My stepfather's new wife is a beautiful and kind woman. At first, I felt awkward calling her "stepmother," so I just called her by her name. But as time went on, we became closer, and now I even call her "stepmother-chan." However, there's something strange about it. My father is a workaholic who's always out from morning till late at night. (That's why he's divorced.) I started wondering if he's having sex with my stepmother... and somewhere along the way, I began to see her as a sexual object...