Heat by Donna Grant

He knew her round eyes and the deep shade of brown along with the band of black that encircled her irises. He knew the slope of her breasts, the indent of her waist, and the flare of her hips. He knew the way she preferred to wear muted colors to help her blend in with a crowd. It had taken one look to put all that to memory, but he found his eyes going to her again and again, as if he couldn't get enough.
Nikolai is a dragon shapeshifter who knows well the meaning of loss. Orphaned and raised to be a Dragon King, he never accepts defeat. Now, Nikolai prefers his solitude. . .until a beautiful, irresistible woman calls upon him for help—and Nikolai's whole world goes up in flames.
Ever since MI5 agent Esther woke to discover her mind taken over with magic, she feels like a stranger to herself. She looks to a notorious dragon, one who has the power to help her find her memory. But as she and Nikolai come closer to discovering what really happened to her, a dangerous passion ignites between them. Can this lone Dragon King help the woman he's grown to love to uncover the truth about her past—or will a deep and fiery danger tear them both apart in Heat, the next Dark Kings novel by New York Times bestselling author Donna Grant.
The Dark Kings series is:
"Provocative [and] sizzling."
—RT Book Reviews (4 stars)
"This series is a must-read."
—Night Owl Reviews