Desired By the Beast by Evangeline Anderson

A curvy queen. A warrior on his knees. A mission that might break them both.

Kaitlyn Prior is finished playing nice.
Divorced, restless, and craving something darker than vanilla, the curvy, mature Kindred Ambassador wants control in the bedroom—power, intensity, a man strong enough to kneel without breaking.
She just never expected that man to be her massive Beast Kindred Protector.
Braze is lethal–an Elite Alpha warrior with a brutal past he’s sworn never to reveal.
Long ago, he was captured on Yonnie Six and trained to submit to a Mistress. He buried the memories, buried the shame…and buried the part of himself that aches to kneel again.
Then he and Kaitlyn are sent to a female-ruled planet where wives own their husbands—and to secure a critical trade treaty, they must pretend to be married.
But on this world, obedience isn’t just symbolic…it must be proved.
So when the Empress demands proof of Braze’s devotion, Kaitlyn must decide whether to command her Beast… or lose him forever.
Because the most dangerous secret of all?
This Beast doesn’t want to dominate…
He wants to surrender.