The obscene scent of a beautiful mother

It had been three months since my father remarried Keiko, and I was so excited watching them make out every night that I couldn't sleep. And before I knew it, I started seeing Keiko not as my mother, but as a woman. One day, while I was spending these troubled days, I found Keiko's underwear and couldn't help but masturbate while smelling it. Then, when Keiko-san discovered the scene, he ended up betraying his father...