Strawberries and Snow by Michelle John

A slave with forbidden magic. A lonely prince. A love that could burn an empire.
Sylvarin is a human slave, born into the royal household of an Incubus clan. To his immortal, lust-eating masters, he is disposable. He survives by staying small, silent, and obedient.
When he is ordered to spy on his master’s youngest son, he knows what is expected of him: manipulation, betrayal, and loyalty to the man he hates most. Disobedience is not an option. Mercy is a luxury he cannot afford.
But Prince Ushi is not what Sylvarin expects. A rebellious vintner with soil under his fingernails and a sweet, dimpled smile, Ushi is lonely, brilliant, and quietly dangerous. As Sylvarin’s assignment draws them together, he discovers powers he was never meant to have. Fire magic, forbidden and impossible, burns in his blood.
When Sylvarin’s magic is exposed, escape becomes their only choice. They flee across the Wasteland toward Avalon, an abolitionist city where freedom is promised…if they can survive the journey.
As old masters tighten the noose and new enemies close in, Sylvarin must decide how far he’ll go to protect the man he loves. To save Ushi, he may have to wield the very power his masters tried to beat out of him—
and burn their world to the roots.