Making my girlfriend's younger sister (shy, socially awkward, and uninterested in sex) experience orgasms, turning her into a sex slave with repeated orgasms. (Kosaka Nanaka WAAA-458)

I met my girlfriend's introverted younger sister, Qixiangjiang, at her house. She was quiet, unsociable, and aloof. She had absolutely no interest in sex, so I decided to use aphrodisiacs to turn her into a sex slave! Originally a reclusive girl who didn't enjoy sex, under the influence of the aphrodisiacs, she instantly transformed into a lustful monster with an explosive libido! I continued to give her aphrodisiacs, turning her into a sex slave with multiple orgasms, even making her actively seek penises. She even dragged a delivery driver into a threesome, violently thrusting into her in front of my girlfriend, turning her into an ultra-masochistic sex slave! She enjoyed sex, even perverse acts, accepting them with a smile, ultimately becoming an ultra-masochistic sex slave!