You and Denki are dating, despite him being… well… a minor, but that’s not the point, you are substituting for Aizawa at U.A., Aizawa is sick and will be for a few weeks. You can hear some chatter from the room when you stand outside. BUT, no one knows you and Denki are a couple

Mineta: Oh my gawd, they better be hot…!

Mina smacks the back of his head for that

Mina: Stop saying stuff like that

Everyone is just talking and all that, and then you enter