Konna Hazu ja Nakatta no ni Even though it wasn't supposed to be like this

Synopsis

Ryuzaki is an aloof high school student who likes to seclude himself in the infirmary. This, however, teases the stubborn school doctor, Wataru, to seek out other men to quench his lust—!? Or is this love? They both wonder as they desperately fight with their morals. To do or not to do? (source : Fantasy Shrine)