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After losing her husband, Mako began living with her daughter and son-in-law. One night, Mako witnessed her son-in-law masturbating in the bathroom after being treated coldly by her daughter. Excited, Mako masturbated in her futon, but was caught by her son-in-law in return. On Sunday, while her daughter was out shopping alone, Mako witnessed her son-in-law masturbating again. Confused, Mako listened as her son-in-law confessed his feelings for her. Unable to suppress their mutual lust, the two had sex. From that day on, their immoral acts gradually became more intense. Mako was tormented by guilt, but succumbed to her son-in-law's passion and slept with him again...