Devil On Earth by Angelina Avery

An Elysium Warrior’s pull is legendary, used to entice willing females into their arms. Too bad Tarian’s mate is an emotionally unavailable geneticist.

Bree doesn’t believe in fate or destiny, and she’s allergic to anything resembling a relationship. When she’s tasked to be the lead geneticist for the Elysium mate program, she harbors more than a few misgivings. After being targeted by a hate group, she’s forced to relocate to a remote military base…
And triggers the Elysium Ambassador’s mate bond response.
Tarian, son of Koath, is determined to protect Kyllell and Ada by uncovering the Chassak infiltrators. When his brother assigns him to run security for the team of scientists working on the mate program, the last thing he wants to do is leave Elysius. But when he arrives at the military base, he has an entirely new individual to protect…
and his horns burn black for her.
Bree is completely resistant to his charms, but Tarian is determined to keep her no matter the cost. To complicate matters, a traitor waits for the perfect moment to destroy the entire program and kill his mate.

Can Bree and Tarian uncover the key to saving the Elysium race before their enemies’ attack?