Black Sun by Michelle Madow

Amber Benson has no idea what to do for the rest of her life, let alone what major to pick for college. So when she inherits an apartment in Manhattan from a grandmother she never knew, she moves there faster than a New York minute.

Her plan to find herself is soon derailed—on the subway, where she’s attacked by demons.
Even crazier? She defends herself with something she never knew existed: magic.
But it’s not her newfound ability that saves her. It’s the intervention of a mesmerizing warrior with otherworldly grace… who then proceeds to kidnap her to a supernatural kingdom hidden in the heart of the city.
Because Amber’s savior—Damien Fairmont—is a king. A vampire king.
And he’s just declared to his entire kingdom that Amber’s destined to be his bride, whether she wants to be or not.

But trying to escape her so-called destiny as Damien’s queen isn’t Amber’s only problem. Because dark forces are rising in Manhattan. And now that they’ve gotten a taste of her powerful magic, she’s not just a target for Damien’s affections, but also for the sinister shadows that lurk in the underworld of the city.