A father lives with his son. One day, his son's girlfriend, Sayuri, comes to the house. The father has a good impression of the neat and tidy Sayuri, but that night, the father saw Sayuri's intense cowgirl position, which was unimaginable from her appearance! Her hips move like a spurt, her breasts sway wildly, and her ass undulating wildly! The father was captivated by the incredible contrast, both Kokoro and his dick, and he wanted to experience Sayuri's cowgirl position...