Alien Prince Defender by Zara Zenia

An outlaw alien protecting Earth. A human woman determined to save lives. A battle for the future.
Chicago Paramedic and firefighter Grace Orloff has been sucked into a war that isn’t hers. Frustrated with his inability to stop the Spaceknights, King Garnon has sent a robot army to attack Earth in hopes of drawing them out of hiding and into the conflict.
While Garlin leads a team to try to infiltrate the mothership controlling the android army assaulting Earth, his cousin Tarax, along with a few other members, coordinate the resistance planetside.
Thrown together fighting an alien invasion, Grace and Tarax fall for each other hard in the midst of the crisis, and end up pinned down in a derelict building with a dozen frightened survivors, forced to defend them from the robots.
Sparks fly between the courageous and compassionate Grace and the fierce and determined Tarax, but even if they survive the barrage from the invaders, will their differences mean an end for their future?