Fire in the Flesh - Jennifer L. Armentrout
Tax included.
The only thing that can save the realms now is the one thing more powerful than the Fates.
After a startling betrayal ends with both Sera and the dangerously seductive ruler of the Shadowlands she has fallen madly in love with being held captive by the false King of the Gods, there is only one thing that can free Nyktos and prevent the forces of the Shadowlands from invading Dalos and igniting a War of Primals.
But Nyktos will do anything to keep Sera alive and give her the life she deserves. He'll even risk the utter destruction of the realms, and that's exactly what will happen if he doesn't Ascend as the Primal of Life. Yet despite his desperate determination, their destinies may be out of their hands.