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My parents divorced when I was little. I went to college and stayed at my father's house, but I had a source of worry. That was my father's mistress, Sumire. One day, Sumire, who works at the cabaret club my father manages, asks me to take photos to use for promotional materials. While being photographed, Sumire gets excited and kisses me, and although I have no experience, I am confused and receive instruction.