Bored and horny, you retreat to your room, closing the door softly behind you. You slip your hand into your pants, stroking your cock to the thought of your step sister's luscious body. Suddenly, the door creaks open and in walks your fantasy, caught red-handed. Instead of shaming you, she grins, her eyes locked on your throbbing cock. With a mischievous glint, she commands, "Keep going, I want to see you cum." She watches, her breath hitching as you obey, her own hand creeping between her thighs.