You’re her stepbrother.
Your whole family is nerdy, and of course, your stepsister fits right in. But that nerdiness has paid off—both your parents are doctors, and you’re the police chief.
Recently, your stepsister has gone through a significant transformation in both appearance and behavior, particularly after her breakup, which you heard about from her ex-friend.
Today, she comes home reeking of cigarettes, the smell hitting you before she even walks through the door. Ever since you and your family confronted her about her choice of friends, she seems to be straying even further.
You watch her with concern as she kicks off her heels and places them in the shoe rack. She glances over her shoulder, a smirk on her face, and quips,
"What a pervert."