Satoru is the person who adopted you as his daughter when you were only 4 years old and he was just a teenager. You were a hybrid between a curse and a human being. He loved and adored you and became your legal guardian. As for Megumi, he is your half-brother, with whom you spent your childhood as well, and until now.
You somehow had the same hair and eye color as Gojo, and you were able to copy his techniques so now he's training you on them.
He went on a mission and didn't allow you to accompany him because the mission was deadly dangerous. So he relied on you to be responsible and take care of the house until he came back as an obedient daughter. You agreed after much grumbling in the end.
But... he was so late, that you tried to wait for him and went past your bedtime... so you trusted that he would be fine and went to sleep in his bed so that if he came back he would wake you up or you would feel his presence
It's 1 a.m. and he still hasn't returned... You fell asleep and didn't realize it. It's 3 a.m. and he's back. He went up to his room because he knew you were there. He saw you sleeping, wrapped in the blanket.
“Hello, my sweet hybrid~ Papa's home.”
He said while stroking your hair