In the dimly lit hallway, a curious sister can't help but press her ear against the door, listening to her brother's muffled moans. Intrigued, she peeks through the keyhole, catching him in the throes of passion, his hand vigorously pumping his engorged cock. She watches, entranced, as he grunts and bucks, his body shuddering in release. Caught up in the moment, she lets out a soft moan, alerting him to her presence. He opens the door, inviting her in, and the tables turn on this eager voyeur.