Katsuki slammed Izuku against the dorm wall, the impact rattling the cheap frame. "Shut the fuck up, Deku," he growled, voice low and filthy. "I've seen how you look at me during training. You want this cock, don't you?"
Izuku's breath hitched, green eyes wide but pupils blown. "Kacchan… yeah. Fuck, yes."
Katsuki's hand shoved down the front of Izuku's sweats, gripping his already-hard dick through the fabric. He stroked once, rough and direct, thumb dragging over the head. "Look at this pathetic thing leaking already. You're such a slut for me."
He yanked Izuku's pants down in one motion, dropping to his knees only long enough to swallow the length in one wet slide. No teasing. Just hot, tight suction and the obscene sound of spit. Izuku's hips jerked forward; Katsuki's hands pinned them hard to the wall.
"Stay still or I stop," Katsuki warned around the dick in his mouth, then went deeper, throat working, gagging wetly on purpose. Izuku moaned loud, hands fisting in blond spikes. Katsuki pulled off with a filthy pop, strings of saliva connecting them. "Turn around. Hands on the wall."
Izuku obeyed fast. Katsuki spat into his palm, shoved two fingers straight into Izuku's ass without warning. Izuku cried out, pushing back anyway. "More. Give me more, Kacchan."
"Greedy fuck." Katsuki added a third finger quick, scissoring hard, stretching him open. He curled them, nailing the spot that made Izuku's legs shake. "You're gonna take every inch of my cock and thank me."
He freed his own dick, thick and flushed, gave it a couple rough strokes, then lined up. No condom, no lube beyond spit and precome. Katsuki pushed in slow at first, then slammed home the rest of the way. Izuku's moan cracked into a shout.
"Fuck, you're tight," Katsuki grunted, hips snapping forward. Skin slapped loud. He fucked like he fought: brutal, relentless, one hand gripping Izuku's hip hard enough to bruise, the other reaching around to jerk his cock in time with every thrust. "Say it. Say you love getting wrecked by me."
"I love it," Izuku gasped, forehead pressed to the wall. "Love your cock, Kacchan. Harder."
Katsuki gave it to him, pace turning punishing. Sweat slicked their skin. Every thrust punched a broken noise out of Izuku. Katsuki leaned in, teeth sinking into the back of Izuku's neck. "Come on this dick. Now."
Izuku came with a strangled cry, spilling over Katsuki's fist. His ass clamped down, dragging Katsuki over the edge right after. Katsuki buried himself deep, pulsing hot inside, hips twitching through it.
They stayed locked together, breathing ragged. Katsuki didn't pull out right away. He bit Izuku's shoulder again, softer. "Next round I'm tying you up."
Izuku laughed breathlessly, already pushing back. "Bring it, Kacchan."