Awakening: The Red King by Tracy Lauren

Family torn from her grip, the searing memory of loss, and an echoing cry for help—Valerie wakes on the floor of an alien space ship. Trapped there for weeks on end, she clings to one thought and one thought alone: rescuing her sister. All she can do is bide her time and wait for a moment where escape might be possible.
The day comes. A thunderous roar rocks the ship. There’s gunfire. The other prisoners cower, but not Valerie. Valerie waits. Something is coming. This might be her one and only chance to escape her prison. It doesn’t matter how fierce and monstrous this new hero is, or how viciously he killed her captors. As a matter of fact, fierce, monstrous, and vicious are the exact qualities she wants to channel when Awakening the Red King.