"If you want to."
Another slap, this time on the other cheek. "It's what you want, isn't it?" When there was no reply he administered several more smacks. "Answer me."
"You know."
His hand rose and descended again. And again. "So tell me."
There was a long silence broken only by the sound of his palm impacting on silk-covered flesh. "Tell me."
"I want you to smack me."
"Where?"
"On my arse." She was fully into the game now, possibly so involved that she was oblivious to our presence. The cool, controlled Katherine who had arrived less than an hour ago with such self-awareness had given way to a woman who couldn't conceal her raw desire. "Smack my arse. I want it."
While Petruccio applied himself to stoking his wife's fires I could only admire the calculated skill with which he administered the punishment: never so severe as to be unbearable but positive enough to achieve its objective. At the same time, Anna was her usual attentive self, recognising the moment to stop sucking and instead to pinch the base of my cock. We were no longer detached observers. We were involved and the erotic temperature was rising by the minute. Too much too soon would spoil everything.
Time to move on. Anna got to her feet and lifted Katherine from her position across her husband's knee and took her to the bed. "May I?" she said, slipping her fingers into the waistband of the woman's knickers. Without waiting for an answer, she slid the garment down those long shapely legs and dropped it to the floor. The suspender belt and stockings remained in place. Katherine was passive, making no protest as she adopted a prone position on the bed. Her buttocks had a rosy hue but no damage had been done.
"That's very nice," said Anna, exotic foreign accent coming through. "Such a beautiful arse. So lovely, I have to kiss it." The kisses were soft, fluttering from cheek to cheek as Anna also used her hands to caress and fondle the roundness. Petruccio and I leaned close to watch. He was stroking his cock, long sensuous, anticipatory strokes. Katherine moaned softly as Anna's attention became more intrusive. Her fingers parted the cleft, disclosing a pink anal aperture. Anna's tongue tip made contact. Katherine's sigh didn't sound like disapproval. Anna looked to me and raised her eyebrows. Realising where this was leading, I went to the bedside table drawer for a tube of gel. Removing the cap, I passed it to her. I looked at Petruccio who nodded. He said to Katherine, "Are you all right?"
"Yes," she said. "I'm fine. It's good so far." Everyone knew what could happen next.
Anna - wise Anna - slipped a hand underneath Katherine's body. I guessed she would be carefully testing the other woman's cunt for wetness, probably seeking to give a reassuring rub to the clitoris, continuing the arousal and distracting attention from the crucial next step. "Now then," Anna murmured. "There won't be a problem." She squeezed gel on to her fingers and on to the area around the aperture she had moistened with her tongue. She placed a finger tip against the opening, pressed but didn't attempt to penetrate. We'd been led to believe that Katherine and Petruccio had tried this themselves but now it was woman-to-woman and the sexual chemistry was entirely different. This was the moment when Katherine could say stop.
In fact, she reached behind her, gasped Anna's wrist and applied pressure. Unwilling to put it into words, she was giving the signal to go ahead. After a few cautious experiments, Anna's heavily lubricated finger slid past the sphincter with ease, paused in place, withdrew and re-entered. When there was no protest from Katherine, it was plain that the first big crisis had been surmounted. Anna gradually increased the speed of her fingering, added a second finger, then a third. The room was silent. I realised I was holding my breath.
At last, Anna broke the tension. "Katherine," she said, withdrawing completely, "tell me honestly, that didn't hurt, did it?"
Katherine turned and sat up. "No. It didn't hurt. You were very careful."
"Did you like it?"
A long pause. "I think I did, yes."
Anna leaned forward, kissed Katherine's breasts, slipped a hand momentarily between the woman's legs. "So shall we go on?"
Another long pause. At last: "Yes."
It took a little organising but Anna knew what she wanted and, having been in charge virtually throughout, I was content to play a supporting role and do as I was told. Once the condoms were in place, I lay on my back and Katherine, facing me, mounted my rigid cock. At first, Anna and Petruccio stood side by side behind Katherine. With one hand, Anna was handling Petruccio, with the other she was manipulating Katherine's arsehole. Katherine, supporting herself with her hands on my shoulders, rode effortlessly on my cock, absorbing the size without difficulty. I would have liked to nibble on the dark nipples that descended close to my mouth but never quite managed it. The squishing sound as she rose and fell was evidence of how effective the preliminaries - the spanking, the fingering, general atmosphere of unrestrained sex - how effective they had been in bringing on her lubrication.
Highly stimulated though I was, I felt able to maintain an almost trancelike state, relishing the warm embrace of this forty-three-year-old woman's cunt, close to the edge but never in danger of going over. For me, it could have gone on indefinitely. Anna, however, hadn't lost sight of our true purpose. She put her hands under Katherine's armpits and lifted her slowly off my still rampant cock. Then she urged the woman to bend forward and take me into her mouth. This had the effect of raising her arse. While Katherine sucked, Anna retreated and resumed her earlier activity, massaging Petruccio, fingering his wife.
I divided my attention between observing my cock disappearing between Katherine's lips and watching Anna's judgement of when to take the final step. At last, she nodded to Petruccio. Removing her fingers from the now open orifice, she applied more gel and then guided him in. Momentarily, Katherine tensed with my stalk halfway into her throat. Then she closed her eyes, relaxed and began to concentrate on her first authentic arse fuck.
To his credit, Petruccio was brilliant. Long though he may have anticipated this experience, he reined in the desire he must have felt, fucking the tight opening with loving sensitivity, gently exploring the depth to which she could take him without pain or anxiety. When, finally, he was fully buried, he paused and looked gratefully to Anna.
"It's all right," she told him quietly. "Fuck. When you're ready, come." Satisfied that he was building up a steady but not aggressive tempo, Anna slid her hand once more under the other woman's body. I knew she would be seeking the clit to ensure that Katherine reached her own fulfilment. It would be important for her to recall the orgasm when they looked back and considered the success or otherwise of the occasion.
Anna's ability to bring everything to the boil was evident from the way Katherine gradually seemed to lose interest in sucking me. My contribution was over. Other parts of her body were sending messages of exquisite excitement. She need to savour them to the full. I understood and took my cock from her mouth so that her mind could be solely concerned with the spasms that were about to engulf her cunt and her arse. There was no mistaking the climax when it arrived. Katherine threw back her head, her mouth wide, gulping for air, making unformed sounds of ecstasy. Petruccio responded by pumping uncontrollably inside her until he, too, crossed the line. For my part, I threw off my condom and, with a single stroke, ejaculated on to Katherine's tits. It was a while before anyone moved. Then, I was astonished to see, Katherine murmured something into Anna's ear before spreading my wife's legs. The final orgasm was achieved with great affection.
**********************************
Before they departed, Katherine and Petruccio were effusive in their thanks, convinced they would want to continue the experience in the privacy of their own bedroom. How successful they were, I have no idea. Of course, we never saw them again. It's impossible to say how much the success of that session was due to the fact that it was, in essence, a foursome with all the added stimulus inherent in our presence, two virtual strangers. I have to say we recall it as one of our most enjoyable diagnoses. Though even I still find it hard to believe the fee Anna suggested nor the apparent satisfaction with which Petruccio paid it. No doubt the Charity was as pleased as we were.