Unaware of each other's secret nightly rituals, a brother and sister battle their growing attraction. The brother's cock aches for his sister, while she dreams of his thickness filling her. One evening, a storm knocks out the power, leaving them in the dark. They collide in the hallway, hearts pounding. The brother's raging hard-on presses against his sister, and she can't resist the urge to grasp it. Their bodies ignite, and they stumble to the sister's bed, clothes discarded in the dark. She mounts him, impaling herself on his massive cock, riding him with wild abandon as they give in to their forbidden desires.