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

Chapter 8: "Fuck the rules"

While explosions in general tended to make most people uneasy, Katsuki thought there was something particularly unsettling about them for him personally. To hear those familiar sounds coming from a source far away from himself, when they should be coming from his hands, made him feel a strange kind of nausea.

He was also the first one to recognise them, every single time. When fireworks went off, while his classmates looked out the windows to make sure everything was okay, Katsuki was still tucked into his armchair with a book. But when there was even the faintest sound, way in the distance, of something blowing up, Katsuki was out the door in a heartbeat.

He'd been the first one out of his seat, when the commotion began. Izuku had been right behind him, well aware of Katsuki's explosion-sense, but he hadn't hung around long enough to see who else had followed. He was already blasting himself over heads, dodging crowds of confused people, as he headed for the back gate to the school.

Sure enough, the supposedly-indestructible fence was shattered, and Katsuki could hear people panicking and running for help behind him as he launched into the fray, tackling a man in a black mask. He heard the crunch of Izuku's fist breaking a face off to one side, not bothering to look up, instead settling for shoving a hand on the back of his target's head, grinding his face into the dirt as he popped off minor explosions.

"Tell me who you're working for or I'll blow your face off, fucker."

The rest of the battle passed in a blur. Katsuki was aware of Izuku at his side the whole time, the pair yelling directions and warnings at each other, but he wouldn't have been able to repeat a word that left either of their mouths. It was like he'd been put on auto-pilot, his body doing what it knew it was supposed to do, what it had been trained to do, while Katsuki himself zoned out in the back of his own mind.

He didn't fully come back to reality until a small hand grasped his, strangely fuzzy, and he looked down to see the Principal shaking his hand.

"You two did some amazing work today, I am proud to call you both students of this school."

He glanced over to see Izuku blushing beside him, and nodded faintly, wide-eyed.

"Th-thanks?" he mumbled. "I was just doing what I'm supposed to do."

"You saved dozens of people from injury – or worse – by the time any of your teachers even arrived on the scene. That is a commendable effort, Bakugou. Keep up the good work."

Izuku gave him a wobbly smile when their eyes met, and after a minute Katsuki softened, finally letting his aching muscles slump. He could really go for a nap, come to think of it.

"You were amazing!" Izuku gushed, the moment they left the office. "Kacchan! You're so cool!"

"Whatever."

"I mean it! You were so awesome!"

"I don't remember any of it," Katsuki confessed. "I mean, I do, but it feels like a memory from years ago. I just kind of acted without really thinking about it."

"Amazing," Izuku repeated, his fingers curling around Katsuki's bicep. "Watching you was amazing too."

"If you want to fuck me, just say so," Katsuki snorted, looking away awkwardly even in the empty hallway. "No need to be weird about it."

"I really, really do."

"Come on then, nerd. Come show me how you treat a hero."

Izuku bit down on his lower lip, gripping a little tighter as he hurried his pace. Katsuki scoffed at him, but matched his pace nonetheless, power-walking toward their dorm building. He released his hold reluctantly when they reached the front entrance, the pair exchanging a look of understanding as they pushed the doors open.

"Going to bed," Katsuki grunted, when people began to praise them excitedly. "Exhausted."

"Understandable!" Eijirou agreed, nodding almost aggressively. "You can tell us all about it in the morning!"

"Whatever," he shrugged, marching straight through to the elevator, oddly irritated by the dumb nerd laughing sheepishly with his friends, unable to tell them to piss off. "Make me breakfast, if I was that great."

"I can try!"

The doors slid closed and Katsuki sighed with relief as he made his way to his bedroom, staring at his wounds in the mirror near his door. He hadn't realised just how beat-up he looked, or he might have been embarrassed by it. His lip was split, the blood drying down his chin, and he was pretty sure he had the beginnings of a black eye on his left side. It made him look tired, which had probably helped him out in the common room. His hair, too, was a mess of blood and dirt, and he wondered if maybe he should have taken a shower on his way through.

The knock on the door was demanding, and until he heard the familiar voice, he almost could have thought one of his lame-ass friends had followed him. But sure enough, that dumb nickname passed through the door, and Katsuki sighed as he pulled it open.

"I'm gonna fuck you so hard," Izuku said firmly, slamming the door closed and fumbling for the lock. "Get your pants off now."

"And if I refuse?"

"Then I hope you have a spare uniform in your closet because I'm gonna fucking tear those pants off."

Katsuki smirked, but obediently peeled off his disgusting uniform – which would probably need replacing either way, if he was honest. Izuku stripped himself in record time, slamming Katsuki into the wall as he drenched them hurriedly in lube.

"Move, put your- no, the other- Fuck this." Izuku gave up on the directions immediately, instead hoisting both Katsuki's legs up and leaving him to rely on trust and wall to keep him balanced. He blushed when Izuku hitched pale legs up over his shoulders, leaving his ass exposed and pointing straight at Izuku's crotch, his hands fumbling for something to hold on to.

"You trust me?" Izuku asked bluntly.

"Yeah."

"Then stop panicking," he frowned, freeing one hand to grip at Katsuki's wrists. "Up here, don't move them."

Katsuki pressed his hands to the wall, up above his head, hating the way it made him feel like his chest was sticking out, his back already arching under Izuku's touch. Before he could voice his complaints, Izuku was brushing against his hole, shoving some lube inside before he thrust up in a hurry.

The longest, loudest moan he'd ever produced came from Katsuki's lips, as he sank down onto the long, thick shaft. He liked Izuku's cock far too much, he knew, but it was insane the way it seemed to fit him so perfectly.

Unless all dicks were like that, maybe the ass just adjusted to whatever was in it? Katsuki had no idea, honestly. He should really look more of this stuff up on the internet when his dumb friends weren't around.

There were no toys, was no drawn-out foreplay, was no teasing, but Katsuki was panting harder than ever, feeling every movement as he sank down to Izuku's hips and roughly felt himself pulled back off. Again and again, gravity pulling him down hard with the aid of Izuku's bruising fingers on his hips, and all Katsuki could do was gasp and moan.

"I'm gonna fuckin' cum," Katsuki growled, when he felt himself get close. "Touch me, Deku. Take those damn hero-hands and jerk my hero-cock."

Izuku scoffed a little, but wrapped his fist around the base regardless, pumping him in time with the rough thrusts that had him sliding up and down the wall. His back would be grazed in the morning, he was sure, but he could pass it off as battle wounds if anyone noticed. One thing was for sure, he was getting a house with fucking smooth walls when he graduated. Textured dorm shit was hell on the skin.

"We fuckin' saved people," Katsuki moaned, as Izuku pumped him mercilessly. "All those assholes, man. 'You act like a villain' and 'Quirkless kids can't be heroes', we fuckin' showed them, huh?"

"Fuck yes," Izuku grinned, squeezing a little tighter. "Best fucking heroes in the world."

"Screw Endeavor and Hawks, bring me the Wonder Duo."

Izuku came immediately, a sticky combination of lube and cum dripping onto the carpet as he rode it out, vaguely aware of a warmth in his hand as Katsuki joined him. He pumped them both slowly, milking out every last drop, and soon he was setting Katsuki down on shaking legs, leaning in so close he could practically taste Katsuki's sweet sweat, bracing himself against the wall for support.

"God damn, Kacchan," he said breathlessly, his eyelids fluttering closed. "Is that the most straightforward sex we've ever had?"

"Fuckin' endorphins," Katsuki mumbled, hands shaking as he folded them around himself, suddenly so cold. "Gotta w-work off the fight, you know?"

"Are you okay?"

He nodded, and Izuku forced his eyes back open, surveying the way Katsuki had suddenly become pale and nervous before him.

"Come lie down," he insisted, leading him to the bed with little protest. "I'll find you some clean sheets later, you need to at least sit."

He turned on the electric jug Katsuki kept on his desk, setting up to make them both tea, watching Katsuki out the corner of his eye. His breathing was shaky, and he didn't move from the spot where Izuku set him down, his eyes fixed on the carpet.

"C'mere," Izuku insisted, ushering Katsuki onto the bed properly and tucking blankets around him. "Are you okay, Kacchan? Do you want to talk about it?"

Katsuki shook his head, and Izuku shoved a warm mug in his hands, watching him take a shaky sip of the hot tea. It was his favourite, Izuku knew. Made exactly how he liked it. Izuku had mastered that years ago.

He crawled under the covers with his own mug, snuggling into Katsuki's side, not sure whether to be pleased or concerned when he got no complaints for the action. For a long time they remained silent, sipping at their tea side by side. When their mugs were empty and set aside, he slid down the bed, dragging Katsuki in for cuddles. Still he got no objection, just a slightly-less-pale face shoved into his chest, and he stroked at matted blond hair until he felt the telltale shudder.

"Kacchan?" he whispered, leaning his cheek on the same hair. "Are you okay?"

Katsuki hummed noncommittally, and Izuku sighed, wiping stray tears from a warm cheek.

"Talk to me. Please."

"I can't."

"Why not?"

"B-Because," Katsuki stuttered, sniffling a little. "I broke the rule."

"Which rule?"

"I should have been honest with you weeks ago."

Izuku was hit with a burst of guilt, almost ashamed of himself for breaking a rule of his own so easily, without being so upset over it like Katsuki was. He knew Katsuki's reaction was too much, a result of a flurry of different emotions all smushed together inside his lithe frame, and a young boy who was held to such high standards, unable to learn how to resond healthily.

"I forgive you, Kacchan," he said instead, shoving his own thoughts and feelings aside in favour of the fragile young man in his arms. "Whatever rule you might have broken, whatever you may have done, I promise, no matter what, I forgive you. Just tell me, please, so I know what we're dealing with here. You're scaring me, Kacchan. I don't want you to hurt like this."

"I lost."

"What?"

Izuku felt like the air had been slammed out of him, like a rough tackle had landed in his stomach during training, or like he'd fallen from a high place and landed face first.

"I lost," Katsuki repeated, a little softer but less shaky this time. "I fell in love with you."

Izuku wove a hand under a clenched jaw, gently stroking up to his chin, nudging it back until he could see the terrified eyes. They were oddly dull, almost brown rather than red, lifeless with his strange terror. He leaned in, angling himself just right, careful to control himself despite the urge to grab and pull and yell and scream. He was gentle, sweet, and did his best to convey every word that needed to be spoken between them with just that one touch.

When their lips met, it was like they were made for each other. Even with dried blood and fresh wounds, even with tears making them somehow dry and sticky at the same time, even with the way both their hearts pounded in their chests like they might burst through their ribcages in a matching act of rebellion. Even with every possibility conspiring against them, it was so, so perfect.

Izuku never wanted to stop, never wanted to part, never wanted to feel the aching cold of his lips being his and his alone, ever again in his life. He wanted to stay wound together, tangled in each other's limbs, his hand bracing a slowly slackening jaw as they became one.

"I stole your first kiss," Izuku smiled, parting barely enough to speak. "Now you're gonna have to date me."

Katsuki was cross-eyed, they were so close, and something about the whole combination of every stupid little thing made Izuku giggle.

"Are you breaking the rules just to make me feel better?"

Izuku answered him with another kiss, a little less gentle this time, a little more demanding as he pulled Katsuki in tighter, letting strong arms wind mindlessly around his neck as he gave in and let himself indulge. It was just as perfect as the first - more perfect, if that was possible, even though Katsuki had no idea what to do with himself and Izuku was some mix of nervous and excited that left him with no clue how to act.

"Kacchan?" he whispered, brushing blond bangs back from a pale forehead.

"Mm-hm?"

"Fuck the rules."