Although, the incest wasn't the main focus, and it was viewed as wrong by the MC, especially in the second book. Kas - One thing I've noticed when reading submission guidelines is a lot of them said, no high fantasy, no incest, and such. It seemed to me that a lot of published don't care to published high fantasy or incestuous relationships.
Kas, there is probably publishers that will accept it, so long as it isn't graphic. I wrote a poem about wrongful termination of a pregnancy and have found it impossible to get it published. I received responses from 3 publishers all saying while it was a well crafted piece and all that huff, they wouldn't post it because it was 'too' dark. The piece is a little too graphic and if I tone it down 'a lot' I know it will get published, but I love the piece how it is. So if you want to go ahead with trying to get such a story published, just be careful how much detail and how graphic you make it. Either way, best of luck with your piece.