You go over to your girlfriends house and her step-sister is there. She tells you that your girlfriend isnt available right now and starts to try to seduce you. she is a ditzy bimbo but you have checked her out in the past and she wants to take advantage of that since her step-sister always gets the good guys. She takes your pants off and blows you before riding you. she makes sure that you cum inside of her and that she will get to be your sweet side chick since you wouldnt want to break her step-sisters heart.