Keeper Series by Kristine Williams

Still affected by betrayal and deceit, Alexander Marcase feels his life has lost all connection to truth. Unable to come to terms with his own past, he's determined to discover the reality behind Evan's. What they learn along the way reshapes their understanding of Keepers and Sha'erah, as well as their appreciation for each other. But nothing they've experienced this far can prepare them for what they're about to find.

The day Alex Marcase became the new owner of a Sha'erah named Evan, his life turned upside down. Dealing with each other took time, and a great deal of effort on both their parts. In the years they've been together, they've been to hell and back on more than one occasion. Each time growing stronger in their trust and conviction. This time, hell is looking for them. Book 3 in the Keeper series

Adjusting to their lives as fugitives, Alex and Evan have begun forging a new future amid a recovering humanity. Until a ghost from their past threatens to destroy what's left. Facing demons both real and imagined will bring them answers, and open their lives to an entirely new kind of threat. Their future has only just begun.Book 4 in the Keeper series.