Adeptus Major by Alex Mykals

It's not quite the world you know. Crown Princess Evelynne deMolay is Heir to the modern-day island nation of Atlantis. Alleandre Tretiak is a foreigner whose quiet shyness conceals secrets and incredible power. When Ally saves Evelynne's life by stepping in front of an assassin's bullet, they are thrown together in the middle of a plot to overthrow the Realm. Ally is forced to navigate a new and unfamiliar culture, while Evelynne must come to terms not only with what Alleandre's power represents, but her own growing attraction to someone totally unsuitable to be the lover of the Heir of Atlantis. Together they must stretch each other's minds, and push the boundaries of a society.