Vicious Knight by Amaya Black

I struck a deal with the devil…
There was no way I could let my brother die, so I traded myself for him, to save his life.
My actions changed my entire world.
Lucien Petrovich is an emotionless killing machine.
He’s a real life, walking and breathing nightmare.
Everything in me screams to not give in. To fight him, to never let him have control.
But then I begin to wonder, could a man as vicious as him, ever be gentle and show emotion?