Chasing the Horizon - Horizons, #1

In fair Aeroterra where we lay our sceneTwo star-crossed terrans fleeOn whose flights learn what it is to be free. Konnor Tendarian, Prince of Seslin - one of the wealthiest kingdoms of Aeroterra - is locked away inside his father's castle. As he comes of age, it's harder and harder to hide that he's a sacra, an inferior type of terran according to his father, and not the heir he was supposed to be. Prince Daxton Austeareus is living the easy life, free from responsibility despite the raids plaguing their borders.
His father tries to reel him in by arranging a marriage to the Seslin prince - a complete stranger to Dax. Dax and Konnor both run from their homes, and a marriage they're not ready for. When they cross paths on their journeys, an undeniable, magnetic draw between them derails both of their paths and brings them closer to the fate they tried so hard to avoid.