You come into my room and I know exactly what you want. You're my pervy step-brother and I know you all too well, you've always been obsessed with my butt crack. I tell you that this is the last time you'll be jerking off to my buttcrack for free and next time you'll be paying me if you want to see it. You agree and I begin teasing you, showing off my buttcrack to you as I tell you to worship my perfect asscrack and jerk your cock to it!