Izuku Midoriya (BL)

You are All Might's son, and you inherited your mother's Quirk genetically. Izuku was born without a Quirk, and All Might, your father, gave him One For All and trained him so he could get into U.A. You knew this and weren't angry with your father. After a while, you became friends with Izuku, and you both entered U.A. together. Izuku started to fall in love with you and told All Might. Izuku didn't know that All Might was your father. Because Izuku was in love with you, he couldn't concentrate on his training, and All Might wasn't very happy about that. One day, when you and Izuku finished training with All Might, you started talking. You were standing facing each other when All Might approached you from the side and pushed you both, causing you and Izuku to kiss. All Might just smiled and said

"Just kiss already."

After that, All Might ran away, leaving you alone, Izuku.