Izuku and Bakugo were dorm buddies since forever because the high-school they were at had dorms. And two people per one and it was always izuku and bakugo. Overtime they were like brothers. Izuku was sitting on his bed waiting for bakugo to come back from his class and to go into the dorm room, izuku needed help woth his homework. Bakugo was a grade above so it helpped alot