She is either his slave or his despot.

My hands are tied behind my back and there is a collar around my neck. Attached to that collar is a leash and attached to that leash is the owner of my submission tonight. He keeps me a step or two ahead of him at all times, pulling me around. He places various things in my bound hands, from his drink to a crop to his clothed cock. Every time I touch his cock he squeezes my arm and I gasp, catching my breath in my throat.
"I have a gift for you." He whispers into my ear. I smile, giddy, excited to see what he has brought for me. "You're such a good girl." His hands trail down my arms and I shiver, goosebumps blooming underneath his fingers. They land on the ropes around my wrists and begin to untie the knots. The ropes fall between our feet and his hands work mine, rubbing the marks and tingling finger tips.
I look around for my present, almost bubbling over with excitement but all I see is a large empty space with a few people milling around. He lifts my hand forward and extends his finger to a pretty girl, dressed in a lovely little black outfit. She is pretty but not generally my type.
"I want you to break her." He whispers. "She's a pain slut. Do whatever you like to her."
My chest swells. I am breathless with the idea. He has known about my sadist tendencies but never seen them. I want him to be proud of what his girl can do. His hands are on my sides and hips, squeezing them, warming me. I feel my nipples tighten to the point of pain. I hear the metal on the collar clank a little. "When I take off this leash, take her." I nod and feel myself get aggressive, animalistic. I start to growl softly in the back of my throat and I hear the softest laugh.
He reaches down and squeezes my cunt through my panties, and I'm already wet. I grind hard into his hand and he pulls me back up straight. He pulls off the leash, leaving the collar around my neck - letting me know I still belong to him.
The second it is off I am ready to pounce. I walk towards her in fast, gaping steps. She is staring at me with fear in her eyes and an excitement in her ragged breath.
I immediately grab her by the hair and pull her to the floor, putting her on her knees. She squeals a little and I tell her to shut the fuck up. She is on all fours and I pull her up so she is kneeling.
I begin to walk circles around her. I want her to feel like live bait. She swallows hard as I walk slowly, stopping behind her. I walk over and stroke her hair softly, teasingly. "Miss?"
I walk around her. "Open your mouth." She does and I spit, closing her mouth. "I told you to shut the fuck up." I slap her across the face hard. "Now swallow."
I grab her by the hair again and push her down. Her hands reach for the floor and I stop. "No. Hold you hands behind your back." She does and I force her to lean down, holding herself up just by her own strength and will. I reach down and dig my nails into the flesh of her ass. She whimpers and I begin to spank her hard, landing smack after smack after smack on her ass. I pound her ass red, feeling the skin warm and swell. I use both hands until they ache, and keep pushing until finally she cries out loudly. I smile and stop.
"Get on all fours." I sit on her back, straddling her like a backwards pony. "I thought you were a pain slut." I spank her once. She cries out. "Count." I spank her again and she whimpers out a 'one'. I smack her on the back of the thighs and she continues to count. "Tell me what you are in 3 words."
"I'm a slut."
"Four words."
"I'm a dirty slut."
"Five words."
"I'm a dirty fucking slut."
"Seven words."
"I'm a dirty fucking cunt rag slut."
"Now tell me that every time you get smacked from now on."
She screams it as a hit her ass, her thighs, the bottoms of her feet. She screams it as a grab her hair and pull her back onto the floor and spread her legs, slapping her inner thighs in stinging swipes. She whimpers it as I begin to slap directly onto her pussy, which is already wet. Every smack ends with my fingers pushing into her clit, making her push forward for another hard whack.
"Do you like that?" She nods, whimpering. I spit on her and smack her again harder. She cries out and then moans as I more forcefully rub her clit. "Do you know why?" She shakes her head. I spit and slap harder, grinding the palm of my hand into her clit. "Because you're a dirty." Smack. "Fucking." Smack. "Cunt-rag." Smack. "Slut" I pull her underwear aside and shove two fingers into her, fucking her hard and making her cry out.
I pull my fingers out of her. "Shut the fuck up, cunt." I look back at him and he is watching calmly, hand over the hard cock still in his pants. I smile at him and he smiles at me, nodding. I lick my lips as I watch his hand move. I turn back to her. A man is standing nearby with a drink and I wave him over, taking the drink from his hands. I grab her by the hair and drag her over to kneel in front of me as I sit in a chair and slide forward. I pull off my panties and spread my legs. I am soaked. "You know what you're good for."
She nods and goes in hungrily, licking and sucking my clit, her tongue pushing inside me. She leans back and uses the tip of her tongue and I take the opportunity. I pour the drink down over my clit and she laps up vodka and cum in gulps. Her makeup is smearing, black running down her face. I finish with the drink and pull her hair back to slap her. "Lick the rest off the floor."
She goes to work, her tongue licking and dabbing. I pull the lime out of the glass and push her on her back again, squeezing the remnants of lime juice in the wedge onto her cunt as I kneel over her. I slide up to her face and begin to rub my clit, pushing fingers into my pussy, dripping vodka and cum into her mouth as I get closer and closer to cumming on her face.
I look up and he stands, walking over to me. He gets behind me and violently shoves me down until I am on all fours over her. He pulls out his cock and without a word or a hesitation, shoves it inside me. I squeeze my pussy around it and moan loudly as his fingers find my clit and start to work it roughly. His cock swells and I push hard back against him. I squirt onto her face, and she moans, watching his cock pound me from only inches away. He is fucking me relentlessly, and I am so close I can feel blood running through my veins and under my skin. He can tell I am getting ready to cum, and pulls me up by the hair, putting a hand on my throat. He tightens and I am immediately light headed and caught off guard. I finally whisper "Please?" Choking out one word in place of a real question.
"Yes, cum for me. Cum all over her face."
I scream out, cumming hard all over his cock, cum dripping down onto her pretty, mascara smeared face. I have not earned his cum yet, that will wait for later. He pulls out of me and lifts me onto his lap, letting me curl up. I tuck my face into the crook of his neck and whisper into his ear. He laughs and nods, looking down at the girl.
"She said, 'don't fucking wash your face'." I smile and thank him. The girls gets up and I hear her ask if she can say thank you but he waves her off. She is gone and his lips move to my ear. "Good girl."