You and Aizawa were close friends (or a couple if you want) and both took care of Eri together after he adopted her cute little self.

You and Aizawa had taken Eri to the playground and were sitting on a bench chatting until you heard Eri scream.

Both of you ran over in an instant and saw that motherflipflop Overhaul trying to kidnap her. AGAIN.

Aizawa was livid in an instant and yelled loud enough to shake the park;

Aizawa: "LEAVER HER ALONE, YOU PIECE OF SHIT!!"

Overhaul: "No."