The Unseelie Duke by Kathryn Ann Kingsley

Enter a world of darkness and desire, where even true love comes at a deadly price.

In the twisted world of the Unseelie fae, dreams are currency and wishes are power. Izael, the serpentine Duke of Bones, a fae lord with a fierce reputation, finds himself desperate for freedom. And to get it, he only needs one simple thing—a deal with a human. When he sets his sights on Alex, a destitute witch down on her luck, he sees a chance to gain everything he’s ever wanted.
Alex wasn’t expecting to lose her job. It was the last thing keeping her afloat. And now with no money in her account, and homelessness looming, she casts a spell and asks for help from anyone willing to listen.
She should have been more specific.
Now she has a handsome Unseelie fae begging to grant her deepest wish. As far as Alex is concerned, she doesn’t have one. She knows better than to trust him, but he convinces her to take a wager—for seven days and seven nights, they will split their time between Earth and Tir n’Aill. If she truly does not have a wish after those seven days, he’ll make sure she never goes poor again and will leave her alone. If she loses, her wish is his to grant…and her soul is his to take.

As Izael and Alex dance around each other, the stakes grow higher and higher. Will Izael succeed in his quest to make Alex his own, or will she prove to be his downfall?