Blowing off steam [Bakugatsu Day 10]

Brilliant title courtesy of Zel <3 Much appreciated!

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It was no secret that Izuku and Katsuki liked to sneak into the training hall at night. They were beginning to suspect the teachers intentionally left windows open or doors unlocked for them to get in, since it seemed to help keep things more peaceable in class. It was a pretty simple arrangement. No fighting in class, no arguing in front of other people, it was all saved for after-hours in the gym, alone, where they could yell and fight and punch and kick unimpeded. And then, when the night was over, they tended to their wounds in silence, and walked back peacefully to the dorms to exchange a cheerful goodnight.

No one would dare to say the arrangement was normal, but it certainly worked.

It had been a particularly rough day in class, with tensions running high for everyone, but not the least of which for the twin stars of class 3-A. Both had been fuming by the time the bell rang, jaws clenched and fists shaking as they gathered their things and stalked off without a word. Not even the bravest of their friends had dared to approach, the entire class quetly agreeing that they needed time and space to cool off.

And so, as the clocks ticked over to ten, Izuku opened a blatantly unlocked door and stepped into a dark hall. Katsuki was only moments behind, something disheveled about his appearance that gave Izuku pause. It was late for him, Izuku knew. Some days he slept rather than spar, others he took a nap before arriving, but the days he showed up tired were the worst of all – the days Izuku knew he hadn't been able to fall asleep. 

“Fight me, nerd,” he said flatly, tossing his jacket aside. “Beat me up real good.”

“Huh?” Izuku froze, wide-eyed. “You want me to beat you up?”

“I want you to try your fuckin' damnedest.”

“Fine.”

There was no warm up period, no easing into things, just a fist sparking with green lightning that landed in Katsuki's cheek without warning. Katsuki grunted, twisting away the moment it made contact, but still Izuku knew it would leave a good bruise. He hissed when Katsuki's hand landed on his ribs, firing him across the room, scrambling to find his footing as Katsuki launched at him again.

Back and forth they exchanged blows, tearing clothing, marring skin, dripping blood on the shiny wooden floors, but neither of them ever considered holding back. After years of one-sided beatdowns, they were finally an even match, and the thrill was incomparable – for Katsuki, seeing the pathetic nerd step up and offer him a challenge; for Izuku, standing side by side with his childhood friend he had always watched the back of. 

With a grunt Izuku hit the ground, a surprisingly heavy body pinning him in place, two sparking hands jamming his hands above his head. He froze, taking a moment to understand his position, then looked up at Katsuki's scowl with wide eyes. The sweaty hands shifted until one clutched both Izuku's wrists, the other moving toward his face.

“I fuckin' win,” Bakugou scowled. “Next time you shut your face and listen instead of arguing. You hear me, nerd?”

“Yeah.”

“Should just fuckin' leave you here until it gets through that thick skull that you can't beat me. I'm always gonna be on top, shitty Deku.”

Izuku's eyes drifted, staring at the pale pink lips, slightly worn by frustrated teeth. Before he knew it he was leaning in, pulling himself closer, desperately tasting those lips for himself.

Katsuki halted at first, eyebrows knitting together, but when he didn't pull away, Izuku took it as a good sign. He continued, parting his lips a little, and they curled into a smile when Katsuki's tongue darted out to touch him. 

“Take your pants off.”

“Haah?!”

“I said take them off, Kacchan!”

“What the fuck are you talking about, shitty nerd?!”

“I'm blowing you!” he insisted, sparking power in his arms to free his wrists, reaching for Katsuki's sweatpants. “You gonna stop me?!”

“Fuckin' of course not! You think I'm stupid?!”

“Then sit down, shut up, and take off your pants!”

“Where the fuck is this coming from?!”

Izuku snorted, but dragged the pants and boxers down all the same, letting Katsuki's erection pop free. He laughed again when he saw it, amused by the flush that rose to Katsuki's cheeks, and with a hand spread flat against Katsuki's chest, he sat up. 

“Get comfy,” he said firmly, wrapping his hand around Katsuki's shaft and feeling him tense under the touch. “Don't move, Kacchan.”

“Don't tell me what to do, piece of shit,” Katsuki growled, grabbing a handful of Izuku's hair. “I'll fuckin' destroy your throat if I want to.”

Izuku moaned, stifling it quickly in his arm, and Katsuki found himself quickly jolted out of his frustration and anger. The nerd was fucking in to this? Well then...

He gave Izuku's head an experimental tug, smirking when he moved without question, dragging him down to crotch level. He rubbed Izuku's cheek against coarse little hairs, watching green eyes glaze over as they stared at him.

“You want this real bad, huh?” he teased, gripping a little tighter. “You gonna take it all in like a good little whore?”

“Yeah.”

“Yeah?”

“Yes, Kacchan.”

“Nuh-uh, no shitty nicknames if you're gonna do this.”

“Yes, Katsuki.”

Katsuki's dick throbbed with the words, with the look on Izuku's face, the way his pink tongue slowly poked out to take a long lick at the side of Katsuki's shaft.

“Fuck. Fucking suck me.”

Izuku opened his mouth wide, letting Katsuki drag him to the tip, and moaned softly as he finally got to wrap his lips around Katsuki's swollen head. Katsuki eased his grip, leaning back against his hands for stability, watching as the determined nerd swallowed him down. He choked a little when Katsuki's cock hit the back of his throat, but still didn't ease up, drooling and moaning like a damn whore as he bobbed his head.

“Fuck,” Katsuki said breathlessly. “Fuck.”

Izuku hummed around him, a shock coursing through Katsuki's cock, and he finally lost control of the moan bubbling inside him. He threw his head back, moaning loudly, gasping for air, and then Izuku was swallowing. He saw stars, reaching again for Izuku's hair, just to hold on to him, and still the throat continued to convulse around him as he swallowed every last drop.

“Fuuuuuck,” he whined, cringing at the needy pitch in his voice. “Fucking Deku, what the fuck.”

“Thanks, Kacchan!” He sat up, smiling brightly as he wiped his mouth with the back of his hand. “I feel better now!”

“Next time we fight,” Katsuki stumbled, “just come to my fuckin' bedroom instead of the gym.”

“Nuh-uh! If I win, I'm on top!”

Katsuki snorted, pulling at green curls and tilting the freckled face back to survey it. 

“You'll never be on top, little bitch,” Katsuki smirked. “I'd like to see you try.”

“Sounds fun!” he giggled. “Goodnight, Kacchan! Sweet dreams!”

“Night nerd.”

He hopped to his feet and walked out, heading back to his dorm room, and as Katsuki tucked himself back into his pants he found himself in disbelief. It was just a dream, right? He was gonna wake up in his bed covered in his own semen, it wouldn't be the first time. 

“Oh! And Kacchan?” Izuku called from the corridor.

“Huh?”

“Thanks for letting me blow off some steam! It really helped!”

“See you in the morning, nerdass.”

“Looking forward to it!”

Oh well. If it was really a dream, he'd just have to try it out next time.