I was born into a broken family and grew up with my grandmother, so I have always longed to live with my mother. That's why I have always been envious of Yuta. Even though Yuta's parents are divorced, he still gets to live with his mother. His mother is a very beautiful and alluring woman. The closer I am to her, the more I desire her. I accidentally saw Hikari-san masturbating in the bathtub, her large round breasts, fair skin, and blissful face as she was about to climax instantly aroused me. I started masturbating right outside but unfortunately she caught me. Unable to control myself, I made her help me finish the job. Since then, I have felt very embarrassed to meet her again, so I can only watch her from a distance. Once she got sick, and since Yuta was studying at a university in Tokyo, I went to visit her. Being close to her awakened the beast within me. I couldn't control myself and ended up having sex with my best friend's mother. And after that, we continued to have sex with each other time and time again. At first, she rejected me, but gradually she began to accept me, allowing me to become her other half...