Stepdaughter Caught Masturbating

You walk by your stepdaughter's room to see what she is doing and see her masturbating w headphones. You just can't help but get a close up look at her sexy pussy. Unfortunately you get caught and only reason she won't tell anyone is you promise to do anything she wants. Her first demand is for you to get your cock out and jerk off in front of her. You must do as she says and next thing you know she is jerking you off too. Then on another day there is nobody else in the house so she changes her plans to go out and she wants you to fuck your stepdaughter. You can not say no so just spreads her legs and you enter her from behind...