Well, the 'real corruption' is there, even if you don't 'get to/are made to' watch it. It's implied, so you get the feeling of it, without him wasting time on those when there is so much more that needs to be done (I mean, have you seen how limited the guys are in HS? It's pathetic).You are right, so you are corrupting some of them but you don't actually get to see any of it. Honestly, that's even worse. Its like eating pie when you could be eating ice cream and pie together. If I wanted a text based game about the real corruption in a game I'd play the Eragames (I mean....I do but you get what I mean)
And honestly its not the NTR I want, its the real corruption I was seeking. I don't consider it NTR because you manipulated or mind controlled the girl you want to fuck and let her fool around. Though either way NTR is just a thing to me, not a minus or plus. Unless I actually care about the female involved than I'll probably hate it.
As you say, if you care about the character, and I usually do, it feels bad. Even when it's technically not netorare, it can feel that way, particularly when you know they will be an option, or even when you just 'want' it to be one. It's like seeing someone taking a toy out of the package and playing with it in the store, when you were planning on buying it. If my toy is going to get broken, I want to be the one who breaks it.
I would suggest the trainer style games then, that seems to be what you are looking for. There are a fair number of them as well, from Princess Trainer (Witch Trainer, Star Channel 34, etc.), to Game of Whores, Whore of thrones, and so on. There are a number of them for Star Wars, Game of Thrones, Avatar, Witcher, and more. Most of those are closer to what it sounds like you want. Sorry if I am misunderstanding again (it's a hobby).