Usurper (Children of Lorcan #1) by JM Rose:
 
DMITRY PETROV WAS SUPPOSED TO BE THE NEXT VAMPIRE KING OF RASPIEN.

On the night of his eighteenth birthday, Dmitry unwittingly finds himself at the center of a scandal that turns his life upside down. Stripped of his titles, inheritance, and everything he’s ever known, Dmitry has to learn to live like the other side.

Forced to question everything he’s been taught to believe, Dmitry is determined to forge ahead and build a new life far from the intricate politics and poison of a family bound to a golden chair and the weight of a crown once promised.

But dressing a prince in overalls does not a pauper make, and no matter the distance he travels or how hard he tries to forget, Dmitry has to face a harsh and inescapable truth; that a fate born into is not so easily shaken. When he finds himself at the beck and call of a boy king with too much power and no patience, Dmitry begins to understand that there is more to inheritance than a title and a crown, and blood—indeed—runs much thicker than water.

WELCOME TO THE LORCANVERSE