Dark Choices: Paradigm Shift by I. T. Lucas

Edna and Rufsur are miserable without each other, and their two-week separation seems like an eternity. Long-distance relationships are difficult, but for immortal couples they are impossible. Unless one of them is willing to leave everything behind for the other, things are just going to get worse. Except, the cost of compromise is far greater than giving up their comfortable lives and hard-earned positions. The future of their people is on the line.