In the dimly lit room, the siblings sit facing each other, legs spread wide. The brother's hand moves slowly, firmly up and down his length, his gaze fixed on his sister's fingers as they plunge in and out of her wetness. She mirrors his rhythm, her breath hitching as she watches him jack off. The air is thick with their shared desire, the scent of their arousal mingling. The brother's hand speeds up, his sister's fingers matching his pace. Their moans fill the room, a symphony of their taboo pleasure, until they both reach their peak, their bodies trembling with release.