Heartscale (Thunder of Dragons #1) by Lola Ford

SPFBO6

On one side of the world Graith discovers a dying dragon in his barn. While the country is hunting after the monster, he doesn’t hesitate in doing his best to aid her. Before she is fully healed, Azelia urgently needs to get back to her cave to protect her eggs. Unable to even fly, Graith decides to accompany her, worried of what might happen. On the other side of the world, where the future ruler is decided by dragons, Nerie is chosen by the Kiriga, the golden hatchling. Raised as a merchant in the middle district of Roria, she’s shocked to learn that she is the king’s bastard. Thrown into a chaotic palace life, she’s forced to balance learning to be princess and being bonded to a dragon.