My contracted beast turns out to be an ancient dragon!

あらすじ

She died once—betrayed by the centaur she raised and the junior she trusted. Reborn, she trades him for a dying black-scaled lizard, the beast no one wanted. But this lizard is no castoff. He's a dragon prince, and together they'll rise. While her ex-partner rots with her betrayer, she uncovers a plot to unleash an ancient curse. This time, she won't be the sacrifice. She'll be the hunter. And the dragon at her side? He's ready to burn the world for her.