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Her husband has been away on a business trip, leaving her father-in-law behind for a long time. Ai feels increasingly lonely and masturbates to soothe her sorrows, but her father-in-law sees her doing so. The next day, her father-in-law attacks her, claiming to feel sympathy. Ai resists, but her body is overcome with a strange sensation of being satisfied. She then begins to desire her father-in-law, who has a strong sexual appetite.