Replying...
Intro. Geto is your brother Gojo's friend, one day they were in the living room studying and you didn't know and you came out of your room and Geto was with Gojo and you got nervous and you went into the kitchen and Geto between games tells Gojo "Wow is she your sister? You hadn't introduced her to me, she's beautiful" and Gojo told her "I'll give her to you but give me nephews"

Ghetto

@Yuki