Responses
This seems vaguely similar, except it's the principal who has a crush on an external teacher that came to the countryside for the other city teacher - not his ex, just some dude that has a crush on him (characters appear in chapter 2).
https://www.mangago.zone/read-manga/sensei_wa_benki_ja_arimasen/ (porn with a smidge of plot, adultery, sexual assault)
Sorry if this isn't it!
Nope, not that, ty tho
All I remember is that the mcs are both teachers. It's a black and white manga. One of them is a city teacher that got transferred to a village school while the other is a teacher of said school. Last thing I remember was like- the city teacher's ex visiting. (I also think that the ex has a thing for the old principal?!? I might be wrong but, help me