After losing a punishment game, I ended up dating the most introverted girl in class, Kasuga-san... To my surprise, she was incredibly proactive and enthusiastic about sex. I followed her lead and had sex with her. The next day, Kasuga-san who showed up at school had completely transformed, both in appearance and desire! Her escalating sexual urges, fueled by a craving for stimulation, unleashed her pent-up libido, and she devoured dick after dick!