Chromium Dragon by Terry Bolryder

Chromium, the last unmated dragon guard and former royal bodyguard of the Drakkaris court, has a secret. He’s been sneaking out at night to serve vigilante justice and taste new things in the human world. When he runs across a curvy restaurant owner with a sweet personality and a lasagna to die for, he knows he has found his mate. Now he just has to stay in her world long enough to protect her from those who want to hurt her.

Helen hasn’t had a lot of easy breaks in life, but she works hard to help anyone she can. When a mysterious, hot customer stops her restaurant from being robbed, she’s happy to offer him a place to stay, even if she doesn’t know anything about him. Well, except that he’s tall, with Caribbean blue eyes and a warrior’s bearing, and seems utterly intent on winning her heart.

As Chromium fights to keep his secret from his friends, he is realizing more and more that he can’t bear even a moment away from Helen’s side. All he wants to do is pleasure her, love her, and show her who she belongs to. But Helen has secrets as well, and a past that may just be coming back to hurt her, if Chromium doesn’t watch out.