For King and Corruption by Kel Carpenter

After five months of journeying across the continent with her sister, Quinn is finally ready to return to the king she swore to serve.
But war has been brewing over Norcasta in her absence. While Lazarus may reign as king, there are those that would see the blood heirs in power instead.
Quinn, however, will never let that happen. Her brutality threatens to drive a wedge between her and those she cares about, but they should know she would do anything to protect them.
Caught between the wills of his Left and Right Hands, Lazarus must navigate the pit of vipers that is his court and decide what sort of king he wants to be. But when Quinn pushes too far, she ignites a series of events that will either cement his rule, or destroy House Fierté entirely.