Sensei, Ijiwaru Shinaide Kudasai

Shiba, a physical education teacher at a high school, is dating Higaki, the school counselor. After school, after office hours are over, they have an adult affair on campus. While Shiba is happy to be able to see his boyfriend at work everyday, he still has one problem. He has never been able to get Higaki to say "I love you" to him. Higeki can be somewhat mysterious and evasive, and Shiba is always having to take the lead both in daily life and in bed. Shiba tries to get Hinokaki to express his true feelings, but...!

(Source: Gush Comics, translated)