[Umino Sachi] Gakkou... Dai yon wa san'nin dake no shigyoushi

After the busty principal wraps up her opening ceremony speech about surviving the summer heat, the real assembly convenes in a steamy bath — an ffm threesome where married beauty Saya purrs that her lover Kazuki's cock is the only one she likes, poor husband none the wiser. The curvy, glasses-wearing bbw and her partners worship him together before yuri play takes over, the principal losing control of her bladder straight into an eager waiting mouth and loving every second of it. By the time she's gasping through ahegao bliss and declaring her asshole his exclusive property, one girl is left pouting about being left out — proof that at this school, the best ceremonies only need three participants.