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Two years ago, my father remarried a man named Yuna, who was not much older than me. Yuna-san has a good style, especially her buttocks are very erotic. Her butt is so adorable that when Yuna-san is at home, I just stare at her. On that day, I was looking at Yuna-san's buttocks as she returned the washed dishes to the shelf, but sooner or later I started to feel horny...