This is much more erotic than I normally read, but that seems to be a theme of late, due to several recommendations from friends.
That being said, I did enjoy the story. The thought of the government making new "breeds" by messing with DNA coding was intriguing. And in addition to the HOT romance between Callan and Merinus, you just get an overwhelming sympathy for the people who've had these experiments and testing done to them. I'm curious to read the rest.