Gyaru seito no ryou chikubi name kairaku akume ni kusshite futari no rezu petto ni nari sagaru onnakyouin 3 – Hinata Tachibana, Aori Arihoshi, Mito Wakui

A busty female educator is caught in the middle of an illicit affair on school grounds. The witnesses: two lesbian-leaning gyaru students. Intrigued by her breasts, they blackmail her and begin groping her relentlessly, focusing on intense nipple stimulation. Unable to resist, the teacher succumbs to pleasure and awakens to lesbian submission and masochistic desire. Through persistent training, she's turned into a "nipple pet," collared and paraded around the poolside as her students' obedient plaything.