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The instructor's older sister took my hand to exercise outside and came to the ground of the sports gym during the break. When I was surprised to see my sweaty body for the first time, he said, "It's exciting to be outside." Tits attack in the bath. And when I was stretching, I got on top of me and shook my hips, making my body look funny. When I discovered my father's erotic book and my pussy was itching, my sister told me to do "Sogo masturbation". Adults are too amazing, onee-chan...