Idk, yeah, NTRMAN uses the peeping and bully videos to show some action to the player and kind of humiliate the MC, but this is the first game that really punishes the MC for being atracted to his mom. In A Camp With Mom Extended, the MC gets his reward with his friend mom to cover his new Oedipus complex.I think you yourself explained it, like he doesn't like incest wich is why the MC being a son who feels attraction to his own mom deserves to suffer and be humiliated. At least some games feel like that, like he is punishing the guy for having those feelings.
Mother Lessons doesn't have a clear ending, and the son isn't really aware that the woman on the videos is his mom so... it's a neutral situation?
I'm only counting finished games.
I'm not against your answer, you've got a point, but I have my doubts, specially because if I think that way I'll stop enjoying this games hahaha I get the humiliation part, but the idea of deserve to suffer it's so deep for a hentai game and doesn't really turns me on.