Chapter Text
Eijiro could remember the night he met Mitsuki. He had been patrolling the streets downtown on the lookout for any mischief. It always had a way of finding the red themed hero and tonight was no different. A scream erupted from one of the many alleyways on this end of the city and Kirishima was on the move, he remained soft and fleshy as he ran, only hardening when he was met with a random hooligan holding up the most breathtakingly beautiful blonde he’d ever laid eyes on.
Red eyes met an even deeper pair of crimson and Mitsuki knew immediately; she was safe. Thank God! She let out a final battle cry, kicking with all her might and pulling her purse out of the goons grasp before running to stand behind the hardened hero. She damn near took care of the whole thing herself! The goon grasped his marbles before doubling over with a deep groan of pain.
It was merely a matter of keeping an eye on the culprit as police made their way to the scene of the crime, the perfect excuse to make idle chitchat.
Kirishima was thirty four years old and extremely happy to still be so popular amongst Japan. He was a motivational speaker, spending off days coaching at various gyms also made a lot of men look up to him. He was tall, muscular beyond belief and charismatic so it made sense he had a sizable female audience as well. Men, women and children especially loved this man, a true symbol of pure goodness.
He didn’t need to mention any of that to catch Mitsuki’s interest.
A date here, a date there and soon Kirishima was dropping by with a bouquet every other day. Well, every day that her son was away with his father. She was upfront from the beginning, she had a bratty child, huge emphasis on bratty. He was a struggle day in and day out, hardly ever respecting his bedtime and putting up a fight against veggies any time they were present.
“I just don’t know where he gets it…” Her voice was soft for a moment but as soon as their waiter brought Kirishima the wrong change, it was kind of clear where it originated from. “Haah?! Do you think we’re stupid or blind?! Which is it? I’m clearly not blind so you must think I’m stupid!”
That was his Mitsuki alright. Her explosive sense of self pulled Kirishima by the heart and maybe a little by his genitals, which he would keep tucked away for a special night.
That meeting was 4 months ago.
-
Kirishima stared at himself in the dingy reflection of some silver plates that were being used as tacky hall decoration. He was a few feet to the left of Mitsuki’s apartment door, his hands running through his brightly dyed red hair nervously. He opted not to wear it up this time around, both to avoid drawing attention and to be a little more classy looking for his meeting.
Meeting… He was to meet her son after all this time. Kirishima almost forgot she had one after so long but he was happy to be reminded. Eijiro wasn’t afraid of any child, he got along well with them and they loved sitting on his shoulders, beating his rock hard chest and listening to his amazing hero stories. He was equipped with quite a few and smiled at himself in the ‘mirror’.
‘You got this..’ His mind was strong, his resolve sure, he did one final once over before sidestepping enough to be stationed right in front of her door. He lifted his fist to knock but before he could, he heard yelling already.
“I told you to set the table! Get off that damn tablet! I told your father not to send you over with that thing.” Mitsuki’s frustrated voice rang through and Kirishima wondered if they needed an extra moment or two.
“It’s your date, Dummy!” He heard a much smaller but more defiant voice respond and his eyes nearly bugged out. If he called his mom a 'dummy', he’d definitely be in for it.
“Don’t call me that, brat! I’m your mother and you will show me some respect!”
The banter went on a bit longer before it quieted down, he heard some cartoons playing through the wooden door and finally gathered the courage once again to knock, so he did.
The stark difference in demeanor should be studied in a lab, he wouldn’t have ever guessed that the sweet voice greeting him now was the same one he just heard through the door. No matter. Nothing the confident pro hero couldn’t handle.
“Oh, Eiji- you’re here!” She squealed, wrapping her arms around Kirishima’s neck and dangling happily, her legs swung around his waist and she peppered his face with hasty kisses. Kirishima chuckled, flashing the sharpest teeth you ever did see before smooching her right back and allowing herself to peel away. “I made some tonkatsu ramen, let me just set the table.” The last three words fell from her lips with a heavy venom and were accompanied by a quick glare in to the living room space.
Eijiro followed her eyes, finally catching sight of the famous little Bakugou Katsuki. The child was staring at both of them from over his shoulder but when Kirishima returned his gaze, he whipped his head away quickly, facing the tablet in his lap instead.
Kirishima could see the resemblance. The same colored hair styled in a similarly spiky pattern, only just a few inches shorter than Mitsuki’s with a less obvious fringe. He dug it, he loved spiky hair. He gave Mitsuki a nod and final peck before allowing her to take the flowers in his hands to the kitchen.
Alright.. Here we go.. Eijiro took a few steps towards Katsuki and knelt down next to him, observing his tablet screen. It was an old episode of Adventure Time, which seemed like it was more aimed at 14 year olds as far as Kirishima remembered. The kid didn’t look 14 at all. “Whatcha watchin?”
Katsuki ignored him, keeping his red eyes on the colorful monitor in his lap. He wore an oversized wifebeater and All Might themed pajama pants, cute. “You know, I’ve actually met All Might a few times. He’s pretty darn cool, huh?”
“It’s not impressive just because you’re a hero too…and your hair is stupid. Red Riot is a dumb name.” Katsuki spat before rudely turning his back on Kirishima.
Okay, well, that hurt. All the pro hero could do was laugh defeatedly as he stood straight up. 'Alright, maybe next time don’t kiss up on his mom before trying to introduce yourself.' Kids are always unpredictable and he decided he would just have to keep trying.
Dinner was ready and soon the three were sitting at the small dining room table Mitsuki had gotten second hand from a garage sale. How thrifty.
“So.. Katsuki, do you have any questions for Eijiro? Aren’t you excited to have a pro hero as your new dad?” Mitsuki questioned with hope and excitement in her voice but Katsuki merely sneered, stirring his noodles around with no intentions of eating them.
“I don’t need a dad.. Or a stupid mom…” He muttered bitterly. The boy didn’t know what he needed but he would refuse it all if it meant no more emotional pain. He just wanted his parents to be happy together again and Kirishima was getting in the way of it all. Some Hero.
Mitsuki sighed, frustration seeping through but before she could retort Eijiro rubbed her shoulder gently. He’s got this.
“Well how about we start as friends then?” Kirishima offered, holding a hand out for Bakugou. “I’d love to get to know you, Katsuki. You really seem like a cool kid.” His voice was tender, patient and Bakugou wasn’t used to it. The yelling always came first, the insults took front stage always. The boy peered up through messy bangs, eyeing Kirishima before clicking his tongue and taking a bite. That was better than flat out rejection…Progress.
Mitsuki observed as well with a deep facination, only interested in Katsuki's cooperation rather than his feelings and insults. They all enjoyed their meal gratefully albeit mostly silently.
-
Kirishima was serious when he said he was up for the challenge. Mitsuki was worth dealing with a little back-talk for the rest of his life and Katsuki wasn’t so bad. Not yet. Eijiro was determined to guide Katsuki onto the right path, to be a stable father figure and bring him up to be an upstanding citizen of society. Maybe even a hero if he works hard with his high potential quirk.
He had to start strong and what did kids love more than water parks? Nothing, that’s what! Kirishima had season passes to one of many All Might themed water parks, other heroes were involved as well but we all know which name brings in the most attraction. The most money.
Kirishima wore sunglasses, sunscreen laid flat across his nose and his arms were occupied with various bags and floaties. Mitsuki may have overdone it on supplies but the frugal woman refused to let Kirishima spend money on items she had at home already. Speaking of, the blonde mom dug through her bag in search of their passes and soon they were passing through the metal human counter.
“Alright.. Everyone go change and then meet back here. Don’t forget to shower before you get in the water.” Mitsuki pointed at Katsuki as she spoke before looking up at Kirishima with hopeful eyes. “I can trust you to help him?” Her voice was much softer towards Kirishima than Katsuki and the child clicked his tongue once again. Heroes and moms could be so annoying.
“Aye aye, madam!” Kirishima saluted dorkily before dipping down to kiss Mitsuki and soon he was gripping Katsuki’s much smaller hand. Kirishima was a large man, a tank of a man, standing at a whopping 6 foot 10 inches, he towered just about everyone that wasn’t another beefy hero. The child next to him was a mere four feet tall. Kirishima felt like such a dad right now, his heart swelling a bit at the idea of it all.
He never thought of having kids of his own but the prospect of being that figure for someone, being needed not only on the streets but domestically, Eijiro was excited to help future generations in more ways than one and he gave Katsuki’s hand a reassuring squeeze as they slid through the crowd to the locker rooms.
The eight year old kept his head down, emotions bordering onto straight up hate boiled within him. What a joke, this man thought he could just waltz into Katsuki’s life and wreck it- Fuck his mom and play papa like some fag. Katsuki grit his teeth as he and Kirishima finally entered the small building with showers and stalls. It was huge, 20 stalls lined on one wall mirrored by 20 more on the opposite wall which was a fair distance away, an island of sinks separating them.
“Alright, no line! Awesome, let’s go!” Kirishima was excited to get on those swirly slides, clearly more so than the kid he was here for. Kirishima moved to lock himself in a stall alone, assuming the Bakugou boy would simply occupy the next one over. The kid seemed self sufficient for the most part, clearly miles ahead of any 8 year old Kirishima had ever met, so the redhead was surprised when a little hand tugged on the stall, preventing it from shutting properly.
“Help me change.” The kid simply spoke, his eyes still hidden by his fringe.
Oh. Well. Okay, whatever. Kirishima flashed a smile once again, his job was to help after all. “Sure!” He stepped aside, letting Bakugou squeeze into the stall next to him.
Bakugou stared up at Pro Hero Shit Riot, his own rendition of the name, and waited expectantly, forcing him to do all the work and Kirishima did so without question. He started with the child’s Nighteye themed shirt, pulling it up and over the little blonde’s head. His chest was nothing like Mitsuki’s, clearly, it was flat and his nipples were smaller, pinker. They already stood erect but Kirishima didn’t question it, he wasn’t a weirdo. Next was the shoes, socks and pants. Those little feet were just too cute and Kirishima fought the urge to tickle them, that’d surely anger the child.
All that remained were a pair of boxer briefs that hugged Bakugou’s little booty snuggly. There was no pause cause that wasn’t what Kirishima was looking at, he was just being a friendly man. He pulled the boxer briefs down to reveal a semi hard kid dick. Must be getting to that age.
Eijiro stood. “Alright, my turn.” He would strip and they would shower and go swimming. That was the plan, that’s how it was supposed to go.
The pro hero stripped quickly, stuffing their dry clothes into one of the bags Mitsuki insisted on bringing and pulling their trunks out, hanging them off to the side where the hooks were located. “Ready?” He asked the much shorter boy with a playful smile as his hand rested on the faucet knob. The blonde glared at him through tufts of spiky hair before nodding just barely, silently.
What a gloomy fuckin kid bro.
“Alright!” Kirishima turned the water on and it started off cold which made him yell out for a second before he followed it up with a laugh. The child hadn’t flinched. “Let’s get rinsed off then..heh..” Even he was starting to get a little freaked out but regardless, he grabbed the cheap soap Mitsuki gave him and lathered himself quickly, just wanting to return to his lovely girlfriend already.
The difference in cock sizes was staggering. Bakugou stared at it angrily, the very thing wrecking his family from the inside out stared back at him like a serpent, brooding and evil. Bakugou wanted to slay it, to defeat it and be a true hero in the Bakugou family.
The skin on Kirishima’s cock was a shade or two darker than the rest of his body and it hung, swinging ever so lightly against either thigh as the adult man scrubbed himself diligently. There was nothing but sunshine and rainbows in Eijiro’s mind as he hummed a random tune, unaware of the evil building next to him but soon, he would know.
“Hm? What’s up bud?” Kirishima looked down, the boy had the two toned cock in his hands, observing it silently. Kirishima chalked it up to the difference in looks, the boy must just be curious. That’s all. He chuckled nervously. “Penises are weird, huh? Yours should grow some more soon, that’ll be exciting, right?” He tried to make light hearted conversation but he couldn’t help but notice the growing stiffness.
That would happen if anyone was holding your penis though, duh. Erections pop up all the time with no explanation. It meant nothing. Kirishima’s balls hung menacingly, they were ginormous and it only made Katsuki angrier for some reason. Those tiny little hands gripped a little tighter, causing Kirishima to hiss under his breath. “A-alright.. Lets-” Katsuki started stroking it, clearly new to the whole jerking cock thing. Did his father not sit and have a talk with him about this?! Was it Eijiro’s responsibility now? It can’t be helped, he guessed.
“Mmh- if you do that…that’s something only adults should be doing with each other.” His words were already low and breathless, his cheeks dusting over pink. It had been a very long while since he got some action if he was being completely honest. Mitsuki was definitely eager but Eiji was a patient, respectful man with a strict moral code for treating women like the queens they were. Katsuki hummed in acknowledgement but kept his hands moving, occasionally poking the tip with his pointer finger as he tried to simulate whatever it was that adults did with their genitals.
He didn’t know everything but he knew it would be wrong for Kirishima to let this happen.
“Hey, kiddo.. Let’s keep our-nng- hands to ourselves now-” Kirishima grunted under his breath, his own hands doing nothing to stop the pleasure ticking his growing cock. His sack tensed and relaxed every few seconds, cum churning beneath the thick, wrinkled skin. Kirishima’s eyes rolled back a bit, his mouth hanging ever so slightly agape as tender little hands played with him. Was it getting hot in here? He hoped Bakugou was at least learning something from this, that’s right, it’s just curiosity and what better way to learn than with the real thing? They were both men as well, it hardly counted as anything more than a simple sex ed lesson.
Ah but the way he was feeling wasn’t innocent at all and Katsuki grinned from beneath his fringe before popping his lips apart and smacking them around the tip. It was a struggle, he had to open his jaw up to get it in and it sat on his soft little tongue so pretty like.
Eijiro shivered harshly, his head bobbing around curtly before he relaxed it back, staring up at the ceiling as the softest lips he’s ever felt enveloped his head entirely. “Ouuugghhh-...woah, woah!” He cried, coming to his senses for just a moment before his balls were being fondled, the fondling was aimless, the child had no clue how to properly fondle and that only made Kirishima’s cock harder. It was the perfect amount of teasing that made him blank out once again, his hips swaying ever so slightly back and forth as he let the pleasure massage his dick.
His cock pulsed, leaking thick precum onto that hot red tongue, the mouth licked and sucked at his cock so greedily even if it wasn’t big enough to fit the whole thing. Kirishima felt the urge to make room, to stretch that tiny mouth out with his hard, leaking member. His penis felt so swollen, it would hurt to not have it sucked the way it was being sucked right now and he almost wanted to thank Bakugou if his eyes didn’t look so devious.
God, fuck, those eyes. So childlike yet so knowing, there was more going on behind them than anyone knew. They remained on Kirishima and the adult shrunk beneath them like a fading shadow, he couldn’t even look the kid in the eye as this was happening, he knew it was wrong, so fucking wrong.
The kid kept sucking though, teasing Eijiro’s hard cock with that tempting, slutty mouth of his. How was he not supposed to fuck it? Anyone would, surely, it felt so good Kirishima wanted to cry. Precum spurted in thicker and thicker strings every couple seconds, filling Bakugou’s little mouth multiple times in which the boy simply had to swallow to deal with. Salty and slimy, he bobbed his head back and forth, fucking the space just before his tight throat with Kirishima’s rock hard dick.
Warm wetness rubbed the pro hero’s member from all sides, pumping him closer and closer to completion, his cock swelling more and more as time went on, his balls ached so much, he needed to empty them soon and Bakugou’s eight year old mouth was begging to take it all, it was sucking the cum from his dick at this very moment, it would be wrong to deny such a slutty mouth what it clearly wanted. Kirishima was dick brained at this moment, a complete slave to his desires and this little slut boy. Who raised this kid?!
His member was hot to the touch, fully erect at this point from being orally molested by his step son. That little minx, he must have been born just to taunt Kirishima, that had to be it, little boys didn't just suck your dick like candy for no reason. He wondered if it was some kind of quirk effect or a mere dream but the way his cock buzzed was all too real and familiar.
Eijiro closed eyes as the satin tongue lapped at his leaking slit all kitten like, so small but so smooth that tongue was as it glided around sloppily, coating his member in 8 year old saliva. His cock was fucking throbbing, his balls stirred with a feeling he's felt many times before but for some reason it was so much stronger this time, his penis felt like it was cumming for the first time ever. His voice fell out of his mouth before he could stop them, his dick flexing harshly as cum began to force its way out of him. Relief. It felt like a stopped up hose was finally unkinked and the flow felt so sensually delectable rushing through his urethra that he just couldn't contain it.
“Oooouughh–fuuuuuck, I’m- It’s coming-take it, take it.. Yeahhh..” He groaned his words under his breath, the shower muffling most of their noises. His cock released, warmth and butterflies crawled up from his thighs, to his balls, to the base and finally exploded inside Bakugou’s mouth. It wasn’t big enough and once the kid's cheeks were stuffed with hot seed he pulled off, closing his eyes as the rest of the heavy load shot across his face and hair, coating most of it in a thick glaze of man milk.
The little boy swished it around his mouth, drinking a good bit of it before letting a sizeable amount leak from his slightly upturned lips, his eyes wide and unwavering. “Thank you Red Riot for my present.. Do all the other kids get it too?” He asked through a mouthful of Kirishima’s fluids.
Post nut clarity was crashing down on him hard, and soon Eijiro was having trouble breathing. What the fuck what the fuck what the fucking fuck?! He almost wanted to ask if the kid was in with the league of villains but found himself feeling too guilty. There was no way he could blame a child, could he? There was also no way that this was normal, childlike behavior, that Kirishima was a pedophile, he’s sure as shit that he’s not and yet a little boy made him cum from his cock stronger than ever before. The hero rubbed his face as he tried to gather his thoughts. Their time was running out and if he didn’t present a child with an unfucked face then he was going to be in deep shit. Deeper.
“I-I-” Bakugou shook his head knowingly.
“You’re my bitch from here on out. Now, wash me.” Katsuki declared, spreading his arms out on either side of him and when Kirishima hesitated, he peered over his shoulder with a sinister grin. “Chop chop, papa.”