A mysterious package arrives, revealing a strapon harness and dildo. Intrigued, the sister tries it on, feeling empowered by the weight of the silicone cock. She teases her brother, rubbing it against his ass, making him squirm. He's never seen her like this, dominant, in control. She orders him to strip, and he complies, his cock hard despite his nervousness. She pushes him onto the bed, spreading his legs, and slowly enters him, inch by inch, until he's filled completely. She fucks him hard, her hips slapping against his ass, their moans filling the room.