I am withholding my rating for the time being as I did not enjoy this book as much as I'd hoped and I'd like the author to have a fair go on release day.

I loved the concept of blood magic and how well explained it was. I don't think I've read something quite like this before. 
The dialogue However, is very poorly written. All interactions in the book are not well done. The writing in these instances feels juvenile. It was so odd that the magic system and the world were generally so well written and then the general conversations between characters weren't. 

The sex scenes were not well written in the sense that the language used was overly consensual if possible? The characters were so busy asking permission barely anything got done and it's over in like 2.5 seconds.  I love a good breeding kink and knotting so I was totally fine with those subjects. Be aware that these are present in detail.