Girlfriend's younger sister (rustic, shy, and uninterested in sex) drugged, orgasmic, and used as a sex toy. Kosaka Nanaka WAAA-458

He encounters his girlfriend's sister, "Nanaka," a toxic character. She's devoid of desire, shy, and acts strangely. He drugges her, turning her into a sex toy! This seemingly unemotional woman is instantly transformed into a lewd, lustful beast capable of immediate orgasm! He tricks her into taking birth control pills, rapes her with aphrodisiacs, smuggles her into sex with a penis, even has a deliveryman join in a threesome, and has her naked and drugged next to her sister for intercourse! Whether it's choking or oral sex, she receives all sorts of lewd pleasures, becoming a super-masochistic sex toy!