Prince Theo by Haley Weir

Prince Theo is unable to stop thinking about his human servant and childhood friend, Marquette. This obsession has gotten him in trouble in the past.
There is an unspoken truth in the Kingdom. Beasts are to never get involved with the human class.
Theo goes great lengths to make sure that he keeps his distance from her, as his impulsive wolfish nature cannot be stopped once it’s turned on.
Marquette’s life isn’t as simple as the other humans. She’s in danger, and the only one willing to help is the Prince.
To his surprise, Marquette has known his family secrets all along.
She is not only unafraid, but very much enamored with him.
Only fate decides who Theo’s true mate may be. If he commits himself to Marquette, it will mean the end of his Royal bloodline’s rule.