In the dimly lit hallway, a curious sister spots her brother's closed door, a sliver of light escaping. She inches closer, hearing hushed moans. Peeking in, she sees him, his cock in hand, stroking slowly. Her breath hitches as she watches, her own hand drifting between her legs. She backs away, heart pounding, but the sight is etched in her mind. Later, they meet in the kitchen, the air thick with tension. She leans in, whispering, "I saw you." His eyes widen, but he doesn't pull away as she presses her lips to his.