Her Two Dragons by McKenzie Rogue

Two dragons, torn between duty and love.

Prince Darius and his guard, Khalid, are only at the Egyptian archeological site for one reason—to keep humans from discovering dragon shifters.
The only problem is, both men quickly find themselves easily distracted by the curvy, sassy, tough-as-nails Michelle. She’s certain there’s a mythological artifact hidden in the dig site: The Obsidian Moon.
The ruins under the sand hold secrets that neither shifter could’ve anticipated, and the closer Michelle gets to uncovering them, the more at risk the whole Lapis Lazuli Clan is.
When both their heartstones light up, Khalid and Darius have a choice to make. Honor their king and clan or throw caution to the wind and claim her… Together.
They need Michelle’s help to solve the mysteries of the underground structure, but even more than that, they both need her.