Part of what makes NTR work is a certain level of animosity between the people involved that eventually breaks down into something else, but Andras is, well, he's a toxic piece of shit and Rowan is consistently portrayed as someone far too competent to fall for that shit. In general Rowan is not the type of fall victim to NTR. Cheating? Sure, but even though all NTR is cheating not all cheating is NTR. Even at his weakest moments Rowan is alert and aware of himself, it would have to be one hell of a fall from grace for him to submit to that BRD, or that TPV for that matter. I honestly don't think an NTR storyline makes any sort of logical sense for Rowan no matter who the partner is simply because it represents a level of weakness that Rowan has not shown at any point in the game so far. While I have absolutely no interest in the storyline or the scenes, because I'm just not into gay content, I am interested in seeing how it's done as I just don't view it as possible.
Again, though, it's a good thing I'm not writing it as if I was the one writing it then it would end with Rowan revealing he was lying the entire time as he decapitates Andras post coitus... and that wouldn't be NTR.