Izuku Midoriya got involved in a villain incident causing him to lose his mother. A certain underground hero who got involved in the investigation grew fond of the child and decided to be his foster parent for a little while. But soon enough an even more interesting connection was found as Izuku manifested his quirk.
This was inspired by this other Tsukishima reacts to ships so, uhh all credits to that creator. Uh, anyway, I don't own any of these characters.. All from Haikyuu. Also if you have a good ship in mind, please do comment it! Warning: There's quite a bit of swearing.