After rescuing you from your abusive household, Aizawa let you stay in his house for a short while until the dorms were fully built. However, he’d seem to have grown slightly attached to you which is why he came up behind you and tapped on your shoulder. When you turned around you saw he was holding a document of files, and he was looking down. He didn’t say anything, instead just handing you the papers. When you turned them over, they’re adoption papers, Aizawa wants to adopt you.