Prompt: Somehow, whether through Izuku blackmailing Shouta to do it or through a villain's quirk, Izuku and Shouta swap personalities for a day. A bit of a cliché yes, but I just want to see Shouta acting as Hyper as this version of Izuku.

This is from Ticker on AO3 so thank you for the prompt!

I tried. It's a bit rushed, but it gives an idea of what would happen...

Yeah, this is some cursed shit.

---

"Patchy, I need you to cut him off by the next block by eating him or something!" I command in my headset. Currently, Shouta and I are chasing down a villain that the other excuses of heroes could not get. The man is a low-ranked villain for fuck sakes!

Sometimes, I swear heroes are decreasing in intelligence over each generation.

I can't say shit when this is the same idiot who snuck in as an undercover stripper to a club. Before you ask, it did work. It's was hard to keep a knife in my g-string, especially when it's next to my pee-pee.

OFF-TOPIC, MOVING ON!

We have no idea on his quirk, but from what I see, it has to be some sort of mental quirk. Maybe he is quirkless if lady luck loves us enough.

Probably not.

Shouta swings above me with his capture weapon while Patchy flies on ahead. Within a minute, we hear a scream. We arrive to see the man had been knocked over by Patchy. Using my boosters, I fly at the man while retracting the electric batons. The man manages to dodge somehow, but I take advantage of it and burst forward. I turn on the electric armor, ready to bash into him. Of course, he barely dodges. I hear another pair of footsteps land on the ground, well-aware that it's Shouta here to help. I'm not worried about electrocuting him as Sho has electric-proof armor, so I try to ram the man again.

However, something unusual happens.

The man reaches out and grabs me, electrocuting himself, but then he touches Shouta. This is usually a dumbass move generally because he did knock out right after he did it. It's the after-effects.

It feels like the energy is sapped from me. This heavyweight crashes me into the ground and roll. I have to catch my breath. This isn't something that would wear me out so easily.

What is going on? What kind of quirk is this?

I look up to see Shouta having wrapped up the knocked out man, but he seems off. He looks at me, and I notice how his eyes are no longer droopy, but instead physically alert. His body language is straight, not sloppy. I take note of the small twitches in his hands, similar to how I twitch when I'm sitting still.

The first idea that comes to mind is an energy switch quirk. The man did touch us before he knocked out, so he did have physical contact. I don't know how that would benefit him. It was an illogical move on his part. There has to be more.

"You okay, dumbass?" I look at Shouta, who asked that. His tone is even higher-pitched compared to normal, like in a happier mood. It hits me like a ton of bricks. I need to test a theory.

"What's your opinion on Hizashi?" This question could have been anything, but I chose Hizashi as I firmly know his opinion there. Or, at least I thought I did.

"He's my sexy mother-fucker, and if you try to take him, I will beat you to the ground without hesitation. What kind of question is that? You ignored my question!" That confirms it.

Shouta and I switched personalities.

That explains the energy drainage. I think he is starting to realize the problem because he looks shocked at me.

"I'm fine. We switched personalities, so energy is included. Are you okay?" With first-time reluctance, I stand up.

"It feels like Zashi and I fucked for hours on end, and I'm still horny!" I sigh.

"Too much information."

"So you can talk about us being a top and bottom, but I can't talk about my sex life?" I don't bother to respond to that.

"Use your quirk on the guy." I'm hoping that when he erases the quirk factor, we go back to normal.

"Didn't work, Sherlock." I pinch between my eyes.

I mumble, "Patch, tell Detective that we finished the mission. Eraserhead, we're heading back to the dorms once he arrives. You're staying in my place tonight."

"Why would I sleep at your trash place?"

"In case you don't remember, your normal personality doesn't usually clean. With the switch, you acquired my germaphobia as well. My place is clean." Did some memories transfer as well?

"It better be, or I'm bleaching the whole place."

---

"Izuku, care to explain?" Hizashi asks as he watches his husband run around the dorm, cleaning the place like a maid.

I take a moment to consider my answer," The man's quirk is Personality Switch: through contact, he can switch two individual's personalities for 24 hours. What the Detective told me anyway. Shouta and I are switched, so he has my energy and an attitude problem while I have his."

"Wait, so will he do the same shit as you normally do?"

"Most likely worst. Unlike me, he's going to have trouble with impulse control. I have worked on resisting it. He hasn't."

"This is going to be a mess, huh?"

"Yeah. Don't expect him to sleep either. Meanwhile, I will be taking a nap."

"Wait, what about the classes? Sho can't go out there teaching like that, right?!"

"I mean, he can. However, I will take his position. Just let me rest before, please." I go lay down on the couch and go out like a light.

---

Maybe I shouldn't have woken up. I wake up to find Shouta chilling in his scarf that's hanging from the roof while playing 'Wrecking Ball' by Miley Cyrus. I groan. I'm not going to bother stopping him. If it keeps him busy, all power to him.

I quickly dress in my usual uniform and sluggishly make my way to class 1-A. However, luck is not on my side when Shouta ends up beside me while hopping each step.

"Time to obliterate those kids!" Shouta announces as we enter UA. From his announcement, everybody turns to face him while we walk to class.

Curiosity is going to bite the cat with this question, " How?"

"I'm going to fight all of them at the same time and see if they can defeat me! Probably not, but they need to be able to in order to get out of class!" I just realize that he lacks in volume control.

"Today is rescue practice."

"Fuck the schedule!" I guess I can let Shouta go off. I'll have to keep an eye out on him to make sure he doesn't accidentally kill the kids.

The situation was interesting to explain.

---

"Sho, you went too far," I announce while walking over the beaten students' bodies. With the energy boost, Shouta did not bother to hold back and was able to defeat them within five minutes. He got rid of his most dangerous target, Todoroki, since he can produce massive attacks, and went from there.

"I didn't kill them!" Of course, he thinks that.

"Half of them have broken bones. Recovery Girl is going to hate you."

"They should have defended themselves better."

"Recovery Girl is going to kill you."

"She can't." Yeah, I'm not saving him from that. Shouta can suffer by himself.

---

"Ecchi till I die all these lolis call me (senpai)!

Rubbing on her thighs she stay wet for her (senpai)!

Shawty so kawaii, and would - IZUKU, LET ME GO!"

Of all the songs Shouta could sing, he chose that one? That's the most extreme one he could have picked. I hacked his music player and took advantage of him singing to wrap him in my nunchucks. I drag him away from the cafeteria and lock him in the teacher's lounge for the rest of the day.

"Izuku, is that something you would do?" Nemuri asks out of curiosity.

"Something I would want to do, but I wouldn't do it."

"Your personality is everywhere." I shrug in response.

---

"Izuku, why is Shouta on the couch struggling to breathe? Is he okay?"

"He's fine, Hizashi. He still has my energy, but his body isn't adapted to running nonstop. I had to force him here."

"Like we do you?"

"Yes."

"STOP FLIRTING WITH MY MAN, IZUKU! THAT ASS IS MINE!" Shouta pants out loud.

"Note taken. Hizashi, watch him for a while. I need another nap," I mutter as I crash on the couch once more.

---

We ended up having to lock Shouta in his dorm for the rest of the time. He's too impulsive. He escaped twice, and the only reason we got him back is because of CAT. I left him some paperwork to do, and that has kept him quiet for a while. Whenever Shouta starts singing that stupid senpai song, I throw more paperwork at him.

I think he Shouta more done during those four hours he has done for the past year. It is impressive what energy can do for you.

---

FUCKING FINALLY, MY ENERGY AND ATTITUDE PROBLEM IS BACK! GOD DAMN, I DON'T REMEMBER BEING THAT PROBLEMATIC!

I slam the door open to see Shouta slumped at my desk, passed out because all the energy was ripped away from him like taking alcohol from an addict. I should make him suffer for making me suffer, but I decide to be kind and take him to his bedroom and lay him down. I don't touch anything as I leave because there's a god damn cat in his apartment.

I don't want fur or diseases from that thing.

I hope to whoever the fuck made that a thing that it never happens again.

That whole situation was cursed.