Baby for the Serp General by Aurelia Skye

She’s his reluctant captive, but can she become his willing mate?

Captured rebel Natalia expects to be executed, not claimed as a surrogate by General Zath, a fierce Serpentine alien. While wary, she’s intrigued by his unexpected care and eventual admission he desires her as a true mate. Torn between lingering distrust and her growing feelings, Natalia must decide if she can abandon her cause to find love in the enemy’s arms.
Seven years ago, the Faction agreed to save Earth from the vorathan invasion in exchange for Earth women giving them one year of proxy rights to act as a surrogate, since the aliens of the Faction faced a dwindling population. With the vorathans feared throughout the galaxy as bloodthirsty, vicious marauders, the Earth’s government agreed.
That doesn’t mean the women did.