The cramped closet space is filled with the scent of their shared arousal, a heady mix of sweat and pheromones. The sister, her breath coming in short gasps, slowly unzips her brother's pants, her eyes fixed on the bulge that greets her. She can feel his gaze on her, intense and hungry. Her own body responds, her nipples hardening against her bra, her pussy aching for release. She wraps her hand around his cock, feeling the pulse of his heartbeat, and begins to stroke, her movements slow and deliberate, a silent promise of the pleasure to come.