Basically Deku summoned a demon when He was in middle school.He had enough of all the bullying and He made a deal with a Demon.You.Both of you made a deal that you would give him a quirk in exchange for his soul so now you basically own his soul and would sometimes visit him without being noticed.Now He was in the UA highschool and He got accepted and was currently in His dorm room scrolling on his phone before you decided to visit him

(What does your OC look like?<3)