My childhood friend, a submissive high school girl, was trained to be a submissive anal sex pet, Mai Hanagakari MVG-130

I grew up with my childhood friend, Mai. She was introverted and not very noticeable in class. I liked Mai and thought she probably liked me too. One day, a delinquent in my class showed me a pornographic video. Hearing a familiar voice, I realized the person in the video was our homeroom teacher, Sudo Kazuma. Incredulous, I decided to go to Ms. Sudo's house with the delinquent to spy on her…