The Guardian

Vesta, The Guardian of helpless species, is completely smitten when he's assigned to take care of the unconscious and ovulating human friend of Kele Frey. A brilliant idea erupts. Get her with child, and she'll be forever his. 
Bay Walters wakes up to the most amazing man she's ever seen. She gives in to her wild side before she discovers he's the kindest, most loving soul ever. He certainly doesn't deserve the entrapment she's doled out with her pregnancy. 
Now that a threatening alien species has emerged, he'll have the most important Guardian job of his existence. 
His own child.