Force your girlfriend's younger sister (unsophisticated, socially awkward, and uninterested in sex) to orgasm, turning her into a sex toy. (Arai Rima WAAA-579)

The landmine-like younger sister "Rima" I met at my girlfriend's house. She rarely speaks, is awkward around strangers, and has absolutely no interest in sex. I'm going to use aphrodisiacs to turn her into a sex toy! Her slender body is driven to the brink of collapse with repeated orgasms, turning her into a lewd, lustful beast! Vigorous thrusting and ejaculation with aphrodisiacs, begging for a penis during sex, begging a deliveryman for a penis to thrust into her and ejaculate inside her, and having naked NTR sex with aphrodisiacs in front of my girlfriend! Even intense play makes her happy, turning her into a super M ejaculation sex toy!