I'm just not entirely sure what the POINT is, if the relation isn't being treated like a big deal.
Not having an incest kink, I can't really say how someone who does have one would respond, but...like sistermagpie said, it...kind of seems like...NOT catering to the kink, sometimes.
But if it were for one of my odd, potentially squick-worthy kinks, I'd find the lack of emphasis the aspects that define the kink, and might squick those that don't have it (or even those that do) to be...boring at best, an unfun cop-out at worst.