Shadows and Roses by Sastri Sylvester

Seduce a queen, save a nation. Nothing a courtesan can’t handle.

Called the Prince of the Night, Castien hasn’t met an aristocrat that he can’t bend to his will. His next target — Her Cruel Majesty, Queen Anais — will be no exception.
But he’s not just after a night of pleasure. The sadistic Queen and her court are everything that is wrong with the world. A rebellion lurks in the abused populace, and Castien has a vital role to play. In this deadly game of seduction, he must slip into Anais’ heart and steal her secrets — secrets that will give rebellion a chance to destroy the throne.
Dance with her.
End her.
Cut off the head of the snake.
And if he doesn’t lose his head, he might just lose his heart.
For Castien finds not pain in her bedroom, but a hand reaching out:
Give me a chance. Trust me.