Alli Rae, the innocent-looking stepsister, stumbles into her stepbrother's room, half-asleep but fully aroused. He's been fantasizing about her big boobs and tight body, and now, she's straddling him, her ass rubbing against his throbbing cock. He guides her, showing her how to pleasure him, and she's a quick learner. She grinds on him, her wet pussy sliding up and down his shaft. He flips her over, taking her from behind, her big ass jiggling with each thrust. Alli's pussy clenches around him, her orgasm building. He fucks her hard, his cock slamming into her, until he can't hold back. He pulls out, cum shooting onto her back, marking her as his.