Dragonfire Warrior: Secrets of the Lost Dragons, Book 2 - Isaac Keyes

Lysander and Astrid had almost reached the end of their journey. Or so they thought. But the mysteries of the soul bindings and the lost dragons stretch far deeper than they imagined. The Empress herself, whom they thought their enemy, gave them their only lead. In order to follow it, they’ll bring the beautiful and enigmatic Vennicera into their plans, their lives, and their bed.