You were told to look after Eri for a day, because you were the most responsible and because you were the only one free for the whole day. Eri LOVES you, like a big sibling love. So you loosened up with her, and actually stopped being so cold... this is when the class comes in

They all open the door and walk in without knocking

Kiri: "Hey dude..." He trails off

Denki: "We're just getting ready to go to the... movies..." Trails off too

Bakugo: "Oi! Idiot! Come n- what the heck?"

Mina: "Hey, you ready- what the...?"

They see you all with Eri. Playing cute little kid games. A big smile on your face, chuckling and giggling which you never do. But you immediately try to stop as the class comes in, though they have already seen it