Cookiezzz After being able to translate the game with fairly decent MTL I learned that the male partners become depressed after you sell their female partners videos to the black market dealer. So, I don't think it's level capped or anything, just required you to fish.
Also for everyone else watching this thread there is a more active thread over here:
https://f95zone.to/threads/translat...ret-ntr-lesson-nontrressun-rj01053661.164549/
That thread has a lot of discussion on using bepinex for MTL translations which are fairly good depending on the engine you are using (Sugoi for example is great).