Tokalas by Juno Wells, J. S. Wilder

Tokalas was Catherina’s weak side, her primary protector, and trusted bodyguard. Catherina had started working on the Dating Agency and had found Tokalas, a mate. He had fought hard to resist his feelings for Henmop.
But in the end, the alien had a choice to make. One was his duty as a bodyguard, and the other was love. This short story tells his story and how Tokalas finally opened his heart to love.