The Priestess and the Dragon — Nicolette Andrews

Exiled for her mother's sins, Suzume lives in a remote mountain shrine training to become a priestess. She would give anything to return to her old life at the emperor's palace. When she accidently awakens a sleeping dragon posing as the mountain god, she thinks he is the answer to all her problems. But she gets more than she bargained for when she unleashes the Dragon, Kaito. He has been sealed away for five hundred years and now he is hungry for revenge. The woman who trapped him may be dead, but he will settle for her reincarnation and he chooses Suzume to join him on his quest for vengeance. What he doesn't realize is Suzume is that priestess reborn. Now she must find a way to seal the dragon once more before he learns the truth.