Finally, they stripped themselves naked and fell on to the bed - Sue's bed, with her cuckolded husband Norman - launching a sustained oral assault on one another. Sue's hands were hooked onto Ian's back, her long nails dragging painfully against his skin, raising livid red marks from his shoulder to his arse. They rolled over and over, almost comically, like actors in a bad sex film: people don't do that, I thought, it's too tiring with too little reward. On and on they went though, like demented Duracell bunnies demonstrating their stamina. From my vantage point I was curious to note that even in such an intimate setting body language can give itself away: Sue was far more ardent, more sustained, more sexual in her assault on Ian, who seemed to me to be almost distant, by no means an unwilling participant - his fairly impressive erection gave the lie to that - but less connected with the moment than Sue. My guess was that this was an affair instigated by her and designed to feed her craving for control, her need to take risks to satisfy her manipulative character. I almost felt sorry for him, getting involved with this lamia.

Truth to tell, though, he didn't appear to be in need of my pity. Sue was astride him, her hand reaching behind her and gripping his erect cock, stroking it vigorously. Lowering her upper body she dangled her breasts tantalisingly in front of him, almost, but not quite allowing a nipple to enter his mouth, swaying them provocatively and laughing cruelly at his attempts to grab them. Finally she dipped forward and planted her left breast over his mouth, permitting him to suck on her swollen, hard nipple. She flattened his prick against his pelvis and ground her palm over it, crushing it against his own body. His mouth full of tit, he could make no noise but he screwed up his eyes in pain and his hands clenched and unclenched repeatedly. Sue laughed again at his discomfort and pressed harder, sliding her palm down over his balls and exposing the furious purple head of his engorged cock. A glistening sliver of pre-cum oozed from his eye. Sue spotted it and immediately gripped the base of his shaft, squeezing it tight and forcing another droplet to slither from the helpless man's solid prick.

She grunted and slid herself down his body, holding his dick down out of harm's way, and rested with her cunt atop him. She grinned and pushed herself down, rolling her hips and sliding up and down his length, rubbing herself on him, pressing her clitoris hard against him.

"Her," Ian snorted, pointing at me, indicating for me to approach. His eyes met mine and I saw an expression I could not fathom - was it empathy, or understanding or just plain lust? I had no way of knowing.

"Fuck her!" scoffed Sue dismissively. "No, in fact, fuck me." With that she raised herself and, gripping his cock and pointing it upwards, slid herself onto him. She paused for a moment before grinding herself down emphatically onto him, shrieking as she felt his length enter her. He was quite an impressive length, in fact, and he would have undoubtedly made his presence felt. She began to buck and ride above him, abandoned and self-centred, focussed only on her own narcissistic needs and oblivious of the man beneath her. In truth, he was every bit as much her plaything as I had been, just as much bound by her lust.

On and on she bounced, her neck reddening and the excited blush spreading down her body in brutal blotches. She grabbed Ian's hands and swung them over his head, spreading them wide and holding them in place as though in bondage. Her hips swung and rotated ever faster as her climax built. And still they went on, minute after minute, their actions growing ever more frantic.

"I'm coming," she screamed, "Come now, come now!" She grabbed his nipples and tweaked them painfully, thrusting herself furiously onto his cock. Slipping her hands down to her cunt she began to stroke her clitoris, her back arched and head raised heavenward. She screamed as her handwork launched her climax and flexed herself desultorily on top of Ian. Her fingers stroked and clawed at her pussy and clitoris, and her muscles clenched with the tension of the moment. Her eyes were screwed shut and as she concentrated on her own sensations she had all but stopped riding above him; I doubted whether he was getting enough stimulation to trigger his own climax and, indeed, he was whimpering helplessly beneath her. Finally, once her orgasm had subsided, Sue began to roll slowly above him again, rocking her hips and raising herself up and down emphatically on his slippery pole. After a moment of this attention, with a groan Ian tensed his body and shot his load inside the grinning Sue.

"Oh God," he said, his voice trembling, "that was incredible."

"Yep, pretty good, lover boy," Sue crowed. "For starters. There's more where that came from."

"Oh God, no, not yet." He wiped perspiration from his brow melodramatically. "Let me get my breath back."

"No time for that, lover. You have to take your chances when you can. Norman'll be back in a couple of hours. That gives us 90 more minutes to play. So get that thing ready again, I want more."

She had slid off him and was lying beside his prone body, her fingers scratching at his hairy chest. Suddenly she lowered her hand to his cock and gripped it hard, causing him to moan in pained pleasure.

"Okay," he said resignedly. "Tell you what though, how about getting that little slave girl over there to get me ready again."

Sue turned to me, a wicked look in her eye.