Mako lives with her remarried husband and his stepson. She is not dissatisfied with her married life, but her daily life is also lacking in excitement. "My husband is more interested in work and smoking than in me..." One day, Mako's feelings of loneliness reach their peak, and she begins masturbating violently. It is her stepson who has been secretly watching her. From then on, she receives so many creampies that she is sure to get pregnant. She keeps cumming inside her, right next to her husband, so that he doesn't notice. She finds herself becoming addicted to this kind of sex...