His Protector by LJ Vickery

Gabriel Quenterra, a drangel with the FPU and the alpha of a local wolfpack, has a lot on his hands. What he doesn’t have time for, is Val, the handsome Strarbian who has become a major distraction. There’s no room in his life for a relationship, but a short fling? Perhaps.
Valor Addis has been attracted to Gabe since coming to earth, but a dire secret makes it far too dangerous for him to enter into a relationship. He could give his heart so easily, and there lies the problem. If the dark alpha makes the slightest overture, his resolve will surely crumble. But what a way to fall to pieces.