MIDA-647 Giant Dick NTR: A gym teacher with a huge cock forces his beloved slender club manager's undeveloped pussy deep inside, thrusting and making her arch her back and twitch as she orgasms against her will. - Shiraishi Nami

Nami is the volleyball team's manager and is dating her classmate, Takashi. Kurosawa, the physical education teacher who had his eye on Nami for a while, witnesses her having sex alone after school. It seems Takashi's small penis isn't satisfying her. Seeing Nami's still-untouched vagina, Kurosawa, wanting to violate her, shows off his huge penis and forcibly inserts it! From then on, she is "developed" by Kurosawa...