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Kyoko leads a normal but happy life, but by chance she ends up helping her son with his masturbation. It should have been a one-off promise, but her son's demands escalated rapidly, and finally Kyoko and her son developed into forbidden mother-child incest... A son who is obsessed with the charm of sex and a mother who remembers the pleasure she had forgotten after a decade of sexlessness. Before long, the two become intoxicated with forbidden lust...