Of Frost and Feather by Eliza Raine

Maddy used to think she knew what would end her life. Now, the list is too long to guess from.
And possibly the most dangerous of them all?
Kain.
Every day she spends at Featherblade, more secrets are revealed, and it will only be so long before one of them is hers.
When Kain has what he wants from her… She fears it won’t just be those who wronged him who will feel his wrath.
She must be strong. She must earn her wings. She must resist the promise in his flaming eyes.
She must not fall for the villain of Featherblade.