This story features wife sharing/cuckoldry/slut wife so please don't read it if that bothers you.
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After they've been married a few years many couples get into a routine as far as sex goes. One view would be that they fall into a rut, but in the case of Kim and I it was just a comfortable routine that suited us both reasonably well.
We tended to have sex once a week and it was usually on a Saturday night. Sure there'd been lots of exceptions, but we'd been married for fourteen years and a pattern was pretty well established.
In truth I would have liked to do it more often and incorporate more variety into our lovemaking, but Kim wasn't really up for that and we were happy in other ways so I could live with a minor case of sexual frustration. I had a pretty good idea that I wasn't the only husband who felt like that.
I had cautiously raised the possibility of swapping with another couple, but Kim had said no. Still my initial worry that she would be deeply offended had been groundless. She'd certainly been surprised, but to my relief it hadn't actually upset her.
I had pointed out that I was the only man she had ever slept with and she might want to broaden her experience - "life isn't a dress rehearsal, sometimes you have to take a risk and give things a try" was how I'd attempted to persuade her. Kim had said she wasn't curious about what it would feel like to have another prick inside her; as far as she was concerned they probably all felt very similar.
There had been a chink of light for me when she did concede that perhaps one day if everything fell neatly into place she would consider it, but, seeing my eyes light up, she had warned me that was pretty unlikely.
That conversation had taken place three years ago and nothing had changed in the meantime. I was now just ten days short of my fortieth birthday and Kim is six years younger. It's possible that nothing would ever have happened if it hadn't been for Kim's weakness - a liking for fashionable shoes.
She came back from a Saturday afternoon shopping flushed and excited. Dropping her bags on the kitchen table she had to show me the shoes she'd bought.
"Look at the colour, feel the quality of the leather and the workmanship," she enthused.
"Look at the price!" I exclaimed. "Two hundred and fifty pounds - we can't afford that."
"That's just it - I got them in the sale for fifty pounds."
"That's a good price," I conceded, suitably mollified.
Later that night we were making love in the dark. I was moving above her, thrusting in and out and wondering how it was that I never became bored with the silken feel of her lush pussy.
"Can I tell you one thing about those shoes," said Kim.
"What?" I said, slightly puzzled. Shoes aren't exactly my idea of pillow talk.
"I did get them in the sale, but the sale price was one hundred pounds. Promise you won't get angry."
"Then why tell me fifty pounds?"
"I did pay fifty pounds, but this is it, don't get angry, I had to flirt with the assistant to get that price."
That made me pause because if there's one thing Kim isn't it's a flirt. She's just the opposite, rather reserved, and I've often wished she would lighten up a bit. My heart started beating faster and my cock stiffened further. I guessed, or rather hoped, that there was a story to this.
"Go on," I said. "Tell me more."
"Well I've been in that shop several times. It's a bit expensive, but it is the nicest one. The assistants know I'm not a big spender, but they're always helpful and don't mind me trying different pairs on."
Kim paused, her mouth seemed dry, as though she was nervous.
"Go on," I said.
"I've chatted to one of them more than the other and he served me today. He brought these shoes out, I told him they were too expensive, but he insisted I try them on. They're just beautiful and so stylish. He said they looked perfect and he would knock the price down to ninety pounds, just for me. That's when I started getting flirty with him. He's in his twenties, I'm in my thirties, so I can't imagine he really fancies me - it was just a bit of fun. I asked him to help me take them off and he did, but he took his time about it and touched my legs more than was necessary. So I asked him if he could do me a special price and he slipped them back on and kept on touching my legs. He was saying how beautiful they looked, but the way he was looking I think he meant my legs. He said he'd do seventy pounds. I parted my legs a little and asked him what was the very best price he could do. He looked hard at me and that's when I did it."
"Did what?" I asked gently.
"I parted my legs and raised one knee so that he could see my knickers," Kim said quietly. "He gasped and said fifty pounds, then I couldn't help it, I blushed and became all embarrassed, and he did the same. Then he boxed the shoes and I paid and left as quickly as I could."
What Kim couldn't hide and I couldn't miss was the unmistakeable message her body was sending me - her love juices were in full flow. I'd slowed to a few gentle thrusts so I could concentrate on what Kim was saying, but even so her slick wetness was oozing out and soaking my balls in a way that I hadn't felt for years. I already knew the answer to the next question, but I wanted to get it right out in the open.
"Did it turn you on, flashing at him?"
"Yes," she said simply.
"Did you get wet?"
"Yes, very. When I was walking away from the shop I felt very uncomfortable because my knickers were wet and the air felt so cold."
I had to smile at that, but I returned to the questions.
"Did you want him to touch you?"
"No, no," said Kim. "It was just that...well it did give me a thrill."
"In what way?"
"I don't know. I'm not a tease really; it was just the thought that he was looking at me, lusting after me. He's a good looking young man and I'm in my thirties, but I could tell I excited him."
"How do you know?" I asked with a smile.
"The look on his face, the bulge in his trousers."
"He had a hard-on did he?"
"Yes," said Kim, warming at the memory. "And I was tempted to touch it, to reach out and feel how hard it was. He's young, I bet he was like a iron bar."
"Will you go back?"
"Not for a long time. I couldn't look him in the eye, I'd be too embarrassed."
"No, what I mean is I want you to go back, and more specifically I want you to go back on the 17th."
"The 17th...but that's your birthday!"
"I know. Your fortieth birthday present to me is to go back to that shop and flash at that assistant again."
"I can't do that, letting him see my knickers again. No. I can't do it."
I thrust hard into her, pinning her down on the bed with a desire and urgency that penetrated her core.
"He won't see your knickers because I want you to take them off beforehand. I want you to flash your pussy at him."
Kim's head jerked back.
"Paul, no."
In reply I thrust again and again, driving into her with a lust that sparked a reaction.
"Do it. You've done it once. Go back, but this time show him your pussy, give him something to get really hard about. Will you do it?" I kept pounding into her and felt the shuddering waves of an orgasm sweeping through her.
"I...I don't know. Oh God. Fuck. Oh fuck. Yes, yes I'll do it."
"What will you do?"
"I'll show him my pussy."
I gave an almighty groan and my prick pulsed, firing burst after burst of cum into her. We gripped each other fiercely as the sensations slowly subsided.
I felt my prick shrinking. I wanted to seal the agreement and make Kim realise that this wasn't some wild fantasy that had been played out and would now be discarded.
"What will you do on the 17th?"
"What do you want me to do?"
"I want you to go back to that shop with no knickers on, make sure you're served by the same assistant and flash your pussy at him."