[Iguchi Sentarou] Classmate to Ecchi Jugyou Season 2 Ch.3

A curvy, ample-breasted instructor turns class into an erotic survival game, announcing a pairing system that leaves her students exposed, breathless, and scrambling to decide who will touch whom. As the gym-uniformed classmates crowd together, comparisons, confessions, and demonstrations turn their nervous laughter into escalating exhibitionism. The instructor ultimately pulls one stunned boy into a close, hands-on lesson while the rest of the class looks on.