My girlfriend's younger sister (rustic, shy, and uninterested in sex) led her to become addicted to drugs and sex, turning her into a sex toy. Mio Ichijo WAAA-245

At his girlfriend's house, he met her unfriendly younger sister, Mio Ichijo. Not only was she a recluse, but she was also very shy and had no interest in sex. He drugged her, made her take drugs, and had sex with her, turning her into a sex slave!