The Nerd Next Door [NSFW]

Dedicated to Mira because she inspired the career choices

─────

"Come on baby, come here! Come get the treats!"

Katsuki looked up from his book, already more than ready to tell his new neighbour to shut the hell up, but before he could open his mouth he saw the tiniest kitten in the world crawling his way, sniffing at the cloth of his hammock.

"Oh no, come on Bunny, back you come!"

"Go home," Katsuki grumbled, staring the thing in its big blue eyes. "Daddy wants you."

The face that peeked up at him was split between black and white, right down the middle. It looked at him with such a sweet innocence, exploring this big new world it had so recently discovered, and Katsuki could hear the owner whining beyond the trees. There was no fence between the properties, just a section of trees and bushes maybe half a metre wide – it looked a lot nicer than a fence, in Katsuki's book, while offering the same amount of privacy. Unfortunately it was also apparently a one-way ticket for a kitten to escape.

"I've got her," he called, against his better judgement, as he scooped up the fluffy ball and climbed out of his hammock. "Come on, you little idiot, time to go home."

"Oh! Thank you so much!" the neighbour called back, his tone already full of relief. "I'm so sorry, it's her first time outside and she got away from me!"

"It's fine."

He set the kitten down in the bushes, giving it a little nudge, but even with the neighbour calling and cooing, it just turned around to look at him again.

"Not me, idiot. Go home. Go to Daddy."

"Come on, Bunny! Look, come get the birdy!"

Katsuki heard the familiar jingle of a cat toy on the other side, watching as the kitten – Bunny, apparently, what a dumb name – sat down to look, but made no move to chase it.

"Um, what was your name?" the neighbour called. "Sorry, I don't think we've met."

"Katsuki," he answered, cringing at himself for it, wondering if he should have just walked off and refused to engage. He'd been very careful to avoid the stupid neighbourhood of suburban families with their cats and kids thus far, and in a heartbeat he'd ruined it.

Well, okay, he played with the cats who constantly dropped by his house to visit, but only when no one was looking.

"I'm Izuku!" the voice called back. "And this is Bunny. In case you see her again, I mean."

"Go on, Bunny. Go home."

"I guess she really likes you," Izuku giggled. "Come on Bunny, you've had your fun with Kacchan, time to come home!"

"Kacchan?" Katsuki growled.

"Eep! S-Sorry, just- baby talk to the cat, you know? It slipped out!"

"Ugh. Whatever. Just come get her, I'll hold her."

"O-Oh! Okay! Um, number sixteen, right?"

"Yeah, next driveway over."

"I'll be right there!"

He picked the kitten up, cradling it in his arm and smiling despite himself when it began to purr at him. A little stone path led from his backyard to the driveway, and by the time he carried her around the house, he could already see a sweaty, panicked mess running toward them.

"Thank you so much!" he bleated, eyes full of tears that threatened to spill down his chubby, freckled cheeks. "I'm so sorry! It's our first time letting her outside and she just decided to run away from me!"

"Our?"

"Huh? Oh! Um, my housemate, but she's out at work! Bunny was just so desperate to explore, and she's already escaped out the window twice before, and then panicked because she couldn't get back inside, and I just thought it would be easy you know?"

Izuku's eyes darted to a little ceramic bowl of water on the front porch, and his face lit up as he looked back at Katsuki again.

"Do you have a cat too? Which one is yours? I see a lot of them around! Is it a boy or a girl? Oh, they're fixed, right? I would hate for some angry tomcat to hurt Bunny or get her pregnant! I mean, we're gonna get her fixed too, but she's too little at the moment, so-"

"Deku," Katsuki interrupted, watching Izuku's face flood bright red. "I don't have a cat."

"Oh. A dog? I hope he's friendly to cats! Or she, I mean-"

"I don't have any pets."

"O-Oh."

"The neighbour cats just come by sometimes," he grumbled, looking away from the shining green eyes. "They like to come chill in my yard."

"Oh! You have a yard? No wonder Bunny wanted to visit! I mean- I'm sorry about that, and all, but kittens don't exactly listen to-"

"It's fine. They, uh, they hang out with me. In the sun. While I read and stuff."

"That's so cute!" he gushed, squeaking again when Katsuki blushed. "Oh! I'm so sorry! I just-"

"It's fine," Katsuki repeated, still not meeting the man's eyes. "Um, do you- Do you wanna come have coffee?"

"In your yard?"

"Yeah. Bunny can sunbathe."

"Yeah! I mean, if it's not too much trouble!"

"It's fine."

He led the way back down the side of the house, realising too late that he still had the kitten in his arms, but he just set her down on the hammock in the sunniest corner of the garden, letting her stretch out with a cute little mew. Izuku cooed at her as he sat down, rubbing her warm belly, and Katsuki quickly turned away to hide his smile.

"Tea or coffee?" he called over his shoulder, kicking his shoes off at the sliding door. "Or something cold?"

"Anything is okay!"

"Stop doing this polite shit, what do you want?"

"Um s-something cold would be nice?" he squeaked. "But if it's a hassle, I don't mind an-"

"Cold it is," Katsuki cut him off. "Be right back."

Izuku smiled fondly as he cuddled with Bunny in the sun, admiring Katsuki's backyard. It was perfectly landscaped, he must have spent a ton of money to have it done just right, with gorgeous fluffy-looking bushes and little trees barely as tall as Izuku. On the far side there was even a little stone waterfall, trailing down into a shallow stream that wove through rocks, eventually disappearing into the trees.

"It's really pretty out here," Izuku explained, when Katsuki returned and found him staring. "It must have cost you a fortune."

"Not really," he shrugged. "Just took some time to put together."

"You must have found a really good landscaper."

"Haah? I did it myself, nerd."

"O-Oh! I'm so sorry! I didn't realise, I just... Never mind. Do you uh, do you like gardening?"

"I guess."

He led the way up another stone path, this one a little more natural than the concrete tiles beside the house, past the trees and bushes to a pretty wooden gazebo. Bunny followed him with a cute little chirp, and Izuku joined the procession with a smile of his own. Beneath the roof of the gazebo stood a wooden table with four matching chairs, resting on a patchwork stone base.

"My parents," he explained, when he caught Izuku counting the chairs in his mind. "But three looked stupid."

"Oh! I mean, I wasn't going to say- I didn't think-"

"I don't have guests over," Katsuki shrugged. "You live next door, you'd hear them if I did. That's what you were thinking, I know."

"Do you get lonely?"

"Not really. I have friends I can visit, but I'd rather sit out here and read or work."

"What do you do?"

Bunny hopped up to gazebo platform, clawing at one of the posts, but Katsuki just shook his head when Izuku tried to stop her.

"It's fine, they all do it," he explained, picking her up and holding her up to the edge of the roof. "They like to sunbathe up here too."

"How come you don't have one? A cat of your own?"

"Animals don't like me."

Izuku gave him a scathing look, but Katsuki didn't seem to notice.

"I write," he answered finally, still ignoring the expression on Izuku's face. "Articles, manuals, sometimes proofreading, that sort of stuff. I work from home."

"Oh! That explains a lot. You must be smart!"

Katsuki just shrugged again, and Izuku smiled. He'd never expected the explosive blond to be so modest, when he was listening to him yell into his phone or at couriers who screwed up his deliveries.

"Here," he offered, sliding a tray toward Izuku at the table. "Sit, have something."

The tray held four different kinds of juice, along with a couple of fizzy drinks, the glasses full of crushed ice just waiting to chill their drinks on the hot summer day. With a little smile to himself, Izuku accepted, pouring pineapple juice into his glass and taking a long sip. Katsuki chose some kind of sparkling grape bottle for himself, looking surprisingly relaxed as he leaned back in his chair, looking out at the trees.

"So how many cats are there?" Izuku asked timidly, waiting for Katsuki to scowl and get defensive again. "In the neighbourhood, I mean."

"Sixish."

"Ish?"

"Six that I've met. Seen, I mean."

Izuku cracked a little smile, enjoying the faint pink tint that washed over Katsuki's cheeks. He was a handsome guy, Izuku would have to be blind not to notice. Even with all the yelling, he was surprised there wasn't a pretty lady around the house.

"Do you know all their names?"

"I gave them names."

"So no, then," Izuku laughed. "What do you call them?"

"That's Tiger," he began, pointing into the bushes. "And the one in the tree is Dive Bomb."

Izuku's eyes widened when he realised there were actually cats where Katsuki pointed  –  a grey one lounging high in the tree tops, a fluffy ginger one chasing bugs in the bushes.

"The one next door – the other way I mean – is Prince Murderclaws."

"I don't think I want to meet him."

"Nah, he's a sweetie. The black and white one down the street is Chicken Nugget."

"Why?"

"Dunno, suited him. And the twins out the back are Bang and Boom."

"Noisy?"

"When they fight at three in the morning they are."

Izuku smiled, taking another sip from his drink, and Katsuki actually shot him a little smirk in return.

"I think I'm gonna call this new guy Standing Invitation," he offered, pointing at the roof where Bunny was still exploring.

"Huh?"

"Because she has one. To come over."

Izuku's face softened into a much more comfortable smile, and he nodded faintly.

"Thank you, I'm sure she'll be glad to hear it."

"You can too, if you want."

"I wouldn't want to impose."

Katsuki grumbled something inaudible, and Izuku's eyebrows knitted together.

"What was that?"

"Maybe I should call her Flirt," he repeated, flooding red. "You know, so I don't have to try."

It was Izuku's turn to blush this time, mouth opening and closing like a goldfish as he stared at Katsuki's surprisingly cute face.

"Dinner?" he squeaked. "I-I'll make a reservation somewhere?"

"Any day is fine. Just let me know when."

Katsuki quickly learned that it wasn't so easy to make a date with his stupidly cute new neighbour and his freakin' adorable new kitten. Bunny was allowed outside a little more, now that Izuku trusted her to go hang out in the garden and not run straight into a street, but her owner never seemed to show up with her. Maybe Katsuki had read the situation wrong, maybe Izuku wasn't interested and was avoiding him now. He lived with a girl, after all, they were probably dating or something.

Until the knock echoed on his shiny wooden door, and Katsuki yanked it open, ready to yell at some door-to-door salesman for interrupting his evening.

"H-Hi, Kacchan!" Izuku squeaked, waving awkwardly. "Are you free tonight?"

"Sure," Katsuki answered, before he could think twice. "Let me go change."

"Okay!"

"Um, come in, I guess."

He showed the squeaky fluster-fest into the living room, but when the emerald eyes found a black and white cat lazing on the sofa, he relaxed immediately.

"You must be Chicken Nugget!" he exclaimed, sitting down to pat the lazy sod who liked to moult all over Katsuki's cushions. "Aren't you a big boy!"

"I'll be back," Katsuki mumbled, smiling faintly to himself.

"Yeah!"

He disappeared upstairs to his bedroom, digging in the closet for a passably clean shirt. He'd gotten so used to just laying around in the same sweatpants and tank tops that got washed once a week or so, he honestly wasn't even sure he owned a shirt with buttons anymore, but he was gonna have to hope like hell that his mother had sneaked one in, seeing as the nerd was wearing a damn suit.

Ugly as the thing was, it was a suit all the same.

"Aha!"

He managed to produce a white shirt and a blazer from the back somewhere, thankfully unwrinkled and not too musty smelling, and changed in a hurry to get back downstairs.

Izuku was still cooing away as he rubbed Chicken Nugget's belly, giggling at the way he drooled and purred like an idiot, but he jumped up when he saw Katsuki in the doorway.

"W-Wow!" he yelped, burning crimson again already. "You look so handsome!"

"Thanks," Katsuki answered awkwardly, running a hand through his hair. "Um, should we go?"

"Yeah!"

An unfamiliar car was waiting out front, and despite the awkwardness it brought them both, Izuku held the passenger door open for him to climb inside. It was small, nothing ridiculously fancy, but clean and well-kept, probably fairly new. Katsuki was a little surprised to see it in general, let alone in such nice condition, considering he didn't own one at all.

"I'm sorry for the short notice!" Izuku began, when he turned the key to start it up. "I've been so busy at work the last few weeks, and I just out of the blue got told I could have the night off, so I didn't want to waste it! I called around a few places and managed to find one that could squeeze us in, so it seemed like fate, kinda? That's stupid, I know."

"I told you any night was fine," Katsuki shrugged. "You, um, have a busy job, then?"

"Yeah! I mean, not as bad as school was, and now I'm getting paid which is nice! But yeah, it can be really flat out at times."

"You, um... What is it you do, again?"

"Oh, um, I probably never said," Izuku smiled sheepishly, sneaking a glance at Katsuki's face while they were stopped at a red light. "I, um, work in a hospital?"

"What, like, as a janitor?" Katsuki snorted. "Why are you being coy about it? You expecting me to make fun of you for being a male nurse or something?"

"No, I, um... It kind of feels like bragging or something, to say I'm a doctor?"

Katsuki just stared at him in silence for a moment, watching as the light turned green and he resumed driving, still bright red in the face.

"A doctor," Katsuki reiterated. "And you called me smart?"

"Don't start!" Izuku whined. "I told you it sounds dumb to say it!"

"It doesn't. Jesus. Um, what kind of doctor? Just general... doctor stuff? Pediatrics or something probably, with your... personality."

"I'm a surgeon?"

"You're what?"

"Well I'm a resident," he huffed, "I only just finished school so it's not like I'm really a doctor yet, but-"

"But you cut people open and rearrange their insides and shit."

"Y-Yeah? I guess?"

"Holy shit, Deku."

"Don't staaaart," Izuku wailed. "It's not a big deal! I just really wanted to be a surgeon so I did it, it's really not a big deal!"

"You big nerd," Katsuki smirked, weirdly comforted by his distress. "And what, you share a house with someone for fun despite your big-ass doctor salary?"

"I have student loans!" he whined. "Also the pay isn't that good. And Uraraka might be moving out soon anyway, her boyfriend is planning to propose, not that she knows that yet, so they'll probably move in together when he does and he has a nicer place closer to work so it'll just be me and Bunny at home after that."

"You ramble a lot when you're flustered."

"I know, I'm sorry."

"I didn't say it was bad," Katsuki shrugged, turning to watch out the window as they passed through the edge of their little suburban neighborhood. "I'm not great at talking."

"That's okay! Just tell me if I'm talking too much."

"It's fine. I uh, I don't mind listening."

Izuku flashed him a bright smile, and Katsuki felt his cheeks burning again.

"I'm kinda anti-social," Katsuki explained awkwardly. "I'm terrible at... dating and stuff. Or friendships for that matter. I just... Thought you were cute."

"You think I'm cute?" Izuku squeaked.

"Yeah? Obviously?"

"I'm so plain, though! Not like you."

"Me?"

"Don't pretend you don't know you're hot!" Izuku pouted, flicking his indicator on and pulling into a small parking lot. "There's no way you don't know it."

"Me?" Katsuki asked again, smirking a little. "I don't know what you're talking about."

"Arrogance isn't cute, Kacchan," Izuku huffed. "I know you visit the gym every single day to get those arms."

"I haven't visited a gym in years."

"Liar."

"Not lying."

"I don't believe you for a moment."

"I have equipment in my garage," Katsuki chuckled. "Haven't been to a gym since I moved in."

"Cheater!"

"You're the one who said go," Katsuki shoved him lightly, before they climbed out of the car. "You can't blame me."

"So what, you just sit there pumping iron while you research your articles or something?"

"Please never say 'pumping iron' again."

"Rude!"

"I work out every day when I wake up," Katsuki shrugged, closing the door behind him and waiting while Izuku locked up. "Then shower, breakfast, work."

"Don't you get tired of being in your house?"

"Why do you think I spend so much time in my yard?"

"Well it's pretty and you must have spent a lot of money on it, so you probably want to get some use out of it."

"I meant working on it, idiot. Lets me do something with my hands other than type and pump iron."

"You're making fun of me again."

"Nooooo, never."

Katsuki's smirk faded when they reached the door of the restaurant, staring through at red velvet and ornate gold pillars, at waiters and hosts in fancy suits, and Izuku caught it immediately.

"Is this place okay?" he asked nervously. "I mean, if you want to go somewhere else-"

"It's fine."

"Are you sure?"

"Yeah."

"You know I'm paying, right?"

"Haah? No fuckin' way, nerd."

"You spent the whole drive here going on about my job, let me buy you dinner!"

"And you spent it complaining about student loans. I'm paying."

"I invited you!"

"I'm manlier."

"Mean!!"

Katsuki smirked, reaching out to ruffle Izuku's surprisingly soft curls.

"Fine, then I'm paying for the next one."

"Fine! Wait, next one?"

"You didn't think I was gonna let you get away without a second date, did you?"

"We haven't even had the first one yet!"

Katsuki shrugged, still smirking, and finally Izuku softened into a smile.

"Okay," he agreed. "You can pay for the second date."

"Good boy."

Katsuki straightened his shirt as they stepped inside, wondering if he should have unearthed a tie somewhere as he dug through the closet, but he was at least ninety percent certain that he didn't own one. He hadn't even worn one in high school when it was part of the uniform, let alone since, when it was optional.

"Don't you dare," Katsuki growled, when Izuku peeked over his shoulder as he pulled out a chair. "Put your ass in that chair before I put it there myself."

"Okay, okay!" Izuku conceded, sitting down and letting Katsuki get his own seat. "You're so stubborn."

"Damn right I am."

With a little smile, Izuku pushed a menu into Katsuki's hands, ignoring the wary look he got as Katsuki flipped it open.

"There's no prices," he pointed out with a growl.

"Does it matter?"

"I might order something stupidly overpriced."

"I don't care. Order something that sounds tasty, it doesn't matter if it's overpriced!"

"I hate you."

"You're the one who begged me for a second date."

"Haah?! I didn't b-" he cut himself off when he saw Izuku's grin, eyes shining like two stupid little stars. "What the hell ever, ugh."

"You're cute when you pout."

"Shut up, when did you get so damn confident?"

"When you started blushing."

"Shut up."

Despite his complaints, Katsuki couldn't help but enjoy this cheeky side of Izuku. The flustered new neighbour had been cute, sure, but the stupid banter and teasing was far more fun than just stutters and blushes like he'd been half-expecting.

"Chicken pasta," he said finally, setting his menu down. "Been a while since I had a good, creamy alfredo sauce."

"Oooh, that does sound nice," Izuku agreed, nodding as he scanned the menu. "With a white wine? Chardonnay maybe? Oh, do you drink?"

"Sure, why not."

"You don't have to!"

"It's fine. I don't often, but I don't actively avoid it."

"Okay, well, it's your choice! If you don't want to drink, just say so!"

"It's fine. Wine sounds good."

To Katsuki's frustration, Izuku kept the menu in his hands until the waiter returned, not giving Katsuki even a moment to try and snatch it away to look at the likely-extortionate prices.

"We'll take the chicken alfredo with a white wine the chef recommends, and the filet mignon with a nice red. Thank you so much!"

"Wonderful choice, Sir."

He stepped away with the menus before Katsuki ever got a chance to peek at the price listings, and Izuku looked ridiculously smug at his victory.

"Think you're so clever, don't you?"

"I don't know what you're talking about," Izuku smiled. "So, tell me about work."

"Oi, Deku!" Katsuki yelled, when he heard the car door slam closed. "Your dinner is getting cold!"

"My dinner?"

He leaned down to peek through the bushes, eyes widening when he saw Katsuki sitting at his little table, two plates of food waiting in front of him. He looked up expectantly, and Izuku softened a little, nodding as a smile stretched across his lips.

"Just let me change my clothes!"

"What, you don't want to spill all over your fancy white coat? What a baby."

"The coat stays at work, Kacchan, you know that! Let me take this dumb tie off."

"You could take it all off, if you want."

"Kacchan," Izuku scolded. "Neighbours!"

"Yeah, so are we, nerd," he snorted. "Hurry up. And don't forget to bring Lube!"

"Kacchan, stop calling her that!"

He vanished in a flurry of embarrassment, and Katsuki sat back feeling as smug as ever. It had taken a few sporadic dates for them to really find a rhythm, with Izuku's schedule, until finally Katsuki had seen him come home exhausted after a long day. For a guy who hated going out more than necessary, he'd taken a long time to figure that shit out.

"It's about time," he smirked, when Izuku let himself through the side gate with Bunny tucked under his arm. "There's my slippery girl!"

Sure enough, she slid out of his grip like she was made of butter, running straight to Katsuki's feet for cuddles. Izuku sighed at her, but left them to catch up all the same, sliding into his seat at the table.

"It smells good," he offered, when Katsuki looked up. "You cooked for me?"

"Figured we never get time to go out, and I like to cook anyway," he shrugged, pulling off two metal covers that kept the heat in their bowls. "So I made you some good food, and then we're gonna curl up on the couch and watch a dumb movie."

"Yeah?" Izuku smiled softly.

"Yeah, nerd. I'm a homebody anyway, dunno why we kept stressing about this 'going out' shit when we could sit in my comfy-ass living room with the cat."

"You're just dating me for my cat," Izuku pouted. "Aren't you, Kacchan? Tell me the truth!"

"Oh please, little Lube would pick me any day. I don't need you. Wouldn't you, baby girl?"

Bunny chirped at him happily, and Izuku sighed again, smiling all the same.

"It smells amazing."

"Then eat it, idiot."

Izuku dragged his bowl closer, taking until that very moment to catch on, jaw dropping when he saw the beautiful homemade katsudon in his warm bowl.

"You really do listen," Izuku stuttered, lower lip trembling. "Kacchan!"

"Eat up, nerd. You have rotations tomorrow, gotta get an early night."

"I love you."

"Three whole months, that's a new record."

"Shut up!" Izuku sniffed hard, tears sparkling on his eyelashes. "It's so hard to meet people and date and stuff with my schedule, I just thought I'd never find anyone, and then you walk into my life and you're just so damn perfect! It's not fair!"

Katsuki just watched as the tears sneaked their way down his cheeks, watching him scrub uselessly at his eyes as he blubbered, the heels of his hands not nearly absorbent enough to handle the mess. Even as he sobbed, he still stuffed food in his mouth, and the whole messy picture was ridiculously endearing.

"Move in with me."

"Huh?" Izuku nearly choked on his food, swallowing hard to keep the humiliation at bay. "W-What are you talking about?"

"When Round-Face moves next week," Katsuki shrugged, waving toward the house through the trees. "Instead of stressing about paying your damn bills alone, you and Bunny can come live here."

Izuku burst into tears again, and Katsuki was almost alarmed. It had only taken a week of their three months together to learn how much of a damn crybaby the guy was, always blubbering about beavers holding hands or some shit.

"You called her Bunny!" he sobbed.

"Is that why you're crying?" Katsuki snorted, reaching across the table with a napkin to dab at freckled cheeks. "You're gonna drown yourself if you're not careful."

"Can I really?"

"Drown yourself? How should I know? You're the damn doctor here."

"Move in!"

"Oh, that? Nah, offer had a time limit of like three crying fits, you failed."

"Kacchan."

"Of course you can, dumbass. You think I'd say it if I didn't mean it?"

"I want to! I will! Move in!"

"Yeah?"

"Yeah!"

"I've only got one spare room though," Katsuki shrugged, taking a bite of his own dinner finally. Yep, damn good. "And Bunny already claimed that one."

"So I have to sleep with Kacchan?"

"I was thinking on the couch, but I guess I could learn to share."

"I'm warm!"

"That's a pretty persuasive argument. Alright, you're in."

"I'll bring my stuff on the weekend," Izuku sniffled, smiling wide all the same. "Thank you!"

"Don't thank me, idiot. This way I might get to see you once in a while."

"I'm sorry, I know my schedule is-"

"It was a joke, Deku."

"O-Oh."

"Any time is fine," Katsuki grumbled, blushing a little as he looked away. "I don't care how much, as long as it's with you."

Izuku leaned across the table, grabbing Katsuki by the shirt and yanking him in for a kiss that clearly lacked experience. The nerd had spent too much time studying surgery and not enough studying anatomy, clearly.

"Eat your dinner," Katsuki smirked. "We'll pick this up again later."

Izuku practically inhaled his food, the noises of enjoyment almost obscene. He moaned and whined and somehow slurped at the rice, and Katsuki found himself shaking his head fondly.

He was so far gone for the idiot.

He'd had all these grand plans for how they were gonna snuggle up with a blanket like some cheesy teenage couple, hot chocolate in hand as a romantic movie played on the television. He already knew it wasn't going to be perfect considering summer had barely ended and it was still stupidly hot, but he had never expected to forgo it completely.

Here he was, though, the nerd's hand nervously entwined with his, watching Izuku bite at his lower lip nervously.

"Do you think I should see this bedroom, before I move in?"

"If you want," Katsuki answered slowly. "You wanna see if my bed is comfy enough?"

"Yeah, I really should."

Katsuki could feel the tension as they climbed the stairs together, both of them equally terrified of misreading the situation or screwing it up, but when they reached the landing outside Katsuki's bedroom, he paused.

"Oi, Bunny," he called, leaning over the railing to look down at the rapidly growing cat. "You stay downstairs, got it?"

She rolled onto her back to blink up at him, pausing for a moment before she returned to taking a bath, and Izuku shook his head fondly as he dragged Katsuki into another kiss.

"She's a big girl now," Izuku assured him, smiling against Katsuki's lips. "She'll entertain herself for a little bit, even without Daddy Kacchan around."

"Isn't it a little early for the kinks?" Katsuki snickered, watching Izuku burn bright red. "You bring the lube like I told you?"

"K-Kacchan!"

"I'm kidding, nerd, I have it right here."

He pulled open a drawer in his nightstand, pulling out a brand new bottle he'd picked up in the hopes it might get used eventually, and Izuku whined quietly as he sat down on the edge of the bed.

"You okay?" Katsuki asked, gently combing messy hair back from the pink face. "We don't have to."

"Don't you dare stop," Izuku insisted. "You're just so hot and it's not fair."

"You're whining because I'm hot?"

"Yes!"

"Damn, I'm good."

"Kacchan!"

Despite his embarrassment, he didn't object when Katsuki stripped him off, peppering sweet kisses over his skin as he moved. With fumbling fingers, Izuku dragged the dark tank top over Katsuki's head to match, taking a moment to stare in awe at the chest and stomach looming over him.

"You like what you see?"

"God yes."

"Good answer."

Katsuki kicked his pants and boxers off, and for a few long minutes they just lay there together, skin pressed to skin, hands exploring each other's body. Izuku lingered an embarrassingly long time on thick biceps and a broad chest, forgetting that it was even an option to go below the belt until Katsuki grabbed a handful of his ass and squeezed.

"Doctor Booty reporting for duty," he snickered. "You've got a good little ass on you, for a nerd."

"I t-try to go to the g-gym or r-run and stuff, I'm just b-busy," he gasped as Katsuki's lips trailed down his neck, pausing occasionally to nip at him lightly. "U-Uraraka t-takes me to spin c-classes sometimes? They're f-fun."

"Remind me to thank her," he grinned, sharp-toothed and scheming. "These thighs and this little ass are delicious."

He emphasised his point by burying his head between them, taking a long lick and feeling the muscular thighs clamp down on his head. That was a kink he'd have to think about later too.

He lubed up a finger as he toyed with his tongue, loosening up the tight little hole enough to get the digit in. Izuku moaned long and loud, pressing down into Katsuki's touch, and Katsuki barely managed to hold back his laugh. Stretching him was gonna be a lot easier than planned, if he was gonna moan like a little whore the whole way through.

When Katsuki resurfaced, Izuku fumbled for him desperately, wrapping his arms tight around Katsuki's waist for a hug. He was such a damn sap, always wanting to be held even when he was fucking himself open on Katsuki's fingers.

"More, Kacchan," he insisted, even when Katsuki slid a third finger in and stretched him wider. "Wanna feel you."

"Yeah?"

"Yeah."

Katsuki nodded, quickly tearing open a condom and rolling it on, stroking Izuku's thigh as he got them both set up. He half-expected Izuku to stop him at the last second, but he was practically gagging for it, fingers clutching at Katsuki's back as he moved.

"Ready?"

"Please," Izuku gasped. "So ready."

With a strong grip on Izuku's thighs, Katsuki pushed his way in, feeling the slick slide of lubed condom against equally lubed ass, Izuku clenching at him desperately every inch of the way. When he reached the base, he paused for a moment to make sure they were both comfortable, even leaning in to give Izuku another quick hug.

"Feel okay?"

"More, Kacchan."

He began to let go, to lever himself back up, but Izuku shook his head stubbornly, holding on tight.

"Like this."

"You want me to hug you while I fuck you?"

"Kacchan is amazing, you'll figure it out."

"I'll try, I guess," he chuckled. "Okay, gonna move."

Izuku nodded, pressing his nose into Katsuki's neck, but Katsuki pretended not to notice the way Izuku breathed him in. He shifted one hand to a warm lower back, then began to pull out, relieved that Izuku seemed to relax a little and let it happen rather than clutch at him like before. When he snapped his hips, though, Izuku moaned again, hot and desperate against Katsuki's skin, and Katsuki could have sworn he almost came then and there.

"Fuck, Deku, you feel so good," he hissed, nipping at Izuku's neck a little harder this time. "Been thinking about this for so long."

"Shoulda told me," Izuku murmured, licking a stripe up Katsuki's neck as he thrust his hips again. "I wanted in your pants on our first date."

"Shoulda told me," Katsuki snorted. "You're the innocent one."

"I'm not- ah, again! - not innocent!"

"Oh yeah?"

"I went to university, K-Kacchan, I did worse than – ah, god, yes – worse than anal."

With a little snort, Katsuki thrust up into him roughly, finally pinpointing the perfect spot to make Izuku gasp and moan and plead, chanting his name over and over, until with one last yell he spilled cum between their stomachs. It dripped between Katsuki's abs, and Izuku almost came all over again when he saw it, instead reduced to a long whine as his body filled with warmth.

After a long, quiet minute, curled in each other's sticky arms, Katsuki finally pulled out and removed his condom, knotting it tightly and dropping it in the trash. Izuku smiled when a packet of wet wipes hit him in the face, fumbling a few out to start cleaning them both up.

"Can we cuddle?" he asked pathetically, biting at his lower lip again in that way that was so stupidly attractive to Katsuki's weak brain. "Even just a little?"

"Course we can fuckin' cuddle," Katsuki snorted. "Just let me open the door first."

"Huh? How come?"

"Don't want Bunny to get lonely."

Izuku giggled as Katsuki got up, depositing their damp tissues in the trash, and sure enough he cracked the door open for Bunny to find her way in.

It was barely dark outside, since they'd only come in from the garden at sunset, but Izuku had been up early, and he was suddenly so damn tired. He wanted nothing more than to just curl up and fall asleep, ideally with Katsuki's unbelievable biceps wrapped around him again.

"Tired," Katsuki yawned, stripping off a soiled blanket and tossing it aside before he crawled in under the clean ones. "Sleep with me."

"I thought I just did," Izuku giggled.

"Literally, nerd."

He dragged Izuku into his arms, holding him close, and Izuku giggled with an unbelievable sweetness as he planted a kiss on Katsuki's cheek. With the blankets hiked up to cover their bare skin, he felt so safe and cozy, and he never wanted to leave his little nest.

"Hey Deku?" Katsuki murmured, already half-asleep, but managing a smile when he felt Bunny jump up at their feet.

"Hmm?" Izuku yawned, rubbing their cheeks together happily. "What's up, Kacchan?"

"Next time can you wear the white coat?"