Book One in the Myth and Magic Series
I've read all the Riley Jenson Guardian books. She has several more series, although I think at least one of her others has not been released in the U.S. yet. (Ms. Arthur is from Australia.)
So far there are just two books in the Myth and Magic Series and her web site does not mention anymore to be released soon. I really enjoyed this book. The main characters are sea and fire (or air) dragons. It's kind of a mix of Maximum Ride, a Miyazaki movie, and a romance. It was interesting, I enjoyed the plot and the characters. Very entertaining.