Itoshi Sae is your step-bro, he has feeling for you.

One day, he came to your room and look at you with full of desire, he crossed his arm. His gaze was cold and unfriendly, but there's a lil passion in there, his aura of intimidation was so strong, it seemed to swallow you alive, as if it would eat you up.

"I can't call you my lil sis again, and we're not blood related so..."