[NSFW!!!] 8 Simple Rules (for screwing my Childhood Friend) - Chapter 7

Chapter 7: No talking about All Might in the bedroom.

Izuku was ready to collapse the moment he walked in the door. He wasn't even sure how he'd made it onto his train, let alone walked back to the dorms after. His legs were jelly – his entire body was jelly, in fact. He was ready to just fall face down on his bed and not move again for an entire week.

"Deku!" Uraraka gasped, rushing over to inspect his wounds. "What happened?!"

"Ran into a fight," he smiled awkwardly, fighting his shoes off to slot them away. "Big enough that the Pros let me fight, which is both the good news and the bad news."

"Are you alright?! Do you need anything?! Are you hurt?! Did you win?!"

"I'm fine, and we won. I'm just exhausted, I'm gonna tear off this sweaty costume and go straight to bed. Next time I get a costume upgrade and decide to stick with the jumpsuit, remind me of this day. There is sweat pooling in my socks."

"Maybe you should take a shower."

"Ugh. You're probably right. This sucks."

"Well, good job, anyway! You worked hard today! Well done!"

"Thanks, Uraraka," he smiled softly. "Have a good night, I'm gonna head for shower and bed."

When he headed for the elevator, he was surprised to find Katsuki sitting on the floor, leaning into the corner. His eyes widened when they took in Izuku's beaten and bruised form, and immediately he was clambering to his feet, surveying the damage.

"I'm okay," Izuku assured him with a soft smile. "We just ran into some trouble on patrol."

"Yeah, I heard all about it on the news," Katsuki nodded faintly. "You must be tired."

"I am."

"C'mere, then. I'll give you a hand."

For the first time Izuku noticed the little plastic basket on the floor, filled with familiar bottles. Katsuki scooped it up, tucking a fluffy towel under his arm that Izuku was pretty sure he didn't own, and with a little jerk of his head, Katsuki led the way to the bathrooms.

Izuku couldn't help but smile at him as he set out bottles and bars in a shower stall, stacking towels and clean clothing on a shelf, and reaching for the zip on Izuku's jumpsuit. He smirked as he pulled it down, trailing a spare fingertip down the bruised skin, gently stripping off the clingy fabric with tender hands. He tore off his own clothing with much less care, dragging Izuku into the stall, and soon they stood together under hot, soothing water.

"That feels good," Izuku sighed, slumping into Katsuki's arms. "Thanks, Kacchan."

"Just getting started," Katsuki smirked, shifting him into one arm to reach for the soap. "Tell me if any of the wounds hurt, alright?"

"I will."

Izuku closed his eyes, leaning into Katsuki's shoulder, savouring the touch as Katsuki gently cleaned him off. He was surprisingly good at it, somehow. Izuku always expected rough hands and tight grips, but Katsuki treated him like the most fragile of creatures, every touch filled with care.

"Feels good," he murmured again, sighing faintly. "Thanks, Kacchan. I needed this."

"Don't thank me yet. You owe me now."

"Sure," Izuku smiled. "I owe you."

He let his body go limp, moving with Katsuki's touch, letting himself be shifted and turned as Katsuki cleaned and disinfected his wounds. When his body was deemed suitably clean, Katsuki lathered up his curls, rubbing circles on his scalp that made Izuku hum. With a little smile Katsuki continued, scratching at his hair for much longer than really necessary before he rinsed the shampoo out and repeated the process with conditioner.

"I feel so much better," Izuku mumbled into Katsuki's neck. "Thank you, Kacchan."

"Time to get dressed?"

"If I have to."

Katsuki smirked again, but turned off the water nonetheless, reaching for the towels. It was the softest towel Izuku had ever felt, and he very nearly started moaning outright as Katsuki dried him off.

"Not my towel," Izuku murmured.

"They're mine. Pretty new."

"You bought new towels?"

"My mother got them for me, she knows I like soft towels. Her way of showing love, I guess."

"M'happy."

"Good."

"M'tired."

"Figured," Katsuki snickered. "You wouldn't be nearly this lenient otherwise."

"M'not allowed to be soft sometimes? Gotta order you around all the time?"

"You can be soft, it's okay," Katsuki assured him. "I'll cope."

"M'ready for bed."

"You should eat first."

"Don't wanna cook."

"You don't have to."

He dressed Izuku in his warmest, softest sweats, bundled up warm and cozy, and Izuku blushed when he saw the soft look in Katsuki's eyes. He wasn't used to such a tender Katsuki, didn't think he'd ever get used to that, but maybe he was starting to understand a little of why Uraraka and Asui kept asking questions about their friendship.

"Come on, upstairs."

Izuku blinked a few times, watching Katsuki gather up their things, and took a shaky step forward to follow. Katsuki glanced back at him, pausing, and Izuku shook his head quickly.

"I'm okay, I swear."

Katsuki waited a moment for him to find his balance, then led the way back to the elevator, to where Katsuki was sitting in wait not twenty minutes ago.

"Were you waiting long?"

"No, I made a pretty decent guess at when you'd be back."

"Thank you. For all of this."

"It's fine," Katsuki reached back, ruffling damp green locks. "Don't tell anyone shit."

"I wouldn't."

They trudged their way to Izuku's bedroom, Katsuki holding the door open for him, and Izuku froze, sniffing at the air. The smell was unmistakable, and he was torn between searching the room or looking at Katsuki in wonder.

"Sit," Katsuki directed him, nudging him at the little table in the middle of the room. "Get comfy."

He dropped onto a cushion obediently, finally looking back to see Katsuki at the desk with a rice cooker he'd never seen before, a foil bag sitting beside it on the table. He dished out food, arranging it quickly but carefully, and soon Izuku had a heaped bowl in front of him. His eyes watered and he sniffled a little, looking up in awe at Katsuki's flushed face, watching him sit down opposite with his own bowl.

"I knew you wouldn't cook," he explained. "Wanted to make sure you got sustenance. You skip meals too often."

"It's not that often!"

"Too often."

With a little smile Izuku dug in, moaning obscenely as he took his first bite. Katsuki blushed again, looking away, and Izuku couldn't help but giggle at him.

"You're the best, Kacchan," he said with utter sincerity, "Such a good boy."

Katsuki didn't object, didn't argue, and Izuku smirked as he took another bite.

"Is that what this is about? You want more praise?"

"I wanted to help."

"Because you wanted me to tell you how good you are."

He grumbled something inaudible, and Izuku leaned in closer, meeting stubborn red eyes.

"You're such a good boy for me, aren't you? Bathing me, cleaning my wounds, cooking me food. I bet you'd do anything else I asked for, too, huh?"

Katsuki nodded, swallowing hard, and Izuku smirked.

"Finish your food, then you can take care of me some more."

"Okay."

He scoffed his food down and Izuku struggled to not choke as he held back his laughter, calmly savouring his food as Katsuki hurried.

"Um, what do you want me to do?" he asked, setting his dirty dishes aside.

"You decide, Kacchan. Think of what might help me or make me happy, just like you've been doing all night."

Katsuki hovered for a moment, hands twitching, looking around the room slowly before he settled on grabbing another towel. He knelt down at Izuku's back, and after another brief hesitation, he reached for Izuku's hair. Izuku practically purred when Katsuki began rubbing gentle circles on his head, gently squeezing the water out of his hair. He smiled softly, relaxing into Katsuki's hands, and Katsuki seemed to become a little more confident.

"Keep going, Kacchan," he mumbled. "Makes me feel good."

"Okay."

When he finished his dinner, he lay back into Katsuki's lap. With his hair mostly dry, Katsuki set the towel aside, instead gently combing his fingers through, making Izuku purr again. He looked up at Katsuki with big, shining eyes, and Katsuki felt his heart thump nervously as their gazes met.

"I really appreciate this, Kacchan. I hope you know that."

"I do. I know, I mean."

"You take care of me so well," he smiled, reaching up to wind his hands around Katsuki's neck. "You're gonna make someone so happy one day. You'll be the best husband."

"No one will ever want me."

"A thousand people will want you. You're the picky one."

"No one I want will ever want me," he amended. "The type of people I like are..."

"You're not seriously going to say 'too good for me' are you?"

"No," he snorted. "Just not the kind of people who would like me back."

"Is there someone you like?"

"Maybe. Kind of."

"A guy?"

"Yeah."

Izuku nodded faintly, averting his gaze.

"If you want to pursue him, I'll understand if you want to... You know. Break this off."

"I don't. I enjoy this."

"Okay. Just... You know, keep me updated."

"I will."

They fell silent for a moment, Izuku's hands still locked behind Katsuki's neck, his head still resting in Katsuki's lap.

"Come lie down," Katsuki said finally, shuffling back a little to free him from the table. "I'm gonna... I'm gonna rub your feet. They're probably sore, right?"

"Yeah," Izuku smiled. "That would be really nice."

He moved to the bed, getting comfortable against his pillows, and Katsuki sat cross-legged at the bottom, pulling both feet into his lap. He pressed firmly with his thumbs, and Izuku didn't bother to stifle his moan, his head falling back as Katsuki worked. There was no way it was his first time, he must have been practicing for years, but Izuku couldn't even find the words to ask about it.

Katsuki just smirked to himself, working his way up and down the callused skin and tight muscles. He could feel Izuku falling apart under his touch, putty in his hands, and despite a hint of guilt for the underlying motives, he knew he'd be getting exactly what he wanted later. Or the next day, if Izuku was really that tired, but he suspected Izuku would soon be plenty awake.

"C'mere," Izuku demanded, holding his arms up. "So good, Kacchan."

He smirked as he gently lay himself in Izuku's grip, leaning his cheek on a strong shoulder.

"You've been so good for me, Kacchan. I'm so happy."

"I'm glad."

"Want to have some fun, now?"

"If you're not too tired."

"Never too tired for you," he smiled softly. "What would you like, Kacchan? I'll do anything you want, tonight."

"Anything?"

"Anything," he confirmed. "Just tell me what you want me to do."

"Mm..." Katsuki sighed, struggling to meet Izuku's eyes, but forcing himself all the same. "I want Master to collar me and fuck me hard."

"Feeling subby today, huh?"

"As rough as you can," Katsuki nodded. "Can you?"

"Course I can," Izuku smirked, pushing himself up onto his elbows. "You gonna keep being good for me, Kacchan?"

Another nod.

"I know you will. You've been so good, haven't you? So lovely and sweet, and so hot. Cooking is super sexy, you know. Especially cooking my favourite just for me. And giving me a foot massage? Hottest thing I've ever seen."

Katsuki blushed, eyes darting down for just a second, and Izuku took the opportunity to flip him over, pinning him against the mattress.

"Hands in place, Kacchan. No touching unless you ask nicely and I say it's okay."

He nodded, bringing his hands up to grip at the pillow, and Izuku stripped their clothes off with fervor. He had no shame about being bare anymore, no self-consciousness about his dick springing free in his face, and Katsuki, too, seemed oddly comfortable with the concept these days. It hadn't taken them long to get there, to go from their awkward ignorance to where they were now, but every moment of the journey had been worth it.

Izuku pulled the collar around Katsuki's neck, fastening it nice and firm, and leaned in with a smirk to kiss the leather. He still loved the way it looked, never got tired of seeing the dark, thick material wound around him, nor the shiny silver tag that hung over his throat.

"You look so good, Kacchan," he murmured, trailing his lips along the edge of the collar. "I like this so much. You look so hot."

"It feels good," Katsuki admitted.

"You like having something around your throat?"

Katsuki nodded, halting immediately when Izuku's hand wrapped around his neck, pressing him into the pillow firmly. His breath caught, and Izuku smirked, watching the red eyes widen.

"Like this?" he teased, pressing a little harder. "Is that what you want?"

Katsuki nodded, and Izuku grinned. He kept one hand around the throat and collar, moving the other to reach for the lube, trailing it between Katsuki's cheeks. He didn't bother to prep him, just slicked them both up and positioned himself, watching eagerly as he pressed down tight with his grip and stuffed himself inside at the same time. Katsuki choked a little, his cock twitching, moaning lewdly as Izuku filled him up. It burned a little as he stretched, but he'd grown to like that feeling – was usually begging for it, in fact, while Izuku was too nervous to agree.

"Nice and full, Kacchan?" Izuku teased. "Just how you like it? Stretched tight around my hero-dick?"

Katsuki nodded wildly, and Izuku shifted his grip, tilting the head back firmly.

"Use your words, Kacchan."

"Yes, Master. So good. Feels so good."

"You're such a needy little whore, aren't you? Can't stand to be left empty."

"Yes, Master. Please don't stop."

"I would never, Kacchan. Not until you're so fucked out that you can't move or breathe."

"Please."

"Such a good boy."

Izuku smirked as he nuzzled into Katsuki's neck, kissing the skin that remained above the collar, and Katsuki's breath shuddered. He felt powerless, lost to Izuku's control, and something about giving himself over was too satisfying, too thrilling, too perfect.

"Let's get these out of the way," Izuku smiled, when Katsuki began to relax around him. "Up here is good."

He pushed Katsuki's legs back to his chest, leaving his perky little ass exposed to Izuku's whims, and sure enough Izuku hummed contentedly as he shuffled. He rose up on his knees, propping Katsuki's hips on a pillow for easier access, and as he leaned forward to loop his hand around the collar again he caught a flash of nerves in Katsuki's eyes.

"You remember the word, right?"

"Yeah."

"Don't be afraid, if you need to use it."

"I know."

Izuku pushed down harder this time, shoving Katsuki's head into the pillow as he slowly began to roll his hips, and soon Katsuki was moaning uncontrollably. He could hardly breathe, couldn't move, but something about the combination of being helpless, yet so protected, and so well fucked, made him weak. It was too delicious, everything he'd ever dreamed about and more. He was pretty sure he could describe even his lewdest fantasies to Izuku and the nerd wouldn't even bat an eyelid at him. He would set to work figuring it out, how to make it happen and make it work, and by the time Katsuki found the presence of mind to question his choice, Izuku would have it sorted, their props in transit to the dorm by morning.

"Aww, can't have this now can we?"

Katsuki jolted back to reality when Izuku gave him room to breathe, watching the hand wander down his body and grip tight around the base of his cock.

"Leaking already, Kacchan? Don't forget the golden rule."

"Not before M-Master," he nodded, back arching as he pressed into Izuku's touch. "I w-won't, I promise."

"You're being very good tonight, aren't you? Much better behaved than you usually are."

"Want to m-make Master h-happy."

"What happened to honesty, Kacchan?"

He paused, cheeks flushed, and nodded faintly.

"Won't get what I w-want if I'm stubborn."

"Better."

He released his hold on Katsuki's cock, getting a little whine in return and ignoring the chuckle Izuku aimed at him. Finally he lifted his pace, thrusting into Katsuki a little more violently, and Katsuki threw his head back again, panting and gasping for air.

"Who do you belong to, Kacchan?"

"You, Master."

"Damn right. Say it."

"I belong to you, Master. No one else. You can... You can use me as much as you want. For whatever you want. I'll take it like... Like a good little whore. I promise."

"Fuck, Kacchan," Izuku hissed, gripping tight at Katsuki's hips as he raised his pace once again. "Fuck yes."

"Cum inside me, Master. Fill me up. Please? I promise I won't let it spill."

"Fuuuuck."

A hand reached for his throat again, and as his vision went white, he felt Izuku cum, felt him fill Katsuki's ass just the way he liked it.

"Please," he whined breathlessly. "Please, Master, I want to cum too. Please. Please?"

"Do it. Now. Cum for me, slut."

The noise that came from Katsuki was long and loud, far higher in pitch than Izuku could have anticipated. His hips jerked, and Izuku wrapped his hand tight around Katsuki's shaft, meeting his thrusts with fervor. He came more than Izuku thought he'd ever seen before, an endless stream of fluid, spilling all over Izuku's hand, over his own crotch, trailing down to his hole still squeezed tight around Izuku's much softer cock.

"God, Kacchan," he choked out, when the thrusts calmed, when Katsuki fell back limply to the bed. "You liked that, huh?"

Katsuki nodded.

"That's what happens if you're good. Do you understand now? If you do what I ask, I'll do what you ask too. Be good for me, and I'll give you everything you want."

"I will," Katsuki whimpered. "Always. I promise."

"Don't make promises we both know you won't keep, Kacchan," Izuku laughed, reaching for the plug as he slipped himself out. "Relax for me."

Reluctantly Katsuki let his muscles soften, and Izuku slipped the plug inside of him, filling him up all over again. He shifted a little, feeling it move with him, and Izuku shook his head fondly as he climbed up.

"Hold still, gonna clean you up."

He left to retrieve warm, damp towels, wiping Katsuki down carefully, then himself to match. Katsuki was half-asleep already, his eyelashes playing against his cheeks, fluttering just slightly when Izuku moved around him. His breathing had slowed significantly, to a more restful and less harried pace, and Izuku smiled as he cleaned sweat off his face.

"Better?"

"Better."

"Want me to stay with you?"

He nodded, and Izuku crawled back onto the bed, making one last check for any spills before he pulled the blankets up to cover them. It was a comforting routine that they'd taken far too long to develop, the familiar touch of each other's grasp filling each of them with a faint joy – not the blustering kind that screamed from the rooftops, but a quiet softness that filled them both with a warmth long forgotten, pushed aside since they were children sharing a blanket in front of All Might cartoons.

"Kacchan?"

"Hmmm?"

Izuku snuggled in, smiling to himself as he settled comfortably.

"I'm glad we're doing this."

"Yeah," Katsuki acknowledged, a short sigh sending warm breath into the crook of Izuku's neck. "Me too."

─────

"I have a surprise for you"

The text was oddly exciting – Katsuki had never been the one to initiate new toys and the like, so as Izuku sat back on his bed, he couldn't wait to see what was in store for them. It had to be good, if Katsuki was the one coming up with it.

A loud knock, and Izuku sat up eagerly.

"Come in!"

His jaw dropped when the door opened on Katsuki's smug face, a navy blue cape swinging from his shoulders, bright red spandex clinging deliciously to his pecs.

Only...

"Kacchan," Izuku sputtered. "What are you doing?"

"What does it look like?"

"I... I just... Look, I appreciate the effort, but this is... Kind of weird."

Katsuki cocked an eyebrow at him, folding golden arms across his chest.

"Are you seriously telling me that a limited-edition exact replica, made by the actual designers of All Might's famous Silver Age costume doesn'tturn your nerdy ass on?"

"He's my teacher, Kacchan!"

"Oh yeah, you'd be the first one in the history of the world to crush on your teacher," Katsuki snorted, slinging a leg over Izuku on the bed. "I am here, Deku."

"No."

Deku reached for his chest, opting to at least make the most of the incredibly clingy suit, and Katsuki smirked. He took it as permission to lean in close, biting the side of Izuku's neck and making him gasp.

"Your Hero is here, Deku. Aren't you gonna make the most of it?"

"Kacchan please," Izuku giggled, squirming away from teeth and tongue. "You're already my hero without playing dress up."

"Fuck me like you're All Might, Deku."

"Stop!"

He tried again to feel his friend up – he did look good, after all – but every time he got remotely close to hard, Katsuki found another stupid pun to make or joke to crack, and Izuku lost himself in another fit of giggles.

"Oh sorry, let me-" Katsuki cleared his throat, puffing out his chest. "Young Midoriya! Are you not hard?"

"Kacchan please."

It took a while for Izuku to finally strip him out of the costume, but finally Katsuki fell free, and Izuku breathed a sigh of relief. He was about to cast it aside when the idea hit him, instead holding it up against his chest and flashing a grin that was far too wide for his face, his eyebrows low on his forehead.

"Bakugou, my boy!" he declared, his voice booming. "Do you not understand?"

"Okay, I get it," Bakugou snorted, throwing the costume aside immediately. "Point taken, you're right, it's weird."

Izuku giggled again, and Katsuki caved to a smile, resting his cheek on Izuku's chest as they both laughed like idiots.

"At least I tried."

"You did," Izuku laughed. "Maybe leave the toys to me next time?"

"Deal."

With Katsuki muffling his laughter in Izuku's shirt, and Izuku struggling to repress his own, neither of them remained under any illusion that sex was going to happen. Even if they tried, no doubt one of them would quote another cheesy line or crack another dumb joke and ruin it all over again.

Somehow, Izuku didn't mind.

His body felt lighter as they lay together, limbs tangled, but neither of them caring. His heart thumped extra hard, just once, when Katsuki raised his head to grin at him, and suddenly Izuku's face was burning, a pink flush spreading across freckled cheeks.

Shit. He just lost.