This is a good story, aperpos, that truly fits in with Gay love being still called a sin you go to hell for.
There is the Priest who never before had love or sex, falls in love with his student. There is a lot of smut that make this good story have hot scenes, wanting punishment for his sins to god, and an introspective/ reflective self narration.
The priest loves this student and in acting on it, learns he is deeply submissive and wants pain/humiliation to atone to God for his love of Moroyama. Moroyama is a strict dominant who loves his Priest as well, and while he punishes and pleases his disobedient sub, is also jealous, protective, and kinky. And has feelings.
Fukujuu no Gakuen