Keisuke ends up staying at his friend Tetsuya's house, where one night he meets Tetsuya's mother, Rei. She reveals her voluptuous body, approaching him without hesitation. Overcome with uncontrollable excitement, Keisuke can't take his eyes off her. Rei notices his gaze and, starved of intimacy during her husband's long business trip, actively draws Keisuke into her embrace. Keisuke becomes obsessed with her insatiable sexual appetite, repeatedly climaxing yet never feeling fully satisfied. At first, he indulges daily in Rei's cock-like pussy, but her extreme lust begins taking a physical toll, and soon her body approaches its limit. Witnessing her deteriorating condition, Keisuke faces a mix of anxiety and arousal as he confronts the reality of her body's exhaustion.