The Alliance — Georgina Lee

The Alliance begins several months after The Demand ends, with the Twin Planets needing to hammer out an alliance that will see both leaders marry for the sake of their planets.
Except that both leaders are far too alike, far too arrogant, and refusing to admit how much they are attracted to each other.
But war is brewing and unless they show their peoples that they can be one unified force, the Veserians will destroy them all.
But now, NaKaya's leader, Toran, finds he can't go through with the final stage of the wedding ceremony, for very personal reasons. This forces D'Minicah, Empress of Vatrel, to take matters into her own hands, and maybe force him to comply.