I'd advice you to read these books in order. Since they aren't numbered atm, this is the chronological order: The Alpha's Warlock, Captive Mate, The Alpha Experiment (can be read as a side story, to the main plotline), Lost & Bound and lastly this book. Ash not being able to feel anything physical, especially in the sexual department, reminded me of being asexual. It was really nice listning to this story. Just as the previous books, we get a couple, hopelessly in love, but who suck at communicating with each other.