The Savage Vow by Ariel Marie

A forbidden bond. A savage vow. A mate she will not surrender.

Nargol Cydassi is the chieftain’s shadow—spy, blade, and the weapon unleashed when loyalty falters. When a mob revolts against the ruling family, she is sent to uncover the traitor before unrest spreads into war.
She expects lies.
She expects blood to be spilled.
She does not expect fate.
Orlena Blackwell is human—an outcast apprenticed to a master who will never see her as equal, tolerated among orcs but never truly one of them. She has survived by keeping her head bowed and her heart guarded.
Until a drifter looks at her—and something is awakened in her.
Fated mates are sacred among orcs.
But humans are not.
As Nargol uncovers a conspiracy that threatens the foundation of orc rule, enemies begin moving closer. Whispers turn into warnings. And the presence of a human at her side becomes a liability.
Anyone who mistakes Orlena for a weakness will learn just how wrong they are.
Because Nargol’s loyalty to her clan is iron.
But her devotion to her mate is something far more dangerous.
To claim Orlena, she must defy orders and risk becoming a weapon turned against her own people.
Some vows are sworn in honor.
Others are carved in fury.