Falling For A Psychopath [BNHA]

She looked up at me through long dark lashes a soft demure expression on her angelic face, "if you're going to kill me...c-can I make a request?" Her voice didn't sound nearly as shaky as it had before. Perhaps she'd accepted her fate.
I looked down at her waiting for her to continue.
"Look me in the eye." Once more, I thought I saw a flicker of a smile on her lips but it was gone the moment I focused my attention there. That seemed like an odd request.
"Alright." I nodded and held her glowing gaze. My resolve was starting to slip. This didn't feel right, something in me didn't want to kill this girl.
As if she sensed my resolve beginning to waver, she offered me a meek smile, "if it's any consolation, I promise I won't haunt you."
My hand felt a little unsteady. Why was this so difficult? I grit my teeth and tightened my grip on the blade. I couldn't fail this test. I drove the blade into her chest and felt my blood turn cold as her lips pulled into a maniacal grin. Her thin corpse complexioned hand encircled my bare wrist. How the hell did she get loose? She gripped my wrist tightly forcing me to drive the blade deeper into her chest.

Overhaul X OC

Also this entire story will most likely take place before the series begins. (we'll see how things go)