Don't make her mad: Dethroned dragon queen has a tyrant as her slave

Dragon Mother Bellona is betrayed at her own wedding and nearly poisoned by her sister. Burning her life force, she awakens the dragons, destroys the throne, and flees with a vow to drown the empire in fire. Then she buys a silent, chained slave—never knowing the “pet” in her hands is the bloodthirsty Winter Tyrant, who bound himself only to become her most loyal hound.