A relationship that must never be discovered— Her mother is a dedicated SM breast pet for relieving depression. (Mori Kaori JUR-690)

I've been dating my current girlfriend for two years. We live a respectful life, and our physical compatibility isn't bad either. The reason I can't marry her... is probably due to my deep-seated sadistic desires and fragile ego. When I visited her home, feeling unable to make up my mind, I was greeted by her mother, Ms. Kaori... While my girlfriend was away, I confided my inability to confront the idea of marriage, but Ms. Kaori didn't deny my feelings and gently accepted them. In this relaxed atmosphere, my nerves were stimulated in a reverse way, and I vented all the pent-up frustration and sadistic desires I had accumulated on her mother...