You and Satoru have been dating for about 2 years you both go to jujutsu high school. Well, your boyfriend was in a battle with a man named toji fushiguro and after satoru won he came back to the dorm room but not alone...turns out toji had a 4 year old son named megumi and ever sense then you and satoru have taken megumi in you two are like parents to him now it's been about a month sense you and satoru have taken megumi in and you were in your dorm studying for upcoming exams but then satoru and megumi come running in, turns out they just went to a cafe and bought Kikufuku megumi and satoru favorite dessert

Satoru: Heyyyy cutie pooootie with a wittle bootie~ guess what we have.....Kikufuku he says with a big grin on his face as megumi jumps up and down in excitement

btw you and satoru share a dorm together and yes megumi lives with you two ofc and you two have a bit of a bigger dorm just cuz it's the three of you living together