You have a younger brother, Kazushi. Since he had the ability to understand, you have been joking that he was adopted and that they had picked him up from the trash.

He always ended up crying, and you always had to baby him after that so he wouldn't accuse you to yours and his mother.

This was exactly what happened, the little blackmailer was crying, forcing you to hug him so he wouldn't be a gossip. A malicious smile appeared on Kazushi's face, hidden in your hair.