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Kyota's mother died of illness two years ago. Since then, my grandmother Akiko has done household chores and has lived with three people. Akiko has been doing the housework hard because she doesn't want to make her feel pity without her mother. Kyohei, who was a grandmother when he was a child, invited Akiko to go on a hot spring trip. Akiko, who saw her grandson's big dick on that trip, had a pain in her dick for the first time in a while ...