Depends on your definition.
Holly ends up fucking her son, a guy in the fitness and ends up giving a HJ to a guy her son bullied.
Now these all happen before you end up having sex with her in the story.
So it depends on how you view NTR. I know that some people have a very strict "i'm the only one that gets to fuck the girls the moment someone else does it's NTR" view of NTR.
Personally i don't really consider this NTR.
There's also a girl you get a titfuck from as an "interview" for a job and you find her banging another guy later.
But you don't really have any particular love interest in her or any of the girls.
Apart from those there aren't any potential NTR. The other scenes are either the MC banging girls or some guy banging a girl you have no real connection with and never do anything sexual with.