Thread by @M4nEat3r

Kirishima should have known, to be honest.

He's 13 years old now, so he should be smarter than this.

Should recognize the gleam in his owner's eyes as he orders him drink after drink after drink.

#nsfw #puppyKiri #ProHeroBaku #omo #omorashi #pissplay #agegap #doggystyle

💫Coming Soon💫

But it's hard, okay?!

How is he supposed to know he's being tricked when his owner gives him that smile? That soft, secret smile that he saves only for Kirishima which never fails to send his tail wagging at supersonic speeds.

The same smile he's giving him now watching him chug another ridiculously full glass of water after only having a few bites of food at the special hybrid restaurant his owner had taken him to tonight.

"Is it good?" He asks the pup softly, his voice hushed and adoring.

Kirishima nods enthusiastically, his young, chubby face sticky with sauce. "Yeah! It's a really good steak! Not better than yours though."

Katsuki scoffs, finally settling back in his chair. "Of course, it's not better than mine, silly puppy. I'm the best at everything!"

He beams at his owner, bright and happy as he shoves the last piece of his steak in his mouth. "I know!"

"Fuck, you're cute," the blond responds with a sigh.

And even though his puppy's head ducks with embarrassment, his wagging tail says more than his words ever could.

"You done?"

Kirishima nods, shoving another bite of mashed potatoes between his lips before reaching out for his water again.

Katsuki gestures for the waiter while Kirishima guzzles the rest of his drink eagerly.

"We'll have the check, please."

"Yes, Mr. Ground Zero."

Katsuki immediately scowls sulkily, turning towards his puppy's childish giggle. "Is it really that obvious?"

"Um..."

Kirishima takes in the trench coat, face mask, and sunglasses, all wrapped around a six foot something muscled man with distinct blond explosion hair.

"Kinda."

❗❗Reminder to please retweet with comment instead of commenting directly on the thread. Not that I mind, I just like retweeted comments better.❗❗

The hero huffs softly, rolling his eyes as a blushing, tail wagging hybrid waitress walked up to them with a check.

"I'm gonna go pay for this and call the driver. Go wash your goddamn face. Messy dog."

"Okay!"

He hops out of his chair, ducking in between tables and around people until he reaches the back of the buildings where the bathrooms are.

He makes quick work of washing his face, tugging the dry brown paper towels from the roll to wet and scrub at his face.

He briefly contemplates going to the bathroom, but dismisses the idea almost as soon as he has it. If Katsuki is calling the driver, then that means they'll be home in more than enough time for him to use their apartment bathroom instead of the dirty, public toilet.

He arrives back at their table to the blond glaring viciously at his cell phone.

"Katsuki?"

"Mmm. You ready?"

"Yeah!"

"C'mon then. Get your coat. I'm just waiting for Iida to call me back."

"Okay!"

He slips into his jacket, zipping it up carefully with his claws.

He can't afford to tear up another jacket just because he's not being careful.

Well, he could. They could. But why not just take care of the belongings he has already?

Katsuki is already in his coat, so he's standing by the time Kirishima's done, furiously typing on his phone.

He's cursing quietly but violently by the time they make it outside.

"Katsuki?"

"Iida is stuck behind a traffic jam on the freeway. Some drunk idiot crashed into a flower shop," the man sighs heavily, slipping his cellphone back into his pocket. "Looks like we're walking."

"That's good!" The puppy exclaims.

"Hah? How is that good, idiot?"

"It means I get to spend more time with you," Kirishima answers with a beaming smile.

"Fucking gross," his owner murmurs. But Kirishima can tell he doesn't mean it by the crinkle of his eyes behind his mask.

"Luckily it's a short walk!" He muses, slipping his padded hand into his owner's own ridiculously smooth one.

Katsuki snorts, squeezing his hand gently. "Only a dog hybrid would think an almost forty minute walk is 'short'."

"What? I like walking!"

Katsuki chuckles, soft and amused. "Yeah, I know, Ei."

They spend about 15 minutes talking amongst themselves about everything and nothing before Kirishima starts to feel anything.

It doesn't feel like much at first. Just the slightest of pressures that he can easily ignore.

After another seven minutes, it becomes not so easy.

"You okay, Ei?" Katsuki asks warily as a crosswalk, watching his restless hybrid shift from foot to foot.

"Huh? Yeah! I'm great," the redhead replies, tossing him a big smile that seems strained at the corners.

"Okay..."

They continue walking.

Kirishima is trying his hardest to focus on anything but the increasing pressure of his bladder, but it's difficult to do so. It seems like all of those glasses of water he drank at dinner are trying to come out at once.

They're only blocks from the apartment when he has to stop, panting something awful as he presses his legs together.

"K-kat..."

Katsuki hums, herding him into a somewhat secluded alleyway. "You okay, puppy?"

"I-I gotta pee," he whispers quietly, squeezing at Katsuki's hand.

"Oh?"

The blond's voice isn't shocked. In fact, it's amused, and deepened with excitement.

His head snaps up, wide and betrayed eyes clashing with unapologetically mirthful ones.

"You!"

"Me," he purrs, and suddenly Kirishima is being pressed gently up against the alley wall.

He gasps, his ears flattening against his head as his owner's body slides against his like the perfect puzzle piece, allowing him to immediately feel the hard line of a swollen cock pressed against his belly.

"Ah!"

"You're so innocent," Katsuki coos at him softly.

Large hands sliding down his back until they're gripping one of his perky ass cheeks in either large palm.

"You never even questioned why I kept ordering you water. You just drank it. Such an obedient little puppy."

Kirishima moans shakily, his claws scratching against brick.

"I-I was thirsty," he protests weakly.

Katsuki snorts, long fingers slipping down between his crack to press against his clothed hole firmly.

"Liar. You knew what I was doing, didn't you?"

He shakes his head quickly, his body seizing as he's toyed with.

"I didn't! I didn't!"

(So ain't NOBODY gone qrt? It's my whole name and y'all just gone ignore it for some piss? Leah-phobic.)

Another soft, condescending chuckle fills the air, and Kirishima whimpers. He was hard as soon as Katsuki put his hands on him, and that combined with the still /very/ insistent need to piss is making him dizzy.

"I-I didn't, I swear! I was t-thirsty!"

"Of course, you were, puppy," Katsuki coos, kissing the top of his head as he presses a little harder against his hole, sending his knees knocking together.

"K-katsuki!"

A sudden kiss swallows his cry, rough and powerful in a way that makes his toes curl in his shoes.

The blond is dipping his tongue into his mouth in a way that he knows drives Kirishima crazy, little gasps and moans filling the air around them as his hands wander.

The sudden beeping of a horn just out of sight snaps them both back to reality.

"Fuck," Katsuki snarls savagely.

He grinds up against his puppy one last time, a slow, steady roll of his hips that makes Kirishima whimper needily, before taking his hands away.

They're both panting, and Kirishima is rock hard and desperate in two /vastly/ different ways.

"Let's go," his owner grunts.

Kirishima shakily tugs his jacket down, thanking God Bakugou insisted he wear one of the longer ones today (scheming ass) that reached down to his thighs, and then they're off again, slowly ambling through the evening streets.

He's a mess by the time he spots their apartment.

He can barely walk a straight line, and every other step he takes, he has to stop and squeeze his knees together, praying frantically for the hot load of liquid to stay in its proper place until he can get to the bathroom.

And Katsuki is /not/ helping.

To the untrained eye, he looks properly concerned, gently rebutting concerned people on the sidewalk with excuses like 'upset stomach' and 'food poisoning'.

But his hands are trained to be sneaky. Long fingers pressing against his nipples as he pretends to hold him up.

Hands roughly but quickly groping his backside while he's turned away, causing him to almost collapse in the streets. Filthy words whispered for only him to hear as his cock throbs with need.

But the worst experience happens just as he reaches the apartment doors.

"Kiri-Puppy!"

He groans quietly to himself, quickly pasting a strained smile on his face as one of the apartment's children run up to him.

It's Eri, her smile bright and happy, with Aizawa trailing not far behind.

"H-hi, Eri!"

"I missed you!" She exclaims, opening her arms for a hug.

He gives her the quickest hug that he's ever given anyone in his life.

"I missed you too, Eri, but I-!"

"Now, Ei, don't be rude," Katsuki's rumbling voice speaks up from behind them, causing goosebumps to break out across his arms. "You can give her a better hug than that."

He looks over his shoulder pleadingly, his tail curling with stress. "But-!"

"No buts," Katsuki responds firmly, his arms crossed with defiance. "Give her a proper hug."

He groans silently, looking down into sparkling red eyes. "O-okay..."

"Yay!"

He reaches down, lifting the already giggling little girl into the air for a hug.

She thankfully can only squeeze her little arms around his neck, and he's just barely able to keep himself from crushing her to his body, and in addition, his bladder.

It actually isn't that bad.

"Good boy," Katsuki says proudly as he deposits the small girl into her guardian's arms.

"Thank you for the hug, Kiri-Puppy!" She yells as Aizawa begins to wander down the street. "Come play soon!"

"I will," he calls back with a shaky wave of his hand.

Cool.

Nothing bad ha-

"Oh, by the way," Aizawa calls quietly, catching both Kirishima and Katsuki's attention. "The elevator is shut down. You're gonna have to take the stairs to your apartment."

Kirishima's stomach drops to his knees.

"T-the stairs?" He squeaks.

A large hand claps on his shoulder.

Katsuki's grin is small, but dangerous, his red eyes swirling with sudden eagerness.

"The stairs, huh? Looks like we're gonna be walking a little bit longer that we thought."

Kirishima wants to die.

"B-but we live on the sixth floor!" He sputters, his hands tangling nervously in the bottom of his jacket.

"Tough luck," is the blond's reply right before he pushes him through the doors, giving a quick nod to their doorman as they head for the door to the stairs.

Kirishima gasps at the quick pace, his bladder protesting loudly, threatening to burst.

"W-wait! Wait!" He gasps, clinging to the railing as he reaches down, squeezing desperately at his crotch.

It takes an inhumane amount of control to not just let himself go right there.

And then large hands are covering his own, massaging slowly as hot, excited breathing fills his ears.

"You have no idea how fucking hot you are like this," Katsuki whispers roughly, his erection thick and hard against his back. "All flushed and desperate. Fuck, puppy..."

He shudders, whining desperately as his knees shake.

"K-katsuki, I can't," he whispers desperately, tears gathering at the corners of his eyes. "I-I can't, I'm too full, please-!"

"Just one," Katsuki growls, interrupting his needy plea. "Just make it up one flight of stairs."

He groans, his voice echoing through the stairwell, but nods.

"Y-you promise?"

"Just one, I promise, Puppy, you're doing so good," he moans softly into his ear, watching closely as he takes the first shaky step with a soft whimper.

It's hard, opening and closing his legs.

The give of pressure threatening to be the last. But he's steady, taking wet, heaving breaths as Katsuki murmurs praise in his ear the entire time, steady hands on his hips guiding him upwards.

"Doing so good baby, so good for me, take your time, just like that, almost there..."

He almost collapses when he takes the final, shaky step, planting both of his feet on the landing.

"I-I did it," he breathes, gasping desperately. "I really did i-!"

He cuts himself off with a yelp as two strong arms scoop his smaller body into the air.

"Hang on," Katsuki growls, and then they're moving, his owner using his long, powerful legs to take two and sometimes three stairs at a time, all while being sure not to jostle him too much in his arms.

Not that it was helping much.

By the time they make it to the sixth floor, he's a gasping, crying mess, tears leaking steadily down his face from squeezed shut eyes as he digs his claws into the back of the blond's jacket, ruining it forever.

"We're here," Katsuki grunts, pulling his keys from his pocket.

He makes quick work of opening the door and gently settling the small hybrid down on his feet, who instantly lunges for the bathroom.

"Wait!"

A misplaced tug on his belt, digging directly into his stomach, has him collapsing in a curled ball onto the floor.

He can feel the barest trickle of liquid, beading at the tip of his dick, and he whines, long and animalistic as he fights it back.

"F-fuck...!"

"Language," Katsuki grunts, leaning down at his feet. "And next time, remember to take your damn shoes off."

Kirishima wants to hit him.

His owner doesn't stop at his shoes, however. As soon as those are off, he's reaching up, gently unbuttoning his jeans and yanking them down his legs, along with red paw print boxers.

"N-no, don't-!"

The cool air against his dick makes him whine.

"I'm just trying to help," Katsuki hums, his fingers tracing across the backs of his shaking thighs.

Kirishima mewls, his ears flat and trembling against his head as he squeezes himself into a ball, hand cupped tight around his dick, begging himself internally to /not/ pee.

"God, you're so hot," he hears his owner whisper, mixed with the sounds of clothes being shed and belt buckles being undone.

"D-demon," he whines back, sobbing as he feels soft wetness against his palm.

It's coming.

"Katsuki!"

He's scooped into tanned arms again.

The only difference now is that instead of rough clothes, he's pressed against bare skin, and underneath him, he can feel something hot and sticky poking against his spine.

"Hold it for just a little longer, Puppy," Katsuki growls, quickly walking them into their half bathroom.

It's a simple room with a toilet and a sink, barely big enough for two grown men to fit in. But it's perfect for one grown man and one shaky, almost delirious with need hybrid.

Kirishima literally weeps with relief when he spots the toilet, fat, wet tears sliding down his flushed cheeks.

He's almost there.

But of course, Katauki isn't going to make it that easy, if the two fingers suddenly massaging against his asshole are any indication.

"Ah!"

"Fucking cute was puppy," Katsuki hums into his ear, biting down on the furry appendage in a way that send heat boiling in his guts.

"K-Katsuki, noooo, I gotta pee," he whines, but he can already feel his dick jumping underneath his hand.

"Don't worry, we'll get there," the blond responds, his voice dark and wicked in his ears as the tip of his dry finger presses ever so gently inside of him.

Kirishima gasps, his hips jumping as sensation flares up inside of him.

"Ah!"

"My good puppy," his owner groans, grinding his own significantly larger dick against the back of his thigh, leaving a trail of sticky wet precum against his skin.

And Kirishima moans softly, because it's hot and its throbbing and he wants it even though he's already /so/ full.

"You were such a good boy for me, walking all the way home, and giving Eri hugs, and making it up those stairs," Katsuki groans, fumbling in the medicine cabinet for lube as he ruts harder against his puppy's thighs. "I'm so proud of you, baby."

And he preens, his tail wagging happily in their small, confined space as the dry fingers between his cheeks become sticky and wet with bottled slick before the whole tube is tossed away.

And then he's being filled, two fingers pushing up inside of him at a slow, unhurried pace.

It stings, but Kirishima looks at it as a blessing as his mind is further pulled from the distraction of his screaming bladder.

"You have no idea how close I was to taking you that alley," the blond pants, his movements suddenly jerky and frazzled, something wild in his eyes.

"I wanted to rip your pants down right there, you were so fucking needy, and it made me wanna destroy you."

"Please," he gasps, his back arching away from the sink he had been set on top of,no longer worried about his bladder, but his lust. "Please, Master!"

And Katsuki devours him right then and there, a deep, rumbling groan rising up from the deepest parts of his vocal cords to be swallowed eagerly by his puppy's tongue.

It's rare that Kirishima slips back into calling him Master like he did when Katsuki first got him.

That's how he knows the hybrid is really desperate, thrown back to his factory reset mindset, so to speak.

"Fuck yes, such a good pup," he groans against eager lips, a third finger slipping into his tight, clenching hole. "Gonna let fuck Master you full, baby?"

"Yes!"

He's quick and sloppy with prep, but he's also been hard for the entire walk home and a good portion of dinner, so excuse him if he's just as desperate as his hybrid. He yanks his fingers free, pulling at Kirishima's limbs until he's standing on shaky legs in front of the toilet.

"Please, please, please," Kirishima begs, his tail lifting up beautifully as he presents himself to his owner.

And how can Katsuki say no?

They both moan out loud when the head of his cock rubs against that puckered opening, already on the verge of sinking inside.

But its nothing compared to when it actually sinks inside, Kirishima going from a moan to a straight up wail that almost makes him come undone as his hips slowly push forward.

It's hot, hotter than ever before, and spasming in a way that he's never experienced.

"Oh fuck," he groans, collapsing forward to lean his upper body against the wall in front of them, easily drawfing Kirishima where he's splayed out on the back of their toilet.

"Move, please Master, move," the redhead gasps, and Katsuki can't do anything but comply.

(I can't draw, but here's like a quick idea of how they're fucking against the toilet right now lmao

Peep that quality peen action UwU)

He's pulling out before he's even all the way in, soft, pulsing walls wrapping around his cock as if his puppy never wants to let him go.

"God, you're gonna kill me, he groans, his forehead pressed against his arm so that he can watch the view below him.

And what an incredible view it was.

Kirishima, sprawled out against the back of the toilet, his face wet with tears as his eyes roll into the back of his head and sharp yelps forcing their way from his throat with every one of Katsuki's thrusts.

But he can't go slow and steady forever.

Shifting until his feet are both flat and steady against the floor, he places both palms against the wall in front of him, locks his legs, and lets loose everything he's been holding back.

Kirishima lets out a strangled scream as Katsuki's slow and steady thrusts become harsh and unforgiving, the rapid slap of skin against skin filling the room as he brutally fucks his hybrid into stupidity.

It's, fast, dirty, and animalistic in a way that it never was except for days like today. The rough pounding of hip. The harsh, panting breaths. The high pitched, dag like yelps that the blond was forcing from his hybrid's throat with each thrust.

The shriek of overstimulated need when Katsuki wraps a fist around the base of Kirishima's tail, still lifted out of the way of his rapid thrusts.

"Master!"

"Fuck, you look so fucking wrecked," Katsuki groans, yanking just the right amount of roughly at the sensitive appendage.

Sending spectacular tremors down his spine as he lifts his ass higher into the air, his hole clenching down tighter.

"M-master! Master!"

"Yesssss, such a good little puppy," he snarls back, hips going crazy. "Master's good little bitch."

Those four words, followed by a rough yank at his tail, sends his orgasm crashing into him like a train, no warning, no time to prepare.

It's there too quickly for him to even give warning for, blindsiding him with its power as thick, creamy cum bursts from the tip of his dick.

Splashing across the seat of the toilet as his body convulses violently. He can't even make a sound.

Or maybe he just can't hear himself screaming over the roar of his own blood rushing in his ears.

But Katsuki definitely can hear him.

"Fuck," he swears violently, watching with hungry, greedy eyes as his pup practically has a seizure against the porcelain he's draped across, cum spurting from his dick like some kind of sexy fountain.

He's clawing at the walls, deep, gauging marks that Katsuki'll be pissed about later, but right now only makes his dick that much harder as he gets proof of how insane his puppy is feeling being fucked right now.

But it's not over yet.

He wraps both of his arms around the small boy, arousal flaring hot in his gut as he feels his overwhelmed body trembling in his arms. It almost makes him feel bad for the firm hand he wraps around his penis.

Kirishima yells, loud and broken, feet sliding against the floor.

"Don't-!"

"Shhh, shhh, easy puppy," murmurs, pressing a kiss to his sweat dampened hair. "I'm helping, it's gonna be okay."

His puppy's body seizes violently when he uses his other hand to sharply press against his insides, right where his bladder is.

"FUCK!"

"Language," Katsuki admonishes as he begins to massage the slightly swollen area, his greedy eyes pinned to where his hand is holding the other's dick as he humps him from behind. "Remember, you had to pee? C'mon, I know you still gotta. Its okay now. Pee for me, okay, Puppy?"

Kirishima whimpers, his bleary eyes blinking through his tears. He can feel it again now that Katsuki is agitating it, full and bloated.

It only takes a few more presses of his owner's hand before he's releasing all he has with a deep, drawn out moan of relief.

Katsuki moans, watching with avid red eyes as his puppy pisses for him right then and there, held steady by his own hand.

He can literally /feel/ the liquid rushing out of his dick, hot and fast and way too much for his small body. He would feel bad if it wasn't so fucking hot.

It takes almost two full minutes before it starts to dwindle down, and another half a minute before it stops completely, finally empty.

Kirishima is almost dead after it's over, slumped against warmed porcelain as his knees threaten to give out beneath him.

But he can hear Katsuki behind him, still breathing shakily, his dick still hard inside of him.

And so, with a pained groan, he lifts his tail once more.

"Fuck, thank you, thank you Puppy, you're so good for me," Katsuki reverently whispers, squeezing him tight in his arms.

His hips thrusting erratically and unevenly for all of ten seconds before his exploding inside of him with a rough growl, his hips twitching forward with each pulse of heat inside his hybrid's little hole, until he's given all he can give and it's leaking down Kirishima's thighs.

They stand there for a while, just breathing together, their minds slowly coming back online after being shut down for so long.

"Wow," is the first thing Kirishima whispers, his voice raw and fucked up from screaming.

"Yeah," Katsuki replies, his own voice no better.

It smells like sweat and piss, and they're both covered in a variety of fluids that do nothing to make it better.

"We should clean up," he murmurs, kissing a red ear.

Kirishima hums, hissing as Katsuki pulls out and away, sending cum splashing onto the floor.

They very slowly amble to the main bathroom, Kirishima cuddled up in Katsuki's arms.

He's dozing by the time the blond is finished washing their stink down the drain, and completely passed out by the time they're laid up in bed.

Katsuki groans as he settles against the mattress, his muscles protesting loudly against the pained pull of his body. But he wouldn't change a goddamn thing about how today went.

The lie about Iida being in traffic even though it was it day off was planned.

But /man/, that elevator surprise was a bit of bonus content that he had not been expecting.

He yawns, loud and tired as he pulls his sleeping hybrid into his arms.

Everything else can wait. The clothes scattered on the floor. The scratches on the wall.

The cum, splattered all over the back of his toilet and the floor. He didn't care about any of it.

All he cared about was Kirishima, snuggled clean and warm in his arms.

He pressed a sleepy kiss to his forehead as he goes under, a small grin on his lips.

"Good puppy..."

✨~THE END~✨

I CAN'T BELIEVE I ACTUALLY FINISHED THIS IN ONE WHOLE DAY ALMOST. IM SO PROUD OF MYSELF!!

Thank you for reading! If you liked this, be sure to check out my other work, and if you just wanna be nice, feel free to drop some love to my Kofi account!

ko-fi.com/maneatingmomma

AND THANK YOU FOR ALL OF YOUR SUPPORT AND QRT'S THEY KEPT ME GOING AND I APPRECIATE AND LOVE Y'ALL SO MUCH FOR THAT AAAAA

@threadreaderapp unroll please!