His Wolves by Hawke Oakley

Kidnapped, pregnant, and alone.
Matheson’s worst fears have come to life. Deep in the gryphon’s territory, he’s cut off from all three of his mates, and completely at the whims of his enemies. Worse, the king of the gryphons has a terrifying secret–one that threatens to sever his bonds with his fated mates.
His life depends on the prophecy, but the final truth of it has yet to be unlocked. Matheson desperately needs the key, not just for his own survival, but the survival of all shifters. But when an unexpected romance swoops in on the wings of a friend, Matheson realizes it might just be the key he’s been looking for.
With a baby rapidly growing in Matheson’s belly, danger mounts every day. His wolves must save him and their unborn child–or lose them both forever.