Fire in the Heart by Hailey Turner

Surrender to vows.

Staff Sergeant Alexei Dvorkin has come a long way since being turned into a metahuman, and all he wants to do is marry the man he loves. A wedding is easy, but it’s the honeymoon where his past unexpectedly catches up with him.

A future together.

All Agent Sean Delaney wanted was a romantic honeymoon with his new husband. When he and Alexei stumble into a fellow operative’s mission on the luxury gambling resort island Fortuna-sur-mer, they get more than they bargained for in their newly-minted civilian lives.

Destined to burn.

Forced to choose between staying and joining the mission or leaving to stay safe and postpone their honeymoon, Alexei and Sean make the only decision they can—to fight.