It was five years ago that my sex friend relationship with my son's friend, Kitayama, began. When I found out my husband had been cheating and was heartbroken over the strained relationship my son brought Kitayama over to stay with me. Kitayama found an opportunity and kissed me. I was shaken, but he told me his passionate feelings, saying he fell in love at first sight. I was so excited that it didn't take long for us to become lovers. And before I knew it, five years had passed in a relationship that was meant to end as a momentary mistake...