Mastered: A Dark Sci-Fi Reverse Harem Romance (Vakarran Captives)

Over the years since the Vakarrans conquered Earth, the few humans who remain free have been living in hiding, biding our time, trying to survive, and waiting for our chance to strike back. My sister was our leader, until the enemy took her. Now the task falls to me. But when I come face to face with four Vakarran warriors for the first time, it is nothing like what I expected…