Hearts Bound by Silver — Lynn Stark

Max had survived a nightmare after being kidnapped by hunters. After being rescued, and traveling to his new home on a farm where many paranormal creatures lived, he found his mates. One was Roan, a gargoyle. The other was Garth Danvers, a wolf shifter. There was one huge obstacle, however. His mates hated each other and he was stuck in the middle, wondering how he could change their feelings. Neither of the big, bad alpha-types wanted to be the one to submit, to be less dominant than the other. It went against their nature. There was no doubt that they loved Max, but there seemed no hope that they would ever be able to create the special bond between them. Love and babies were put on hold. They wouldn't happen for Max if his mates decided to kill each other and put an end to his dreams.