Bound to the Tiger Scout by Delaney Rain

Squire Landry has lived in a hell of his mother’s making ever since she joined up with a hate-filled church that’s now led her to Humans First, the domestic terrorist group determined to rid Earth of aliens. Squire doesn’t believe the aliens mean any harm, but when his mother and her pastor insist he apply to become a sex worker—the only thing the aliens have asked of humans—Squire sees a chance to escape.
Administrator Ghosha Progoni Rijal has reached the end of his rope when it comes to dealing with human politicians who would rather condemn than encourage free will. He’d known humans could be prudish about sex, but hadn’t expected this much pushback over a viable and highly-desired career choice. And then he meets a frightened, desperate young man who is his fated mate.
Believing he’s finally free, Squire also figures he’ll have no problem at all becoming a sex worker if his reaction to the big tiger alien who’s recruited him is any indication. Maybe Ghosha can be the one to train the virginity right out of him? But when Ghosha explains what Squire is to him, it’s pretty clear Squire has won the relationship lottery.