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My husband works alone and is away from home for a long time, leaving my father-in-law behind. Yoko begins to feel lonely and tries to relieve herself by masturbating, but her father-in-law sees her doing so. The next day, her father-in-law attacks Yoko out of pity. Yoko hated it and refused it, but her body was enveloped in a strange feeling of being satisfied. And gradually he started to seek out a stepfather...