[Hiiragi Popura] TS Hoken Taiiku Kurasu Zennin Nyotaika Jugyou 1-4

An all‑boys school health class forces the students to undergo a gender‑change demonstration, turning them into girls to confront a falling birthrate. They practice intimate contact, handling oversized breasts and using condoms while the teacher urges them to experience a female body firsthand. The tension rises as they grind, twitch, and climax, promising further provocative encounters in the continuation.