Diana Silver
Troubadour
If your characters accept something as normal, your readers will too. If they're disgusted by something, then your readers will be too.
This.
While in your explanation I can clearly see that you're going into a lot of intersting grey areas (which I love) it also sounds to me like you place this Klonne character as the bad guy for inciting them to behave immorally. That bit feels like the narrative itself it taking sides, casting moral judgment. If the Klonne is 'bad' for fanning their romantic feelings, then incest is indeed bad in this narrative.
Does it have to be? Maybe the Klonne has a real point: that if the MC really happens to love his sister - romantically - and she loves him, that it's only the stigma placed on it by others that keeps them apart. And then question becomes if internalizing that & acting on that is a good thing.
Here's my very personal two cents: I would love this story. I would love it even more if the narrative would (from the start or eventually) do away with the presumption that there'd be anything inherently wrong with it. Explore the full range of the controversy (as I think you're well underway doing anyway), and why it is controversial.
Who knows, it may have something to do with me being asexual... Sexual/romantic desire seems like a fantasy magic concept to me anyway, which I greatly enjoy reading about but it feels always a bit boring and go-to that in 98% of stories it concerns a man&woman following a very run-of-the-mill set of rules (such as them having to be from different lineages, which aparently roots very deep in the wiring of most allosexual people, but as was remarked already in this thread isn't necessarily backed by rational moral or ethical arguments).
All in all, siblings seem refreshingly original and moral stigma a great and complex foe for them to conquer.
Well anyway, this post is mostly to confirm that there's readers out there for pretty much every type of story. So I hope you go on writing, and write it unapologetically.
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