You've always been a lowly loser. Your sis has never hesitated to to make that clear. You couldn't believe your lucky stars when you managed get a girlfriend, and after dating for a while, you're pretty sure you're going to lose your virginity to her. Of course, not if sis has anything to say about it. You've always had a pervy crush on her and she's always used that to her advantage; manipulating you to do exactly what she wants. She confronts you one day with your diary in her hand. She knows all about your plans to lose your v-card and is determined to sabotage it. She gives you an ultimatum; you can go on your little fuck date with your homely girlfriend, or you could sit here and jerk your cock as she teases and encourages you. Her sexy body and seductive words are simply too much to resist and you pull out your prick and begin stroke. She seduces you toward the greatest orgasm of your life with her sexy full lips and soft round ass. As you lie there in a puddle of your own sperm and regret; she pulls out the chastity belt. How can she trust you to keep your end of the bargain without totally taking control of your cock? You try to stand up for yourself, refusing to go along. But that's when she reminds you of your diary; if you want her to keep her lips sealed about the contents, including all the sick entries about how you lust over your own sister, you better get in the cage. You're left with no choice. Your sister has complete control of your sex life; or rather, lack there of. Now you have to find ways to dodge your girlfriends advances and live in complete obedience toward your sister for who knows how long.