Laverna by Alessa Thorn

Rome has always had two rulers – Romulus, the god of the above, and Laverna, the goddess of the below. But the time for their hostile peace is at an end, and if they don’t come together, the whole city will burn.

Laverna, the goddess of thieves, has always ruled Rome’s underground with her army of outcasts. When her people are found dead, killed by a monstrous beast, she turns to the biggest beast she knows for answers—Romulus, the king of Rome himself.
Rom has lived his entire life cursed. If being tied to the great city he founded and forced to shift into a wolf every full moon wasn’t bad enough, his inner wolf is also obsessed with Laverna—the one woman who will never have him.
Fate has a way of messing with the gods the way the gods mess with mortals, and Laverna and Rom will finally have to bury their past animosity to fight ancient enemies and protect their city. They will have to finally use their words and, in doing so, rewrite their own histories and learn that their passion for their city might only be outdone by their passion for each other.