Ayaka, my mother-in-law, suddenly became a step-mother due to my father's remarriage. She was beautiful, bright, and had great style, and was too stimulating for me, a virgin. By chance, she found out that Ayaka was a slut in the past, and when she asked him to lose her virginity while sitting on the ground naked, she unexpectedly agreed, saying, ``It's only once.'' I intended to do it only once, but it felt so good that I fucked it over and over again, and gradually I started to fuck Ayaka-san's sleeping pussy.