So, I'll be leaving a comment here about the NTR as there are various forms I've learned from it and apparently I need to be more clear.
Firstly as stated, other love interests you do not choose may be taken depending on which girl you choose.
Secondly, some of the girls you choose will probably have an interest or be dating another guy however your choices will make the girl yours instead, which if I am correct is one form of NTR.
Thirdly, if you mess up choices and go towards the path of a dead end, you will lose the girl or worse, get NTR'd yourself, just like real life.
I am still thinking on how I want to write this out so everything is not 100%, but I want to write it out in a way where consequences exist so if you're still not a fan, oh well.