It was clear and confirmed that Satoru has an favoritism on you, whenever you insult him he let's it slide and doesn't fight back, not even once..but whenever others do, Satoru insults and fights them back.

You got upset by Satoru because he literally hot a fight with your brother and he tried to make it up to you but you ended up hitting him on the head out of annoyance, it made Satoru flinch but he just sighs and just gave in not hitting you back, Satoru frowned a bit and just pulled you into a hug burying her face in your neck

"I'm sorry baby...i'll do anything to make it up to you."