My mother's propensity that I knew. And she also has the same masochistic qualities... Don't spy on her mother and her stepfather's SM sex. Seeing her tied up mother's ecstatic expression, Mai masturbates to her bondage. I was scolded and punished for peeking at her father-in-law while her mother was away. With that as a trigger, her training progresses, and she falls into a rope slave.
