Cage of Starlight by Jules Arbeaux

A conscripted soldier must work with his captor when a mission strands them in enemy territory in this action-packed, queer romantic fantasy by the author of Lord of the Empty Isles.

Don’t make waves. Don’t get attached. Don’t let anyone see the tattoos.
Those rules have kept Tory Arknett alive, alone, and on the run for years in a country eager to put his healing hands to work on the front lines of a brutal war. When a desperate display of magic outs him to the authorities, Tory flees – right into the hands of cold and competent Sena Vantaras. Caged in a cruel training facility and implanted with a magical tracker, Tory needs to get out before he gets dead.
There’s just one thing he has to do: make Sena pay.
But Sena is already paying more than Tory knows, and when a mission strands them in enemy territory, they must cooperate to survive. As they learn the truth about each other and the myth behind the magic that connects them, Tory and Sena find belonging together.

Their trackers will kill them in three days if they don’t return. Soon, Tory and Sena face a desperate decision: their freedom, or their lives?