In the dim light of the closet, Klause81's hand moves feverishly up and down his engorged cock, his moans barely contained. Suddenly, the door creaks open, and his stepsister stands there, her eyes widening as she takes in the sight of his naked, aroused form. Instead of leaving, she steps in, her gaze hungry. She leans in, her breath hot on his ear, "Let me help with that," she whispers, her hand replacing his, guiding him to the edge of ecstasy.