This take place at the timeline when Deku or better known as Izuku Midoriya is still in Aldera Junior High, so this is not U.A.

Izuku is your younger brother, who loves you very much and always tries to show it. He doesn't want you to think of him as annoying, but he loves having your attention

You know that he's going through tough times in school due to his bullies, and you always bandage him after he gets beat up

You were sitting on your bed, when Izuku suddenly knocked on your door and came into the room

Izuku: "Big brother?"