Cinders and Fae: A Retelling of Cinderella

What really happened after the ball? Marriage to my wolf fiancé is forbidden by the Fae Queen unless I pull off an impossible feat of magic. If we run, we'll die. I’ve almost given up when I have a bright idea — or rather, a dark one. Something which doesn’t involve Fae light, but black magic. If it works, the queen can’t deny our wedding. And if it doesn't, my brilliant solution will kill me.