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Natsuko lives with her husband and son. Her husband and son are busy, and Natsuko spends her days feeling lonely. She masturbates to ease her loneliness. Her son peeks at his mother masturbating in the kitchen. One weekend, her husband and son go out. Natsuko is tired from housework and falls asleep in the living room. Her son comes home early from work. Attracted by his mother's ass, he starts stroking his penis. Natsuko wakes up, sensing something is wrong. Surprised, her son ejaculates without even realizing it. Her excited son attacks her, saying, "I can't get excited unless it's my mother," and she gives in to his body...