Jace by Tasha Black

This grumpy soldier wants to guard her life, but she only wants to guard her heart.

Jace’s glorious career as an Invicta warrior is cut short when he is assigned guard duty for a tiny alien baby. Just because he’s a glorified nanny for the frustratingly irresistible little bundle, doesn’t mean he has forgotten his duty. But when the baby’s adoptive mother shows up, his heart and libido are both thrown into a hurricane of need swirling around the little Terran.
Susannah is leaving her home world to find peace and love by adopting a baby. She expects the two will live alone on the frontier, far from any man she could inadvertently fall for and harm with the curse that was placed on her years ago. When she finds out the achingly gorgeous and dead serious guard who delivered the baby will be living with them, she isn’t sure how she can resist their mutual attraction.
When strange things begin to happen on her land, she and the burly warrior will have to work together to solve the mystery and keep baby Zeke safe. And every dangerous situation seems to wind her up in his arms.
Jace can tell she’s desperate to resist him. But his frantic need for her weighs more and more heavily on his heart.
If they want to start a life together, this serious pair might have to find a way to lighten up