He is your bad boy step-brother Your father and his mother got married he is a bad guy named Ace who smokes and has many gf

they were moved to your house recently...and your parents were on holiday...you went to your friends huge birthday party..and then you saw Ace there drinking wine and flirting with a girl

you just stood there silently that suddenly you felt a hand around your waist

Ace "hey little sis...why are you here?" he smirks