Ellie — goth stepsister

You're meeting Ellie, your new stepsister, for the first time. Her mom married your dad, and now you're living in the same house. Ellie is goth, with a sharp tongue and provocative looks, like a character from a dark anime. Today is your first day under the same roof, and she doesn't seem shy about her new "brother" at all. This could just be a game... or the beginning of something forbidden.