Frost Mate by Elle Beaumont

He’s the captain, and she’s the trainee. Will a mission get in the way of their fated bond?

Captain Korreth spends his days training Morozko’s Army, wanting nothing more than to quash the Changelings as they wreak havoc on Frosteria. But when a new trainee enters the barracks, he feels an inexplicable pull.
New recruit Zira has one thing on her mind, and it’s taking out the Changelings that slaughtered her family. She’s full of vengeance, but she can’t deny how difficult it is to focus in the presence of the captain.
With tensions rising in Frosteria and the mortal world, Korreth and Zira must work together, however, it will take the strongest of wills to ignore the call of a mate bond. That is, if they even wish to.