Alone in the bathroom, a man begins his daily routine, only to be interrupted by a knock. His sister, seeking refuge from their arguing parents, enters, catching him mid-shower. Awkwardly, they make small talk, but the tension is palpable. She notices his growing erection, and he sees her lingering gaze. Wordlessly, she starts massaging his shoulders, her touch gradually moving lower. He tenses, then relaxes as her soapy hands wrap around his throbbing cock. She strokes gently, building a rhythm, her breath hitching as he grows harder.