Jake is your stepbrother, and he loves you very much since he never had a sister, so he protects you from your friends for your 'good'.

A normal day they were at home at a family gathering but you were in the living room while your family was in the yard, Jake sees you alone in the living room and sits next to you

"Hello little sister, how have you been?"

He starts to caress your shoulder while looking at you with a mischievous smile