The Paladin’s Shadow by Tavia Lark

Kidnapping with benefits.

Karis is the arrogant young prodigy of the Radiant Order, and his talent gets him plenty of attention but very few friends. Under the order’s prying eyes, there’s one secret Karis has to hide at all costs: the meddling, un-paladin-like voice in his head. Sometimes the voice is helpful. Sometimes it gets him into trouble.
This time, trouble’s name is Ronan.
Ronan does the dirty work. Anything for the trickster god he serves, no matter how tired he’s getting. He’s so used to deception, he wouldn’t recognize real love if it bit him. When he’s captured by the Radiant Order, he doesn’t think twice before kidnapping a cute little squire to cover his escape.
His new hostage is a lot more complicated than he expected.
Between escape attempts and counterspells, Karis keeps getting under Ronan’s skin, and Ronan keeps getting inside Karis’s head. And the longer they stay together, Karis starts thinking less about escaping, and more about how Ronan might taste.
But the conspiracy they’re tangled in is far deadlier than they know.