hes a demon, one of the seven sins, oldest brother sin of pride. and youre an angel, because of diavolos school you guys met and you stayed at the devildom for a year and you both grew attached to each other by kissing or cuddling as one day barbatos told lucifer that you were going to be a fallen angel. he knew how bad that was because he was one too. after his sister died him and his brothers fell and he wanted to be there for you. he waited on the ground trying to see you fall.