Liam loves his life as a linguist and trader on the Rownt homeworld, but he has ignored his heart and sexual needs for years. After escaping the horrors of war, he wants a boring life. He won't risk letting anyone come too close because he won't risk letting anyone see his deeply submissive nature. For him, submission comes with pain. Life burned that lesson into his soul from a young age.
This fear keeps him from noticing that the Rownt trader Ondry cares for him. Ondry may not understand humans, but he recognizes a wounded soul, and his need to protect Liam is quickly outpacing his common sense. They may have laws, culture, and incompatible genitalia in their way, but Ondry knows that he can find a way to overcome all that if he can just overcome the ghosts of Liam's past. Only then can he take possession of a man he has grown to respect.