Fallen for the Two-Headed Dragon by Delilah Dare

Dana’s 3-year relationship ends on a high note when she reminds her boyfriend that she doesn’t want kids, to which he responds by shoving her off the mountain. She tumbles down the staggered cliffside and rolls into a bear cave.
Taken by surprise, Rathym watches her scramble away. Every fiber of his being demands him to pursue her, but the enchanted letter from his homeland will fade away at any moment. There’s been a break in the case of his closest friend’s assassination. Rathym shouldered the weight of responsibility for his friend’s death two centuries ago and had subsequently isolated himself, the best way he knew to keep his loved ones safe. He will not miss the murderer’s reckoning.
As a 5-centuries-old dragon who strictly follows tradition, he knows she now belongs to him. He will not allow his most enrapturing treasure to stray very far. When Dana is inevitably dragged back to his lair, Rathym battles the unnatural desire to take her as his mate. If his homeland has embraced interspecies mating, why is he still so afraid to open his heart?
While her grouchy captor tends to her wounds and lavishes her with gifts, Dana starts to rethink the polite life she’s always known. She’s spent too much time putting off her passion and shrinking down to fit into safe little boxes for the benefit of others. It was time to choose herself.
As they both fight their battles for justice, she sees a gentler side of the ancient beast and wonders if he’s been right all along. They do belong together.