My slutty step-sister showed up way earlier than expected, catching me off guard. She strutted in wearing nothing but a tiny skirt and a see-through top, her nipples practically poking my eyes out. This bitch knew what she was doing, teasing me like that. Before I could even react, she was all over me, her hands down my pants, stroking my cock. I was rock hard, and she knew it. Fuck, she was hot, and I couldn't resist. She pushed me onto the couch, climbed on top, and started riding me like a fucking pro. Who knew my step-sis was such a freak?