The problem is not NTR but how it was done especially that the choices don't mean anything.
Examples:
1. Let's say there are two routes: corruption and faithful. If there had to be a sex scene with Leon, then there could have been at least some minor changes in the faithful route (Leon wouldn't cum in her pussy). This way it's exactly the same scene, no matter what the route your on, making the choices meaningless.
2. The morning after when the MC chooses whether or not to tell Clara about Ana. Whichever option you choose, you will get the same outcome - he won't say. Someone will say that in the option when you choose to say to Clara, you get -1 affinity towards Ana. But that's just the biggest stupidity in this game. You can also have -9999999 affinity to Ana, she will still try to kiss/seduce/separate you from Clara.
Can anyone imagine that in Being a DIK you have negative points towards a girl (Isabel, Saga...) and that she still wants to be with you?
It would be much better if that nig*** ripped Clara's ass or that this main boss opened Clara's gangbang season, than she had sex with Leon, because it turned out like a copy of A Promise Best Left Unkept.
I still think this game would be much better if it was played from the position of X. Because X is playing with everyone, managing how much and in which way Clara will be corrupted, and at the same time trying to rob Spectar or whatever the organization was called.