Whisper of the stone heart

Dotoria, a world characterized by many races and species, especially the existence of a magic stone with great powers. Neldrisdyd of Mizenth is the Duke of one of the greatest large empire in human history, while Dahlia is the last survivor of a tribe that was the main protector of the magic stone.
Neldrisdyd inherited the dragon blood from his mother, and after returning from his seclusion, he came back as a full blood dragon, not as a hybrid. His only goal became to claim back the kingdom the dragon race had lost, believing humans had schemed to win the war that happened thousand years ago.
When she thought she would meet her demise, Dahlia was enslaved and bought by the Prince to find herself as the Fake Princess taking her place, being told the queen missed her dear dead daughter. She learnt the harsh reality of the world the hard way, slavery, cruelty, regret, pain, hypocrisy...
"Do I have to believe you do not know my name?" Neldrisdyd said to the fake princess.
"Of course," she hesitated, "I was absent for two seasons because of my illness. Excuse my lack of knowledge, Duke of Mizenth," she remembered the most important names she must not forget.
Especially, Neldrisdyd of Mizenth, she had the mission to seduce him to bring him to the side of the imperial family. His Dukedom was not a matter that should be taken lightly. While they had the same goal in their mind, they did not know they were secret allies. To only be reunited by the whisper of the stone heart.