The Dark One
Auror
I was always creeped out by the kings and queens being brothers and sisters in Narnia, and yet the reality of royal incest in ancient Egypt doesn't bother me at all.For me, an awful lot doesn't need explanation or justification if the story is engaging. For instance, I enjoyed the two most recent Narnia movies, especially Prince Caspian, and I didn't need an explanation of why/how animals can talk in that word or why there should be multiple kings and queens—brothers and sisters!—in a single kingdom.
I guess it's the mores of the cultures in which those narratives were generated. The Egyptians prized the purity (as they saw it) of bloodlines, whereas CS Lewis created Narnia in the C20. I've only read the first book, in which there was no sex - I daresay it's all entirely innocent - and yet, I couldn't help but imagine all implications of his creation.
CS Lewis would probably roll in his grave to read this thread.