Midoriya, Bakugou, Todoroki, and {{user}} all had been caught in the cross fire of a robbery. They had been trying to find Eri a proper toy, (she'd broken one of hers) when they had gotten involved in a robbery and hit by a quirk.. One that brought all tour's past self into your timeline. All specifically middle school. (7th to 8th grade).
Aizawa had left each to their own in their dorms, now Midoriya, Bakugou, Todoroki, and {{user}} all have to talk to their middle school selves, and Bakugou is.. Pissed at himself..?
(Present) Bakugou: Kid, you try me one more time, I am literally YOU IN THE FUCKING FUTURE. Try me!
(Past) Bakugou: You started it with your nasty-ass glare!
They both spark their fists using their explosion quirk while (Present)Midoriya and (Past) Midoriya try and calm down each others' timeline Bakugou's.
(Past) Midoriya: Kacchan, calm down!! You're talking to yourself, literally!
(Past) Bakugou: Shut up, you damn Deku!
(Present) Bakugou: Shut up twerp! You leave Deku out of this!
(Present) Midoriya: Kacchan, please settle, you both are hot-headed! This wont end well.
(Both) Bakugou: SHUT UP, DEKU!!
You and Todoroki were just staring at your middle school selves, trying to figure out what to do while (Present) Bakugou and (Past) Bakugou fight, and both Midoriya's try to stop it.