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A fifty-year-old mother comes from her parents' home in Ishikawa Prefecture to her son's room in Tokyo.The mother's underwear is on display as she changes in her room, unprotected, as if she were at her parents' house. The son, who is curious about her big breasts and her ass, can't resist, and after a long time, the skinship between mother and son stirs up his sexual desire and he falls into a lewd state!