Chosen by the Alien

Atlas has long watched his friends and fellow warriors find their mates. He's heard all about how it's supposedly the most magical thing that can happen, how you feel complete and happy and whole, and he's tried not to be bitter over the fact that he still hasn't found his mate. It hasn't been for lack of trying, either. With his skill on the battlefield, he's highly sought after by the females of his kind and other kinds as well, but there has never been that spark. When he's chosen to accompany the princess of their people to Earth, he thinks nothing of it.
It'll be a good distraction from things that aren't going the way he wants them to, if anything. Certainly he doesn't anticipate any kind of foul plot afoot with consequences that reach far beyond their own kind. He definitely doesn't expect to meet Katlyn Pierce, bartender by night, student by day, with her sharp eyes and sharper tongue. By the end of his escort duty, Atlas is honestly not sure which is more surprising: that he's fighting his own people to save a planet he barely understands or that he's fairly sure he's found the other half of his soul.
But the princess isn't above exploiting his newfound connection, and Atlas just might find himself fighting to save his mate as well as the rest of the world.