During the three months I was gone, my girlfriend Minami had become... a slut. With her entrance exams coming up, she decided to abstain from sex in order to concentrate. Of course, Minami agreed... or so I thought. Eavesdropping on their conversation, my brother approached the sexually frustrated Minami and raped Minami. Even though she said she didn't want to, the pleasure of his huge dick, something she'd never experienced before, hit on Minami. Since then, while I was at cram school, Minami continued to be raped by my brother in secret, and she had transformed into a slutty woman who craved other men's dicks...