Take her over your knee and spank her

Climbing off of her, I tell her to be still while I got to the bathroom and clean up a bit. Coming back, I pause, smiling at her submissive, kneeling form,one hand between her legs rubbing her swollen lips.
"Who told you you could touch yourself, bitch!" I snap, grabbing her hair, and jerking. She gasps,eyes wide in terror, hands grabbing my knees.
"I'm sorry master, don't hurt me..."
Brushing her hands away rudely, I shout, "Heel!" and she lowers herself again. I sit on the edge of the bed looking at her, face flushed, eyes trying to look at me, without me noticing. I smile, "You are such a filthy slut, aren't you?"
"Yes sir, I'm sorry Master..."
"You're forgiven, but you will have to be punished."
"I know..."
"Over my knees."
"Sir?"
"Over my knees, cunt, I'm going to spank you."
"Oh...." She climbs over my lap, her stomach pressing against my cock, legs together, hips wiggling a little. I take both her hands in one of mine, pull them behind her back, holding them there, rubbing her ass, "So sexy..."
She moans, "Sir..."