Blue Archive - Saori to xxx Shinai to Derarenai Heya (Doujinshi)

The mission that Saori received from the black market had a condition that it must be done as a male-female pair. She asked Sensei to help, but he becomes trapped in a room together with her and they can't leave until he has xxx with her.

He knows that he shouldn't lay a hand on his pupil, but when faced with the pure and innocent Saori regarding this kind of thing, he finds himself teaching her all about sex for the sake of accomplishing the mission...

(Source: Melonbooks)