Making his girlfriend's younger sister (rustic, shy, and uninterested in sex) addicted to drug-fueled sex and climaxing, turning her into a sex slave, Luna Tsukino WAAA-052

I met my girlfriend's younger sister, Luna, at her house. Not only was she a shut-in and extremely shy, but she also had no interest in sex, which led me to become addicted to drugs and sex, turning her into a sex slave!