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Two years ago, my father remarried a young man named Yuna, or rather, a man who was almost as old as himself. In the beginning, I had normal contact with Yuna-san as a family member, but this Yuna-san is actually a very sexy person, and her butt is especially erotic. Before long, I was completely worried about Yuna's body, and I couldn't help but worry about it. One day, when I saw Yuna-san's plump buttocks while she was wiping, I couldn't stand it anymore, so I did something like that...