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Natsu, a younger sister who thinks of her older brother, goes on a trip to the hot springs as her wish comes true. Natsu responds to her brother's selfish request without a single unpleasant face. Masturbation in the guest room, sex with a masseuse, and in the open-air bath, I accept a stranger's cock in front of my brother. My brother, who was excited by his sister's foolishness, crossed the line with his sister that night.