Cursed Fae by Sarah Tobias

Emily desperately wants a name for what she is. For what is changing her.
… and so does the guy who hunts her.
Emily learned early to keep her head down. After her mother was committed to a mental institution and Emily went to live with her aunt, there was no more talk of monsters and creatures from other worlds—or that Emily is one of them.
Living a life of quiet solitude as a barista and waitress in New York City, Emily’s only complication is her unabashed best friend, and that’s the way she likes it.
Until the day something shifts in her blood.
It might have something to do with the alluring man who strolled into her coffee shop in the dead of night, the one who sent shivers under her skin unrelated to supernatural stirrings.
Or, that’s what she hopes, since it’s more preferable than the shape-shifting eyes and growing fangs she keeps seeing in people she knows.
As Emily learns that her world has been infected by fae that consume human souls and fit seamlessly into the bodies they empty, she must also accept that she could be one of them.
Yet, she is different from the rest, because her fae didn’t inhabit her, it was awakened.
And it wants her to succumb … to her destiny.
Too bad that cute guy from the coffee shop was sent to kill her before she reaches it.