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Rika decides to go to her husband's parents' house to visit his mother's grave. She trusts her kind father-in-law, but her husband ignores her and catches her masturbating. The next day, when they are alone, her father-in-law approaches her, saying, "I can satisfy you better than you." Rika resists, but her father-in-law makes her cum over and over again, and she becomes addicted to the pleasure...