I’m guessing she crossed normal boundaries with her own little brother and was then separated from him for said actions. Maybe that teddy bear she has was the only thing she has left from him.
Ima also guess her own parents, mother in particular, were either neglectful or abusive (maybe mostly to her little brother) so that’s why she has some warped views on what being a mother is. And is treating this kid as “loving” as she thinks her lil bro deserved.
OR
Heck, maybe something simple like her just being a p3do that abused her little bro. Lost interest when he grew up, and continues to be a p3do to this poor kid.
Welp that’s just a theory. A manga theory
