Chapter Text
{ Izuku.
He didn’t remember much from the fight. Only that he had blacked out after the villain he and Kacchan had been fighting shone some nausea-inducing beam at both of them, and he briefly remembered visiting Recovery Girl, but not much else.
Izuku had woken up in his bed— wait, no. As he came to, he realized that he was in Kacchan’s room. Yeah, he was definitely in there. He didn’t see his usual All Might-clad walls.
Why the hell was he in Kacchan’s room?
He rubbed his eyes. Had their rooms been mixed up? Izuku sat up, stretching. He winced at the pain in his ribs; he must had been knocked out in the fight. Holding a hand to his flank, he realized something.
His body felt different.
Izuku stood up as soon as he caught a glimpse of himself in Kacchan’s body-length mirror. His mouth fell open in a gape.
That was Kacchan looking back at him. There was no doubt about it.
The mussed-up, spiky blonde hair, the crimson of his slanted eyes, the roughness of his palms. Izuku was looking straight at the reflection of Katsuki Bakugo. But.. how? He scoured his memory. That villain must have had some sort of body-swapping quirk. Shit.
Wait.
If Izuku was in Kacchan’s body, did that mean Kacchan was in Izuku’s? Oh no. He needed to tell Kacchan about this immediately. He pat down the blonde mess that was Kacchan’s hair and quickly slipped on some sandals.
{ Katsuki.
As soon as he had woken up, he had realized something was seriously wrong. It didn’t take him too long to realize what was wrong, thanks to how different Deku’s body and room were. It was real, not a dream. Katsuki was definitely in the nerd’s body.
He felt a heat on his face as he looked down at his new form. This was so fucking embarrassing! Of course he had to be stuck as the shitty nerd! Katsuki scowled, which looked strange on Izuku’s face. He had to get a hold of Deku.
Katsuki was about to open the dorm’s door when a discreet knocking was heard. It was probably Deku. Katsuki opened the door to let him in, a strange feeling washing over as he looked at himself. This was so weird. Katsuki closed the door as Deku entered.
“Kacchan—” Izuku started.
“Shut up! That nickname sounds so weird in my voice! What the fuck is going on? Did you do this?!” Katsuki whisper-yelled.
Deku shook his head nervously. “No, I swear! I’m pretty sure it was that guy we were fighting! The last thing I remember was being knocked out…”
Katsuki groaned, pulling at his now-green hair. “What the hell… how are we going to get back to our bodies?”
“We should tell Recovery Girl! She—”
“Shut. The fuck. Up. We are not telling her about this. No one is going to know about this, okay?” Katsuki seethed, glaring at his body.
“…” Izuku pondered for a moment. “Why not? We literally have no reason not to, Kacchan. This isn’t something we should stay quiet about.”
Katsuki grabbed Deku by his collar, bringing him down to eye-level. The sight was a strange one in the context of their swapped bodies. “No!” he hissed. “I don’t want anyone to know. If Recovery Girl knows, Nezu knows. If Nezu knows, the faculty knows. If the faculty knows, Aizawa knows. You think I have time to get some dumb lecture about being safer from Aizawa right now?”
Deku thought about it, “No. You’re… Okay. You’re right. Let’s not tell anyone.”
Katsuki sighed dramatically, letting go of Deku’s collar. “Fucking finally. Now, let’s figure this out. We… need to act like each other when we’re in public.” Katsuki cringed.
“Oh, yeah.”
{ Izuku.
After that, he and Kacchan had just discussed their habits, mannerisms, and anything else needed to act like each other. Kacchan had said he needed to work on some assignments, so they had silently gone to their original rooms.
Now, Izuku in Kacchan’s body was in Izuku’s room. Nothing he hadn’t seen before; he lived in this room. Somehow, it felt different.
And weird.
Kacchan’s body was definitely quick to react. When Izuku had been stressing earlier, he felt his palms start sweating. And now, the bundle of nerves he housed in his stomach for no apparent reason were causing more physical sensations.
Izuku realized Kacchan’s body needed to pee.
He had been avoiding it, but his full bladder was too noticeable to ignore now. Izuku got up from his spot on the carpet, closing the door to his single bathroom. He stood in front of the toilet for a while.
Eventually, he decided he was just going to have to suck it up. He raised the seat and slowly pushed down Kacchan’s baggy pajama pants to reveal his boxers underneath. The fabric was straining.
Kacchan’s body not only needed to piss, it had an erection.
Izuku blushed hard. He let out a quick breath and pulled down the boxers, looking up at the corner of the ceiling to distract himself as he finally released the contents of his bladder. He was anxious when he saw the erection hadn’t gone down at all.
Well, of course. Kacchan’s body didn’t have an erection because he had to piss.
Izuku glanced down at his length. It was about 16 centimeters, cut, and had prominent veins. He closed his eyes.
What are you doing, Izuku?
Well, it was starting to hurt. He had to get rid of it somehow, right? And… Izuku had more often than not been attracted to Kacchan’s body.
Fine. He would do it. He flushed the toilet, washed his hands, and flopped onto his bed, all while not bothering to pull his pants back up to avoid more sensitivity.
Izuku breathed out. Looked down at Kacchan’s dick. Slowly, tentatively, wrapped a hand around it. Fuck, it was sensitive. Izuku began to slide his hand up and down along the shaft, letting out small, sharp breaths of air. His fingers brushed against the glans; he let out an involuntary whimper.
Hearing that whimper in Kacchan’s voice awakened something in Izuku. He became more self aware now: here he was, in Kacchan’s body, jerking off. That was…
So hot.
Izuku continued to indulge himself, letting out soft noises at every other stroke. He rolled the tip of his finger around the slit, whining as he touched precum. He continued, stroking the substance along the length as lube.
“Mmhh.. Kacchan.. your body feels so good..”
God, he felt like such a pervert. Was he even allowed to do this? Izuku couldn’t tell through the haze of his lust. His hips bucked upwards against his hand. As he pumped, his other hand stroked through Kacchan’s blonde pubes. “Ah…”
Izuku fucked into his hand like an animal in heat. He hadn’t been so turned on in ages, and it wasn’t even his body! Moans and more whimpering spilled out of him as he immersed himself in sensation.
“D-Deku… you’re so fucking cute.. nn..” Izuku moaned to himself in Kacchan’s voice. “Fuck, you’re so.. so.. so pretty.. hahh..” His words regressed to mumbles and whines, as he was stroking so fast now.
“Nn..! Gonna.. gonna cum, gonna—” Izuku let out a wail as he completely let himself go, thick spurts of semen collecting on his stomach. He rode the waves of his orgasm until he was shaking, weak, and about to pass out.
Izuku panted, sweating, lying there for a while. He really had just done that… and loved every second. He definitely could not tell Kacchan. Feelings of shame and guilt mixed in with his leftover euphoria as he cleaned up. What had he done?
More importantly, what would Kacchan think of this?