As Mai reached her teenage years, she became more interested in sex than studying. She had a hentai brother who was repeating a year and would often peek at her masturbating or bringing boys back to have sex. One day, her brother failed in his usual nightly intrusion into Mai's room, and from that day on, the power dynamics reversed, turning the brother into Mai's slave. He is now treated like a butter dog by his sister every day... You reap what you sow!
