Kasumi Nakasaka, an 18-year-old class representative with a responsible and mature personality. However, surprisingly, she's a masochistic pervert who gets intensely aroused by rough treatment. When a penis is shoved deep into her throat for forced deep throating, she gags repeatedly, vomiting while tears stream down her face. When her fingers are forcibly stimulated, her arousal intensifies even further, causing her pussy to squirt gush after gush as she orgasms uncontrollably. Even while being fucked doggystyle in her school uniform for creampie, pressing a vibrator against her clit sends her into even more violent orgasms with continuous squirting. Wearing a tight competition swimsuit, she inserts her own fingers deep into her throat, forcing herself to vomit—revealing the complete transformation of Kasumi, now utterly addicted to cock.