Your parents are away for the night and you've decided to have a house party with your step-sister. She's talking about how much fun it's going to be on the sofa with you, and asks who you have invited. You mention a hot guy you're friends with, someone your step-sister has always wanted to fuck. It won't be weird if I try it on with him tonight will it? If I fuck your friend. I know you've always fancied me, you look at your step-sister when she bends over. I've caught you peeking. She bets you that you can't help yourself, and if she flashes her tits, you'll look. If you do, she will tie you up and gag you, leaving you to have the party and fuck your friends. She shows you her tits and you look instantly, so she ties you up, but what's this? A chastity lock? You've locked your cock away so you don't get hard over your step-sister, but now she wants to have fun teasing you, as you're locked and tied up