Kept in the Dark by Charlie Cochet

Former Army Ranger turned government assassin Álvaro Montero and CIA Officer Caiden Cardosa crossed paths two years ago in Vienna, where their encounter ended less than amicably—despite the explosive sexual chemistry between them.
Now Caiden is riding a desk at Langley after his cover is blown. And Álvaro—who was “killed”—has a new identity and purpose as Delta/D, an operative for the Locke and Keyes Agency, under the leadership of the mysterious Alpha Orion.
When D and Caiden team up in a deadly black ops mission, the urge to kill each other will have to take a back seat to the desire for revenge against the man who betrayed them both. Surviving the mission won’t be easy. Resisting the passion between them—that might be impossible.