Accordingly, I lowered myself gingerly onto the sofa and pressed back into it, trying as much as possible to keep my weight on my shoulders and back rather than my bottom. As my Master and Sue sat opposite me, I slipped my hand towards my shaven pussy and began to stroke myself. It was hard, because my pussy lips were sore and swollen from my beating. Fixing my eyes firmly on Sue, staring her out, refusing to lower my gaze, I began to play my fingers on my labia, biting my tongue to overcome the pain. I hoped my show of defiance, my lack of deference, would not be punished, but I was adamant, in any case, that I wouldn't buckle.

If they wanted a performance, I resolved, then I would give them one. I gripped my right nipple with my left hand and began rolling it, squeezing it, nipping it hard. Instantly, it began to swell and stiffen, erecting to about half a centimetre in length. I had one leg tucked underneath the other, but I adjusted my position and opened both legs wide; spread wantonly for them, my entire pussy on display, I continued to wank myself, never letting my gaze move from Sue. Strangely, I found strength in this deeply subservient position, as though by subjecting myself to this routine humiliation I assumed superiority over this fickle woman before me. I pulled hard on my nipple, and dug my nail into it, forcing myself to conquer the pain.

My Master had a curious look on his face, as though he discerned a change in my demeanour, but I was largely ignoring him. Sue was watching me intently, her breathing short and shallow; her look mingled amazement, disgust and excitement, but I didn't care what she thought. My fingers plied their trade on my pussy, rubbing sensuously up and down the outside and inside of my engorged lips, picking up the slickness of my fluids and sliding easily against my hot and excited flesh. I ached where the slipper had hit me, but my rising excitement was allowing me to overcome the pain. My clit was prominent, free from its protective hood, and my thumb grazed distractedly against it, sending waves of heart-juddering excitement through me with each pass.

I dropped my left hand from my breast and slipped it over my pussy, sliding my fingernails down my outer labia and resting against my thigh. I stroked my middle fingernail against my skin, exploring between the base of my crack and my backside, running up and down the tender, sensitive nether area. I took my finger in my mouth and rolled my tongue around it, wetting it. Fixing Sue with a penetrating stare, I pressed the finger against my arsehole and began to push, feeling it slip inside me. Deeper and deeper I pushed, until I was in to the knuckle. As my finger began to probe and experiment inside my arse, the combined fingers of my other hand were bringing my pussy to a height of excitement. Faster and faster they tickled, stroked and thrust against my pussy lips, sliding deep inside me and drawing out again, all the time my thumb beating a steady tattoo against my maddened clit.

Suddenly, with a jaw-shattering explosion within me, I came, pulses of nervous excitement cascading from my womb all over my body. Still staring at the woman, I let the climax engulf me, gave myself over to its intense and personalised sensations of tormented delight. My finger, probing in my arse, added to the welter of sensations flooding through me, and I shivered and shook for upwards of a minute, given over to an astonishing experience. With utter defiance writ large on my expression, I faced Sue down.

She looked very red in the face, and for the first time the look of composure and arrogance had left her.

"Wow," she said, at last, her voice satisfyingly (for me) hoarse. "That was something else, bitch. Very impressive."

My Master bristled immediately. I sat immobile, fingers still in their respective orifices. "As you say," he replied, "that was something else. A stunning performance. Harriet, however, is my slave, my personal slave, and she is a very important person to me. She is not a bitch, and I will not have her referred to as such."

A wave of love for my Master flooded through me. How I had hoped he would say something like that. Sue looked distinctly taken-aback, completely wrong-footed.

"My apologies, sir. Of course, you're right, and I withdraw that remark. Harriet," she looked at me, an insincere smile playing about her lips, "please accept my apologies."

I nodded. Freeing my hands, I looked to my Master and he smiled his assent for me to leave. Gathering my clothes I ran upstairs. As I washed myself in the bathroom a few moments later I heard the front door open and close, and when I returned downstairs my Master was alone.

"Sit down," he said. "And explain. There was something very strange about that performance. You weren't at all yourself. That was the most violently aggressive piece of submission I've ever seen. And I've never seen such hatred in your eyes. Something has gone on between you two. What did that woman do to you?"

And so I told him.