Hanna and the Hitman by Honey Phillips

An alien assassin. A forgotten human. A planet determined to claim them both.

Since being kidnapped from Earth, Hanna has been treated as little more than a performing animal. Her latest indignity is being displayed in a cage in a seedy bar. When a massive alien warrior stops to examine her, she expects the worst.
To her shock, the warrior frees her instead. Scared and alone, she doesn’t hesitate to turn to him. But there are more surprises to come…
Aidon is running out of time. Although eliminating galactic scum is a profitable occupation, it takes a toll on his unique skills. He needs to return to his planet immediately. Acquiring a human female, no matter how tempting, was not in his plans. Yet now that he has her, how can he let her go?.
She looks at him so trustingly – but his planet is a dangerous place, and she’s about to find out he’s the biggest predator of them all.