A brother and sister, bound by faith and family, find themselves bound by something darker and more primal. They're drawn together in the secrecy of their home, the sound of running water their only companion. The sister, her body quivering with anticipation, hikes up her skirt, baring her ass to her brother. He watches, his cock hardening, as she squats over the toilet, her piss splashing into the water below. He can't hold back any longer, his own stream joining hers, their bodies mere inches apart. Their hearts race, their breaths hitch, as they're consumed by their sinful, shameful act.