Hunter of Worlds

"In the story, a ship belonging to a terrifyingly dominant space-faring race, the iduve, arrives at a space station. They demand that a particular station resident, a blue-skinned Kallian, be sent to their ship and all record of him be erased. No defiance is possible or the space station will be destroyed. The human-like Kallian is handed over to the iduve who mind-link him to a female Kallian in their service and, later, to a human prisoner, forcing him to service his captors on three levels"--Wikipedia.