My step-sister and I share a secret. We're both horny, and we both know it. One day, I can't take it anymore. I sneak into the bathroom, locking the door behind me. As I start to stroke my aching cock, I hear the door handle jiggle. Panicked, I freeze, but it's too late. My step-sis slips inside, her eyes widening as she takes in the scene. Instead of leaving, she watches, her breath hitching. I can't stop now. She steps closer, her hand reaching out, compelled to touch.