Ever since you started dating your new girlfriend, your stepsister's been a total butt to you. She never lets you play her Xbox anymore. When her aggravation at you finally hits critical mass, she confesses she's jealous of your girlfriend! When you admit you're into her too, she breaks up with your girlfriend for you then and there, and proceeds to get you naked, dominate you, and jerk off with you—with a promise of naughtier things to come. Since you obey so well, she even lets you taste her cum! Gooood boy.