Prince of Ice by Terry Bolryder

Luka, the last unmated ice dragon, knows exactly how to win over the sassy, sweet scientist he fell for at first sight. He’s going to take it slow, let her warm up, and show her how hot an ice dragon’s kiss can be. All while hiding his identity. But when someone breaks into Iris’s lab, Luka’s careful plans are ruined, and it’ll take all his strength just to keep the dragon in him from unleashing on whoever is threatening his mate.
Iris Jensen has worked hard to become a renowned scientist in her field. Now that she’s about to get tenure, and the financial security she’s always longed for, nothing can distract her. Except maybe a man with beautiful, icy eyes that seem to stare into her soul and hands that are just perfect for holding her. But with someone threatening everything she’s worked for, she can’t let herself fall into Luka’s arms just yet.
Even though Luka wants to take things slow with his mate, the dragon in him knows he has to hurry if he wants to protect her from outside forces. Because Iris may be close to losing everything, and in the modern world there are some things even ice dragons have to fear.