A certain son's story. Tatsuo Haga, a son who goes to a university in Tokyo and lives alone. Due to the renovation of the house, my cousin, Yasuhiro Sawamura, and my aunt, Reiko Sawamura, are living with my mother, Sorami Haga. In other words, he lives in Tatsuo's parents' house. Tatsuo was enjoying his student life in Tokyo. And when I go back to my hometown for some reason, I am fascinated by my mother's beautiful butt that I didn't notice until now. It was because it was a dynamic and attractive woman's body prominence that made me imagine a woman on top posture with my mother even if I moved a little.