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My mother-in-law, Ayaka, suddenly became a stepmother when my father remarried. She was beautiful, bright, and had great style, and was too stimulating for me as a virgin. By chance, I found out that Ayaka was a slut in the past, and when I asked her to lose her virginity by sitting on the ground naked, she surprisingly said, ``It's only once.'' I intended to do it only once, but it felt so good that I fucked her over and over again, and gradually Ayaka's dormant slut instincts awakened and she became completely masturbated.