Holy shit, dude. Let's actually see where the story goes before we shit all over the Dev.
Is there a possibility for NTR? Absolutely there is. That's the drama of this particular VN: will MC get what he wants? Will he get his niece? Will he keep his wife? Or will he make all the wrong choices and lose everything?
If the Dev doesn't give a chance to avoid the NTR content (ie make the right choices to keep the girls safe from Pervy McPerverton), then go ahead and get your pitchforks.
But let's save the abuse for then, yeah?
Well this update had zero choices till the end, and either choice led to the same result...boss coming over for dinner and looking forward to the meeting/interview with Rebecca.
At the start of the update, the MC is standing outside a door listening in on someone in his house having sex. By the look of the door it was Rebecca's room, MC's inner monologue was debating at first it might be porn playing. Given how he got Rebecca hooked on watching porn, and more inner monologue confirms to himself it's definitely two people having sex. How could it not be Mike raping Rebecca. And being it presented in a present time, then going to a flashback of events leading up to him standing outside the door listening in on what's happening.
It's pieces of the puzzle that all fit together, if you have a different theory, I'd love to hear it. If I end up being right, I'll predict my post will be tame compared to others.
Edit: That ruins anything possible for romance with Rebecca, how the fuck is the MC going to have any sexual interaction with a rape victim. I'll check out the update, but this is turning into a story I don't care to read anymore.