Izuku and Eri swap roles.

"My name is Eri Midoriya, and I'm going to be the number one hero someday. My first official mission as a licensed hero ^in ^training ? A boy by the name of Izuku is being held captive by Overhaul. Apparently, Overhaul is experimenting on Izuku, to create a drug that will awaken the inactive quirk factor in quirkless people, so he can create mass chaos. It's my job to rescue him."

"Uh, Eri? Who are you talking to?" Mirio asked.

"Mirio! I didn't see you there. Uh, I'm not talking to anyone. Just talking to myself."

"Well get your head in the game. We're leaving for the raid now."

"Right." Eri put on her hero outfit, becoming Rewind Girl. She ran up to All Might, who helped train her and get her ready for UA. She never would have made it without that training. And in return, she had healed him of his grievous injury.

"You ready, young Midoriya." All Might asked. Rewind Girl just pointed to her mask. "Oh! Right. Rewind Girl. My how far you have come. Makes me proud."

"Thank you All Might. And yes, I'm ready.

Later.

All Might had used his immense strength to rush ahead of the group. He was struggling to fight against Overhaul, but was ultimately winning, so Overhaul did something that shocked everyone. He fired one of his quirk activating bullets at Izuku. From what the raiders had seen so far, those affected by the drug inside those bullets would gain highly destructive and uncontrollable quirks, that would threaten the lives of even the one who gained it. All Might ran in, and shielded Izuku, taking the bullet, and more importantly, the drug, himself.

Rewind Girl just made it there in time to see All Might get hit. "No."

"Damn. I would have loved to use one of those on you, but unfortunately, I didn't reach the point of getting them to work on those who already have quirks."

"Aaah!" All Might screamed in pain, as he started mutating.

"What the hell? Don't you have a quirk already?"

Rewind Girl knew the truth. All Might had offered to give his quirk to her. One that he received from his master, but she declined, saying she would take it only if there were no other options. But before he got One For All, he was quirkless, so he was liable to be affected by the quirk activating drug.

"This is bad. I have to get to him and rewind him before it's too late." Rewind Girl tried approaching, but All Might had finished mutating, into a giant with a misshapen head. And he ran straight at her. She barely dodged in time, and where she once was was now a crater. "Damn it. Looks like I'll have to go all out." Rewind Girl snapped off her horn. This would effectively make her quirkless for a few months, but it also caused her quirk to become much stronger. She unleashed the energy, healing All Might in the process.

"Mid- I mean Rewind Girl? You broke your horn? But that'll put you out of commission for awhile." All Might spoke, shocked.

"It was the only way. Now finish this fight. I'll take Izuku out of here."

"Right!"

---

So I just had this idea randomly and had to write this. Anyone is free to use it if they want, same with all my prompts, as long as you let me know so I can read the fic.