Her Dragon Mate by Milly Taiden

A museum curator obsessed with an ancient dragon-worshiping culture meets a dragon shifter from that very time and place: too bad she has to tell him she’s not one of his devotees.
Rosalie Menendez is thrilled to unveil the latest exhibit in her Utah museum. She’s an expert in the ancient dragon-worshiping culture, and all of the rare artifacts are going to put her on the map. What she doesn’t know is that modern-day thieves are scheming to steal one object in particular and sell it to the highest bidder.
Liam Crucible—dragon shifter, Burner of Carthage, and Eater of Suns—awoke from a very long nap in a very bad mood. The Dragon Temple is interrupting his slumber, and it seems like a missing necklace is to blame. Since his brothers are busy strategizing, Liam decides to spring into the action. He’ll recover the item and show them why the oldest brother is still the best.
But when he tracks it to Utah, things go south fast—in more ways than one. Suddenly the necklace is gone and Liam is stuck in his human form—complete with an insatiable human libido. He’ll have to take a quick course in how to talk to women in the 21st century if he’s going to convince the raven-haired woman to help him. Luckily, Rosalie is worth learning for.