Severus practically snarled when she bit him, his hand darting out quickly and grabbing hold of her by her hair, twisting the curls around his hand multiple times so he had greater control over her. He'd quite happily wrench her hair out by the root and all he could think of was great violence towards her. He'd always known she was borderline feral but this was ridiculous.
"Bite me again and I will knock out your teeth." His tone was authoritative and dark. He was completely serious. He had no care or consideration for her as a human being. He hated her and she was lucky he hadn't already slammed her face first into a wall. He swept his foot forward, booting her in the back of the knees at the same time as yanking at her hair. She'd fucking bitten him, he was beyond the point of being a well composed gentleman. This was the death eater, the boy from the wrong side of the tracks, the killer.