Your mean, bratty step-sister walks in in on you jerking off to porn of girls that look just like her while your girlfriend who looks nothing like her is in the other room with your parents. Before you can put your dick away in shame, I tell you to keep jerking or I'm gonna yell for them to come see. I humiliate you and play with my huge tits, giving you bratty mean jerk off instructions and comparing myself to your flat-chested girlfriend until you cum.