There were too many sex scenes and the plot suffers because of it, in addition those scenes are not original and too repetitive and quickly become boring. The story could have been interesting otherwise, they were some original ideas like the fact that Ethan is a tattoo artist, but there weren't many pages left to develop it. 
 I am generally annoyed when I see a love triangle in a book and the heroine hovering between the two men without being able to choose, that's why I find the resolution here interesting. However, the author doesn't really explain how their relationship could work but instead focus on the sex... 
 Ethan has powerful magic developing and she is losing control of it but she doesn't try anything to understand it. Even when Eamon propose to help, she refuses instead of trying to get answers on her own terms; having sex with him was far more interesting to her... I didn't think that Eamon was credible as a powerful immortal, apart from being a little clueless about human interaction and too authoritative, he thinks and behave like a human. 
 I am also uncomfortable with the use of rape in novels unless it is treated extremely well and it is essential to the plot. Here I think that it was use to carelessly and it annoyed me. For example, Ethan has to relive the rape of a young girl to learn who were responsible for it and, apart from throwing up a little, she has no problem with it, she even have sex just after... For me it's not credible and disrespectful to rape victim.