The Forest Bride: A Fairy Tale with Benefits (Sylvania) by Jane Buehler

He saved her life. Now she’s wondering why. Rose will never escape the castle. The guards have caught her every time she’s tried. After thirteen years imprisoned in her tower, she’s resigned to her fate of an arranged marriage to a vain, tiresome, and/or brutish prince. Until she meets Dustan. Dustan isn’t like the other princes who’ve come. He’s kind and asks Rose her thoughts. But Rose discovers that Dustan harbors a secret—he may not be a prince… or human. Too soon, her father chooses a different suitor, a sinister one with a wicked plan. After Dustan saves Rose’s life, she follows him into the forest. Rose hopes to hide from both her fiancé and her father. But can she trust Dustan, or does he have a hidden agenda—or does that even matter, if they’re falling in love?