By Gym scene you mean the NTR scene he left in by accident, the one that pissed off both the NTR Haters and the NTR Fans? Yeah I totally expect there will be more unique scenes like that, but I expect them to be rare. The Violet scene isn't NTR no matter what the warning says, it's pimping, but there is nothing stopping it from being an NTR Scene with a minor change in dialogue, those Punters could easily be Darnell and his friends, or one of them could be Pimping her instead of the MC.
For the record I'm hoping that completely unique scenes will be made for the NTR/Bro Routes. But I'm not holding my breath.
Strictly speaking I'm not into NTR, I only like to play those routes if they add something to the story or they make sense. I'm mostly looking for the Alpha/Bro routes to get some Spitroasts, Gangbangs and more Pimping. I'm really happy we got to pimp out Violet , I was never really happy with her Bimbo/Slut arc, I'm glad we can at least make some money of her (hoping it's repeatable).