I would be fine with this being a scenario where the teacher tries to paint you bad to both of em and try to get nicole ONLY if the game gives you the option to fuck up Bmans career, and there has been plenty of chances for this, so if they want this to happen then a fight back option must be there and since he would be trying to take nicole after going after chloe the option to blackmail chloe must also be offered. And this better be a well done well thought out thing and not some NTR throw in to cater for just the sake of it catering. Like I said I am not a fan for it but I am not against NTR either, however when it is well done in a way that makes a bit of sense then I am all for it as to me a good story matters too, Just blindly fapping I got plenty of websites with hentai and porn comics floating around for that noise.
Some of those I have answered before but might be way back hidden so Ill explain some for you as it seems you might have missed some details and then you can go play the game again and see if I am right or not but it def will give you a bit more understanding.
Mother showing up on your dates with chloe:
Nicoles dates and payments:
PS: And Also because of how Chloe is made up on routes you play that her NTR persona makes NO SENSE at all and it is 200% out of character hence why I dislike the way the NTR is done in this game and also why a lot of people have complained about it. While for some Chloe is not likable or not interesting that is fine but the fact is and remains that chloe by no means is actually dumb or retarded, she can puzzle things together and is smart as with a bit of info she can think and make sense of things, being jealous and suspicious was not wrong of her as you technically was doing some fucked up shit behind her back, so her being mad and such is a given right, again she is not stupid she was just wanting to know what was up, and when you give her an explanation she fully commits back to you and safely deduces that someone was watching you both and does not doubt you after that. So again the NTR while I have nothing against it being there it is done very poorly and imo should be reworked and also the blackmail and getting back at bman should be added, because one thing in every NTR game so far that I have seen is that the MC is "powerless" while there are PLENTY of ways to get someone back or get something back out of it and here in this game there is no exception, the reasoning for it is also already there, Bman and MC hate eachothers guts, no way he would let this teacher take his girl and not try to end his career and private life, specially knowing he is a teacher and a married one at that and iirc he might have a young child too, so enough to make him consider all his choices if you present him with proof.