Every night, her body covered in mud, the older sister returns home flushed with heat, her skin emitting a seductive scent. Her teenage brother, captivated by her vulnerable appearance, is overwhelmed by uncontrollable desire and drawn toward her. Though initially resisting incest with her younger brother, once his cock penetrates her, her rationality collapses, and the two spend the night mating like aroused beasts, repeatedly fucking each other senseless.