Kosuke stays at his friend Tetsuya’s house and meets Tetsuya’s mother, Rei. Her voluptuous body and defenseless closeness leave him unable to hide his arousal. Noticing his gaze and frustrated by her husband’s long business trip, Rei decides to have a taste of him. But Kosuke can ejaculate again and again without losing his stamina. At first Rei eagerly enjoys his tireless cock every day, until his bottomless sex drive pushes her body past its limit...