Kirishima, because he can’t help himself, pinches one of the pink buds. Bakugou arches into the touch, silently begging for more. Kirishima manages to get the rest of the shirt off, also throwing it to the side, his hand never leaving Bakugou’s chest.

Bakugou throws an arm across his face, face flushed and eyes narrowed. Kirishima’s tail is wagging a mile a minute, dick hard and heavy. “Come on, you mutt, I thought you were going to breed me? Are you going to break your promise?”

That gets him another pinch, making him hiss. “So impatient, my pretty kitty. Let me enjoy the way you look before we get to the fun stuff.”

Bakugou snarls. “That’s funny coming from yo- ah fuck .”

Kirishima hums, still twisting Bakugou’s nipple before twisting it to the other side. “That’s a little better. Keep making those pretty noises for me and maybe I’ll give you what you want.”

“Fuck- ah -you,” Bakugou hisses. He withers against the bed as Kirishima continues to play with his body, his other hand reaching down to give Bakugou’s cock light little stokes.

“My perfect cat, you’re going to look so good, all-round with my liter.” Kirishima leans down to give Bakugou’s stomach a chaste kiss. Bakugou wiggles.

“Eijirou, come on.”

“Someone’s needy. I haven’t even fingered you open and you’re already begging for me,” Kirishima says.

Bakugou flushes. "We've haven't had sex for nearly two damn months."

"And whose fault is that?"

"Yours."

"Hmmm, is that so?" Kirishima asks, fingers dancing along Bakugou’s inner thighs as he slowly pulls Bakugou’s panties down his legs. “I wasn’t the one who started the sex ban.”

Bakugou sneers. “Really? Who was it that kept their dirty little fantasies to themselves- fuck .” Bakguou’s body jerks as Kirishima’s fingers tap against his hole, wet with lube.

Kirishima chuckles. “You’re always so loud, babe.” He slowly pushes one finger in, wiggling it.

“Maybe, uh, maybe you’re just too fucking quiet,” Bakugou says, fingers digging into the mattress.

“Now we both know that’s a lie.” Kirishima adds another finger, scissoring. He licks his lips. “You look so delicious, spread out on my fingers. I can’t wait till it’s my knot that you’re splitting on.”

Bakugou moans, thrusting his hips down. “God damn, you’re fingers are so fucking big, Eijirou. Come on, fuck me already.”

Kirishima clicks his tongue. “Patience, Katsuki. I want you open for me, so my knot can just slide right in." He adds another finger, croaking them, pressing against that special place, and smirks as Bakugou's eyes widen.

And then he mewls.

They both still, Bakugou slapping a hand over his mouth, face twisted in horror.

"Did you just-"

"No!" Bakugou instantly denies, face going cherry red.

Kirishima can feel Bakugou's hands heating up. He moves fast, grabbing those tiny wrists in his hardened hands and slamming them on the mattress, right above Bakugou's head.

"You did," Kirishima breathes. "Do it again."

"What- no. Fuck no." Bakugou tries to thrash, but Kirishima straddles his hips, hardening his skin to make it heavier.

Kirishima leans in close, till their noses are almost touching. "I'm going to make you make that sound again, Katsuki."

Bakugou shudders, but he refuses to back down. "Is that a challenge?"

Before he can blink, he's being flipped over, arms pulled behind his back, chest and face pressed into the mattress, ass raised up. Kirishima palms his ass, a light touch, before giving it an echoing smack. Bakugou gasps, going still.

"That's a promise," Kirishima whispers directly into his ear. He gives the fluffy appendage a bite, two fingers shoving their way back inside, searching for Bakugou's prostate.

He knows he finds it when Bakugou's body jerks, Bakugou moaning low and long. But it's not the sound Kirishima wants. So he continues to press his fingers against it, milking Bakugou.

Bakugou is squirming, but with Kirishima's large body covering his and those hardened hands keeping his wrists pinned, there's nowhere for Bakugou to go.

Every time he moves, it just forces his hips back down on those thick fingers. It makes his cock throb, precum dripping freely. He whines, throwing his head back. "Eijirou."

Kirishima kisses his sweaty forehead. "Come on, Katsuki. You know what I want."

Bakugou shakes his head, ears twitching, tail curling and unfurling around Kirishima's wrist. "N-No."

Kirishima tisks, squeezing a third finger in, jabbing it against his prostate. Bakugou's eyes widen, mouth falling open. He pants, hole twitching.

"My pretty kitty, won't you make your sweet noises for me?" Kirishima continues to whisper in his ear.

"It's embarrassing," Bakugou practically yowls, hiding his face in his arms.

"Not if it's with me," Kirishima says, stopping momentarily. He nuzzles Bakugou's hair. "You have nothing to be embarrassed about if it's just me here, right?"

Bakugou bites his bottom lip. Kirishima doesn't move, allowing Bakugou time to think.

Finally, Bakugou sighs. Then, almost too soft to hear, he mewls.

Kirishima's grin splits his face. He kisses Bakugou again and starts moving his fingers. "Good boy, that's so lovely, yes please keep making those noises." He spreads his fingers. "Louder, kitty cat, louder."

Bakugou is shuddering, body beyond hot, as Kirishima fucks him open. His sounds of pleasure increase in volume, Kirishima encouraging him along the way.

It doesn't take long at all before he's coming against the bed, Kirishima's fingers still moving. He pants, little shivers of aftershock rocking through him.

When he comes back to himself, it's to the feeling of Kirishima rubbing his cock against his ass. He lazily grinds back. "Getting ahead of yourself, aren't you?" He mumbles. "I thought you were going to breed me?"

Kirishima bites into his shoulder, making Bakugou hiss. "If you can talk again, then I guess that means you're ready to be fucked."

Bakugou lifts his hips up, moving his tail out of the way to show off his stretched hole. "Come on Eijirou, fuck a litter into me."

Kirishima growls, low and heated. His cock presses against Bakugou's hole, sheathing himself inside that hot, wet heat. Bakugou cries out, the sound almost lost in the howl Kirishima let's out.

Kirishima wastes no time as he starts to thrust, hard and fast into Bakugou, hips slapping against his ass.

Bakugou whines, his moans being punched out of him with each thrust. Kirishima let's go of his wrists, his hand trailing down Bakugou's body to curl around his stomach.

"Can't wait to see you all fat with my seed. I'm going to make you sit on my knot all through your pregnancy."

"I want it, please Eijirou, please. Knot me, knot me."

"You're going to get your knot, patience." Kirishima brings Bakugou's hips up higher, so he can fuck into him deeper, his cock now slamming against Bakugou's prostate.

Bakugou is back to mewling, his cock growing hard again. He tears up the sheets, thrusting back against Kirishima. He can feel that fat knot bumping up against him, desperately trying to slip inside.

With every slam, Kirishima's knot spreads Bakugou open just a bit further, goes in just a bit deeper. Bakugou mewls and yowls through it, begging Kirishima with every other breath. His cock is fully hard by now, almost painfully so.

With one last, hard thrust, Kirishima pushes his knot fully in, locking them together. He snarls, biting into Bakugou's shoulder, hard enough to draw blood. One hand moves from his grip on Bakugou's waist to his cock, stroking him rough and fast.

Bakugou's eyes roll into his head, body going stiff. His orgasm is ripped out of him, joining his other release on the bed. He can feel warmth rushing into him as Kirishima cums, still slightly rolling his hips as Bakugou's hole milks him.

They stay like that for a minute or two, and then they collapse into the bed, boneless.

Kirishima turns them to the side, wiggling till they were in a more comfortable position as they wait for Kirishima's knot to deflate. Kirishima continues to pet and stroke Bakugou, singing him praises.

Bakugou shifts back slightly, settling into Kirishima's chest, hands drifting down to rest on his stomach. "So," he says after a moment. "Should we start looking at adoption agencies?"

Kirishima chokes.

#kiribaku #katsuki bakugou #eijirou kirishima #smuttish #hybrid au

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