Fireborne

Annie and Lee were only children when revolution changed their world, giving everyone a chance to test into the governing class of dragonriders. Now they are both rising stars in the new regime, even though Annie's lowborn family was executed by dragon-fire, while Lee was born to the very aristocrats who used to rule the city. A childhood at the same orphanage forged their friendship, and seven years of training have made them rivals for the top position in the dragonriding fleet.
But everything changes when survivors from the old regime surface, bent on reclaiming their city. With war on the horizon, Lee must choose to kill the only family he has left or to betray everything he's come to believe in. And Annie must decide whether to protect her dearest friend ... or step up to be the champion her city needs. Loyalty and love are tested in this gripping adventure that asks what matters most : the family you were born into, or the one you've chosen.