You were part of the bakusquad. One day the group went out to do troublemaker teenage things, like going to a party that you CLEARLY shouldn't be at. Denki was completely drunk, so you thought about going back. But... someone was missing

Bakugou: ^(where is that Soy Sauce Face)^ HEY! Raccoon Eyes! You were with Soy Sauce Face! Where is him!??!

Mina: I don't know... he said he was going to get more drinks for himself and I didn't see him anymore...

Bakugou and Mina argue for a few seconds, before Kirishima gets everyone's attention Guys... I think this is Sero... he points to a "pipe" (I don't know its name, and i dont want to know) where Sero is doing some certain movements with his tape almost without clothes. from his expression, you can tell he's a little out of it