Exile — Aleksandr Voinov

Kyle Juenger and his lover, the Glyrinny currently known as Grimm, are home free. With Kyle's transformation underway, they're heading toward alien space so Kyle can meet “the family” and work out just what being a human-alien hybrid will mean. He certainly doesn't have access to any of the promised Glyrinny powers yet.
On the way, however, they encounter a group of refugees who fled their home planet, Tamene, when the Doctrine moved in. A militaristic, collectivist power bloc, the Doctrine has been swallowing up planets and peoples in its mission to unite all of humanity in its own concept of “brotherhood.” Kyle finds it impossible to ignore that the Doctrine is about to destroy the culture of his home planet.
But when they arrive on Tamene, the Doctrine officer in charge, Arkady Kidashell, is nothing like the “Doctrine zombies” of lore. A recent convert himself, Arkady gambles for nothing less than reform and peace, and Kyle and Grimm may be about to ruin his best-laid plans and intentions …

Exile is the sequel to Incursion and set in the Doctrine Wars universe.