Waterworld by Juno Wells, J. S. Wilder

Catherina was abducted from Earth. She’s living with the aliens and starting to feel that she’s at one with them. Her guard, Tokalas asks for a small favor. He wants to be part of the agency, but not the administration side of things; he wants a mate.
Catherina time with the agency has been reduced. She’s living with the leader in a palace. She doesn’t need to work anymore.

Tokalas wants her to take a personal interest in his situation. Catherina struggles at first with the one alien that she considers a friend. Eventually, she finds that she has a personal battle to deal with which is far greater than the dating agency. One that makes her consider going back to the one planet that she’d left behind. That planet is Earth. The place that she used to call home.