Katsuki wakes up at night to find Izuku out late training, which annoys and worries him. Obviously he won't admit ever that he was worried though. Despite his stubbornness, he goes to check what's up with him, because of course he does.. And maybe gets a little closer to him in the process.. Set post season 6, so Izuku went vigilante after the first war and has been brought back , but All for One, Shigaraki and the rest of the league have not yet been defeated in this timeline