Argen Mate by Clarissa Lake

Argen Trematu was home on leave at Farseek Brigade when the Sargan’s attacked his home world. With Farseek in ruins, Argen was captured and sold into slavery. Lieutenant Commander Trematu didn’t make such a good slave and landed him on the Julconi prison planet fighting in the pit. He thinks his life is over until he learns the Farseek Mercenaries were on the way to the rescue. Argen never thought landing on the prison world would be his lucky break.
…. Then me meets her on the rescue ship.
Zoey Addison was kidnapped from Earth and rescued by the Farseek Mercenaries. She joined the Mercenaries with her three friends because she had nowhere else to go. Her friends all found their soul mates among the crew and Zoey was feeling left out.
….Until … Dressed in rags and so dirty she could barely discern what color he was, Argen walks up to her table and takes her hand. The attraction between them all most crackles.…