I was insanely jealous, of course, and no little upset. Over the course of those days my status, already lowly, was reduced yet further until I was a bit-player in my own life and my own needs, to which my Master had previously been assiduously attentive, were being neglected. I was reduced to furtive fumblings in the toilet, sneaking around my own house for a secluded spot and secret moment in which I could relieve the pressure building up inside me. It was inevitable, I suppose, that I would be caught.

I was lying in the bath one afternoon, idly toying with myself. Nadia and my Master were both out and I was taking the opportunity for a spot of relaxation. The water was piping hot and very full, and I was stretched dreamily in the bath, completely covered up to my neck. My legs were parted as wide as the confines of the bath would allow and my hand snaked around my pussy, fingers stroking up and down my puffed and sensitised lips. My clitoris felt as though it were on fire: the combination of the only-just bearably hot water, the days of pent-up frustration and the attention of my middle finger was causing a combustible build-up of sensations which I struggled to contain. Gasping and panting, my eyes screwed shut, I grazed my nails up and down my lips and struck a steady, rolling, cajoling rhythm with my first and third fingers while the middle finger flitted intermittently across the surface of my clitoris, fuelled by the darts of pained pleasure and becoming ever more daring, more strident. I was sailing close to the edge, my mind detached from my body, plotting its own course through the choppy, frenzied waters of excitement towards the goal of satisfaction.

"Having fun?"

I started almost clean out of the water and opened my eyes in alarm. There, at the bathroom door, her hand resting insolently on the top edge as though to prove how much taller she was than me, was Nadia. She had an imperious look on her face, and I could not divine whether it was condescending, amused or disgusted. Somehow, she managed to turn her expression into a glorious mixture of all three.

I could not deny what I was doing. My face and neck, I knew, were flushed far beyond the invigorating blush caused by the heat of the water and my guilty fingers were still resting on my labia, even, despite my exposure still scratching distractedly against them. I felt a sweep of shame descend on me, my brow dampened cold with horrified embarrassment at my discovery in such a compromising position. To be reduced to this, caught while seeking solitary solace in the bath while my bed was occupied by another woman and my position as sexual partner usurped, was humiliating in the extreme.

"I 3; I didn't know you were back."

"Clearly."

She turned on her heels and walked out. Breathing a sigh of relief, I took this as a sign that she was going to take no further action. Deeply embarrassed and frustratingly unsatisfied, I quickly got out of the bath and dried myself off. Slipping into fresh clothing, I stepped cautiously downstairs.

Nadia was in the kitchen. She nodded to the kettle. "Coffee," she said, and I busied myself making her a cup.

"Looked like you were having fun," she said. I didn't know how to answer.

"Yes, Mistress, no, yes, I mean 3;"

"Make up your mind."

"I 3; I just needed some relief," I blustered. "Last night, watching you with my Master, I was offered no chance 3;"

"Are you telling me we aren't looking after you properly?"

"No, Mistress," I cried, immediately aware that I was straying into dangerous territory.

"But you're not satisfied?"

"Yes, Mistress, I am. I'm very happy, honestly. It's just sometimes 3;"

"Yes?"

I was speechless, terrified to continue for fear of saying the wrong thing and making my predicament worse.

"Well, since you've been here I haven't had much chance to, you know 3;"

"How coy you are, little Harriet. You mean you haven't had a chance to come?"

"Yes, Mistress," I sighed, defeated.

"Well we shall have to see what we can do about that. Did you finish yourself off upstairs?"

"No, Mistress."

"Well, do it now."

I remained silent, rooted to the spot. I had had to do this the other evening, standing by the bed as my Master and Nadia cuddled under the bedclothes, watching. Somehow, though, this seemed even worse. Then, at least, it was the culmination of a session of joint lust and sexual activity, which I was forced to conclude alone. But to be asked now to service myself in isolation, cold, in front of Nadia's cool and calculating view, was taking my humiliation to new depths. I knew there was no point in arguing, however, and lowered my jogging bottoms to the kitchen floor, stepping out of them and sliding off my panties.

"Can I sit?" I asked, looking at the kitchen chairs.

"No, kneel on the floor, on all fours, like a little doggie. And take off your top too, I want to see your little breasts swaying." My ears burning with shame, I did as I was told and stripped my cotton tee shirt off before dropping onto all fours. "Okay," Nadia said, "finish what you started upstairs, you randy little tart."

My head bowed, I began to play with myself. Shamed, I realised I was already damp and my fingers played easily along the length of my labia, finding an easy rhythm. With tears in my eye, I knew I was excited and despite myself I was turned on by what was happening to me.

"Look at me," Nadia told me. As she sat on the kitchen chair in front of me, I looked up at her like a dog at the feet of its Mistress, awaiting praise. My fingers scratched at my pussy, rolling distractedly over my clitoris, scratching at its protective hood. I could feel the sensations well up inside me, rising, rising, growing, pulsing, searing through me. My legs tensed, knees aching against the hard, cold surface, and my gaze locked onto Nadia's. Her lip curled into a triumphant smile as she watched me abase myself at her feet, watched the climax rip through me, watched my body shiver and shake as the tremors fled through it, up and down my spine, into my brain, through every nerve and fibre. I screamed as the moment reached its zenith and Nadia laughed.