Malice by Heather Walter

Once upon a time, there was a wicked fairy who, in an act of vengeance, cursed a line of princesses to die. A curse that could only be broken by true love's kiss.

Utter nonsense.

Let me tell you, no one in Briar cares what happens to our princess. I thought I didn't care, either. Until I met her.

Princess Aurora, last heir to the throne, the future queen her realm needs. One who isn't bothered that I am Alyce, the Dark Grace, abhorred and feared for the mysterious dark magic that runs in my veins. But with less than a year before the curse kills her, any future I might imagine for us is quickly disappearing - and she can't stand to kiss yet another idiotic prince. But maybe I can help her. If my power began the curse, it might be the one to lift it. Perhaps, together, we could forge a new world.

But we all know how this story ends. Aurora is the beautiful princess. 

And I am the villain.