The Beasts That Bleed Us by Erin Mainord

A bloodwitch scorned.
A beast betrayed.

After recovering from a dark turn of events, Wren and Sin are more committed than ever—both to their kingdom, and to each other. But before vows can be sworn to either, they must face the harsh reality of what is waiting for them on the opposite side of the isle, and on the continent across the sea.
When a meeting with the foreign king goes awry, Wren grows suspicious that a dark magic may have their every move being watched. Desperate to protect her loved ones, Wren must reluctantly scheme behind the backs of her allies—including her betrothed’s. But when the Black Art senses he is being double-crossed by his intended, the result may prove to be more devastating than the war they face.
As battles grow bloodier, the shifter king’s temper grows concerning, and the strings of Wren and Sin’s newfound trust are plucked as both struggle not to slip into damaging past habits. With new threats emerging around every corner, it is more important than ever that these lovers keep their daggers aimed at their enemies… not at each other’s throats.

Love is a savage magic, but it may just prove to be this couple’s most destructive weapon yet.