Crown of Daggers: A Dark Romantasy of Forced Alliance, Blood Oaths, and Dangerous Magic (The Severed Crown Series) by Sable Corwyn

A queen who bleeds for her throne. A rebel who can shape her power. A blood oath that makes desire treason. Queen Sera has kept Veldrath alive by feeding years to the Obsidian Throne. Every warding costs blood. Every visible weakness gives her enemies another reason to call her unfit. When the kingdom's wards begin to crack in public, the one man who can read the damage is the rebel lord she was supposed to execute. Kael Dain should be dead. Instead, his bone magic gives shape to what Sera's blood can only fuel. Binding him with a blood oath keeps him useful, contained, and visible to every courtier waiting to call her compromised. It also ties them wrist to wrist, pain to pulse, secret to secret. The oath was meant to save the kingdom. It was not meant to make an enemy understand the cost of her throne. It was not meant to make desire answer through stone. As the Veil moves south and the court turns every touch into evidence, Sera and Kael must do the one thing neither has survived by doing: trust the person who has every reason to ruin them. Alone, Sera can bleed. Alone, Kael can hold a shape. Together, they may be the only force strong enough to stop the old magic beneath the crown from opening. Read more