Imagination Switch -The Sadistic Teacher's After-School Experiments-

Nozomu Hitsuji is a poor student who's keeping a secret from his friends - that he works part time at a "boys bar" for men. But one day, Nozomu is seen walking on the streets with a male customer, by none other than his dull and gloomy biology teacher, Mr. Ichii. Nozomu is ordered to come to the biology room the next day, where Mr. Ichii gives him a proposition. When Nozomu accepts, a sudden change comes over his teacher, who says "I've been waiting for the day when I could have my way with you," and ties him up...! Surgical role-playing, cross-dressing, molestation and punishment...... As he comes face to face with Mr. Ichii's never-ending fantasies, Nozomu's body gradually begins to understand the pleasures of sex......

(Source: Renta!)