In the dimly lit family home, a brother and sister, both curious and horny, sneak into the bathroom for a steamy encounter. She, a raven-haired vixen with curves that won't quit, strips down and fingers her dripping pussy, moaning softly. He, a strapping lad with a thick, veiny cock, watches from the doorway, his eyes locked on her ass as it jiggles with each thrust of her fingers. They're soon lost in their own worlds, each pushing themselves towards orgasm, but they're interrupted by a knock at the door. They scramble to cover up, but it's too late; their secret is out.