well, immediately seeing "this story features inc*st" is a for sure way to get readers to drop it before even reading your synopsis. Just put that warning in the designated chapter 
edit: okay, um, well for one, I read chapter 1, and Tapas might have an issue with familial relations in such a... way. It's been an issue with a premium story before and the person had to change it.
I was pretty uncomfortable reading this. It's up to you if you want to continue that premise.