Theodore by Kathi S. Barton

Pembroke Black had always had a lot on her plate. As a child, she could not tolerate her father, and Pem had moved in with her grandparents when her mother died. When she was old enough to move out, she joined the Army and served the front lines as a doctor. Stitching people up was what she did best. Coping with her own emotions was another story—Pem found little joy in this world.
When Pem’s grandda passed away, Theo Manning was there to help Pem’s grandma any way he could. That included keeping grandma safe. He had no idea until he met Pem that she was his mate. Theo wanted to protect her, too, from what was to come. Pem only had to touch his hand to receive the magic coming to her, but neither had any idea how much magic would flow between them.
Pem had always had her emotions take her under at times, but this was nothing like that. She was happy. She felt better than she had in years. Pem only hoped that Theo would not rush her. There was just too much going on for her to deal with a pushy man.