Destination Alien Mate by Dee J. Holmes

Kimani Jones is determined to uncover a criminal conspiracy at Yellowhammer & Co., only to discover a bodysnatcher invasion. And that’s before an alien warrior smashes through a window to take her on the joyride of her life.
The intergalactic badass insists she’s his mate. But she won’t abandon her town to the parasitic invaders—even if her smoking-hot blue bodyguard is making her second guess her commitments.
One of only five surviving Apex’ir warriors, Gladius has vowed to hunt his infectious enemy, the Fever. They corrupt the local population, and he’ll destroy every drone in his path. So when his brother demands he rescue a human woman from a backwater settlement, he despises the distraction. Until he sees Kimani, and every protective instinct in his body is set ablaze.
Locked inside his helmet, Gladius knows only his fated mate can set him free and give him a future. He’s sure Kimani is the one. He’ll stop at nothing to claim her—that is, if the Fever haven’t already infected her. Because she’s hearing their voices in her head, and she might be a trap.