The Hocus Pocus Handbook by Ann Aguirre

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Thea Winter didn't choose to be a changeling ― stolen from the mortal world as a baby, raised in the wildlands by a hobgoblin named Mudge who taught her everything worth knowing. How to read the weather in a crow's wing. How to barter with brownies. How to stay alive in a world of capricious fae courts. What Mudge couldn't teach her was how to stay out of trouble. Which is why she's entangled in a objectionable marriage of convenience.

Or would be, but her spouse bolted. Now she has to hunt down Devan J. Fenelon, but she's been saddled with a taciturn, humorless hunter known as Winter's Hound. He answers only to his cousin, and she's not looking forward to this quest at all. 

Kerboros has survived the Winter Court by being exactly what they made him: relentless, invisible, and careful never to want anything at all. His life is an endless series of ceaseless commands from his reprehensible cousin, Lord Liskaal. Since his father's failed rebellion, Kerboros has been permitted to survive only as an example to others, an object lesson as to how far one may fall. But traveling with Thea―wild, warm, impossible Thea―is a glorious torment for an enforcer who has never known freedom. 

She is sunshine. He is shadow.

Their love is forbidden, but when irresistible force sweeps up an immovable object, the resulting reaction might be magical…