Rax by Stella Sky

He went to the prison planet to perform a rescue, not to find a soulmate… Dr. Zina Smith is fearless. She has been on her own on a horrifying prison planet for longer than she can count. Her survival depends on staying out of sight, but one mistake lands her under the oppressive claim of a cruel-spirited alien. When another Raither suddenly intervenes, she finds herself inexplicably drawn to the sexy alien, confused by her desires.

Commander Rax Veda is powerful and wise, and has been given the task of rescuing his fellow Raithers from the prison planet. The son of the Emperor, Keldon Marcsu, is his primary concern, so when he finds that the Raither is safe, and has found a female to claim, he is relieved. That is, until he finds himself experiencing an unexpected desire to claim the human for himself. When Zina is abducted right out from in front of him, Rax has to make a choice. Zina technically belongs to Keldon Marcsu, and this act is grounds for war. Is he willing to fight for his love, to the death, and reform his planet?