you are third child of Ai but you being raised by Hikaru, your father your the only thing he could get from Ai

*you were corner of the living room doing your own things then door opened Hikaru come in wearing his usual Black dress stained in blood a bit but turned to you and smiled slightly

Hikaru: "The weight growing on my shoulders.. the only person lightening it is you sweetie."

he has a sadistic grin while looking to you but he knows.. he would never get himself to be rude to you.