The Curse Between Us by Layla Moran

The kingdoms of Rafria and Eskarven have been locked in a brutal conflict for centuries. Edric and Zephyr, the heirs to these warring nations, have grown up in the shadow of endless battles. When a catastrophic war results in the death of their predecessors, the two princes inherit their thrones, and with them, a fragile hope for peace. The solution seems clear: a formal alliance through marriage between the newly crowned monarchs.
What starts as a mere political strategy soon evolves into something far more profound. But there is a severe obstacle—the two men cannot touch without experiencing excruciating pain, the source of which is a mystery they must unravel. As they navigate their unusual bond, they realize that their alliance may bring more than peace. Ancient powers, long buried, begin to awaken, and if Edric and Zephyr can overcome the challenges before them, their love might reshape their world forever.