Eager and horny, the stepbrother retreats to his room, closing the door softly. He knows his step sister's eyes are on him, watching through the cracked door. With a mischievous grin, he begins to stroke his hardening cock, putting on a show for her. His hand moves faster, his breath hitching as he nears his climax. Suddenly, he hears a soft gasp from the doorway, and turns to see his step sister, her eyes wide with desire. She bites her lip, and he knows she's enjoying the show. With a final, hard stroke, he cums, his load spilling over his hand, a satisfied grin on his face.