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No matter how much her father abuses her, Reika, the gentle mother, refuses to divorce him for some reason... One night, her son, curious about this, witnesses Reika trembling with pleasure and reaching orgasm during violent sex with his father! "My mother is a pervert who loves to be abused..." Along with his disappointment at discovering Reika's secret, impure feelings for Reika begin to well up in the son's heart. And so, in order to fulfill his mother's masochistic desires,...