As a means of stress relief, a teacher by the name of Nakagawa would often meet with men on hookup apps to fuck and forget. However, one time, he ends up matching with one of his students, Yoshino, and that student uses the juicy dirt he got on his sensei to blackmail him into sexual submission----

Nakagawa gets sexually trained by Yoshino. Even his freedom to ejaculate taken away and managed.
Yoshino makes a deal with Nakagawa. If he can endure two weeks without ejaculation, he'll set him free...