The story itself is pretty nice. The incest theme is just a bonus. At least is dissuades most of the scum from not reading it and bothering us along the way. There will still be annoying morons, but at least most of them will just take a look at the tags, leave a 1-star rating and fuck off into the sunset.
@greyhud90 it happens ONLY WHEN THEY HAVE CHILDREN. If not, what's the problem? (You could even argue that having kids is morally wrong even when you and your partner is perfectly healthy and not blood-related).
Anyway, you know this is just for the added spice. The author challenges the idea of incest=bad, even when a) they're not aware of each other bloodline, b) most importantly, they're in love with each other, and see how it works out. Could be good, could be bad, but at this point in time, it doesn't deserve all that one star rating.