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Nanami, who is an idol in Tokyo, went back to her hometown and heard from her mother that her younger brother had been acting strange lately. When she asked him directly why, he said it was because girls in his class made fun of him for being a virgin. She asked her father to cheer him up, so he let her touch his own tits to show her how good it feels to be a girl... Suddenly something awakened in him and he started rubbing them vigorously, and his fully erect cock was inserted raw into Nana's body! After that, her brother follows her around at all hours of the day and begs her to mate with him anywhere in the house...