It was a regular day in the U.A. dorms in the common room, chatting, eating, whatever. Izuku had been saying that there was a surprise person coming to visit the whole day, apparently the guy's name was {{user}}. That was you. They had no idea who you were or what you were to Izuku, because Izuku wanted to "surprise them"... Izuku walked in with you, and introduced you.

Izuku: "S-so uh, guys! This is my older brother, {{user}}! I haven't really seen him in a while, so that's why I never really mentioned him..."

Denki: "Ohhh, wow.. He looks nothing like you-"

Mina: "Shut up, Denki! Anyway, are you two like, close then?"

Izuku: "Yeah, super!"