My wife has always amazed me with the way she can flex her vaginal muscles.

The first time I had my cock in there, the way she squeezed it felt like she had her thumb and index finger wrapped tight around it, sliding up and down it. I loved the feeling.

When I asked Amanda how she learned to do that, she said in college she took a belly-dancing class and the instructor taught all the women how to contract their vaginal muscles rhythmically, saying this would help keep their stomachs flat. It’s sure worked for her!

We love games, and have recently started playing one that we’ve dubbed the “cock game.” A couple of months ago, after a night of drinking and dancing, we stopped at a porn shop planning to pick up a couple of new sex toys. It was almost midnight, and the seven or eight men who were browsing immediately turned to stare at Amanda, whose voluptuous five-foot-eight body was decked out in a short skirt and a scoop-necked silver metallic blouse that showed a major portion of the tops of her breasts.

We browsed for several minutes. My tipsy wife kept picking up dildos and vibrators and commenting about how each would feel inside her, loudly enough that her comments were overheard by the other customers. She finally settled on a 20-inch two-headed latex dildo and a latex dildo nine inches long and two inches wide, which is a little thinner than my cock.

Slurring slightly, she said she bet she could keep the nine-inch dildo inside her all night. I laughed and said in her condition she couldn’t stand up for 20 minutes with it in her pussy. She replied, “I’ll take that bet,” and asked what she’d win if she won. I said, “Whatever you want for tonight.”“Okay,” she said defiantly, and went to the counter to pay for the toys.

The young cashier had obviously overheard our conversation, and when Amanda asked to use the bathroom, he grinned and showed her where it was. She handed me the two-headed dildo, then went in the bathroom. A couple of minutes later she came out with her black lace panties in her hand. She came up to me, placed the panties in my hand and said confidently, “Start the clock, baby, and watch me win this bet!”

My watch has a stopwatch function, so I started it and Amanda moved around the store looking at more toys as well as some sexy clothing. A number of times she picked up an item and said, “I can have anything if I win, right?” Each time I nodded and she said, “I’ll want this when I win.” I was confident she wouldn’t be able to keep the dildo inside her because it had felt pretty heavy and I figured gravity would work against even her powerful vaginal muscles.

For the first ten minutes Amanda walked all around the store. Several times she even squatted with her legs somewhat apart to examine an item on the bottom shelf, and still the dildo stayed inside her! I noticed several of the customers watching her with keen interest. It was obvious that they were fully aware of our bet.

At the 15-minute mark, Amanda’s face was starting to turn pink — I guessed due to her straining to keep the dildo from falling out. I figured it was only a matter of seconds before it fell to the floor. But I was wrong! She kept it inside her and even did a couple more squats without it falling out.

Finally my watch beeped signaling that time was up. Amanda, face flushed, said loudly, “I’ve won, honey!” A few seconds later the wet dildo plopped on the floor at her feet. She reminded me again that the bet was for whatever she wanted that night, and I nodded. She told me to pick up her dildo, then buy the sexy clothing items she’d picked out earlier, while she went to claim the rest of her prize.

She walked up to the young cashier and asked if any of his video booths had glory holes, and he told her with a smile that the fourth booth on the left had one in each wall and the fourth on the right had one. With the smug look of a champion, she obtained several tokens for the video machine and announced that she’d take the one on the left.

As she walked past me, she said rather loudly, “I’m so fucking horny, baby, I could fuck an army. After you pay for those things, you can come back and watch me collect the rest of my winnings.” With that, she sauntered seductively to the video booth area in back and entered “her” booth.

Now Amanda and I have swapped partners on a couple of occasions while playing strip poker with friends, so this wasn’t a marriage-breaker situation. While I was collecting the items she had pointed out earlier, I saw several men stampeding toward the back. As I paid for everything, the kid at the counter grinned and said, “Your wife’s something, mister.” I nodded.

I walked back to the back and found a couple of guys standing outside Amanda’s booth and the booths on either side of it. I heard the muffled sound of her moaning, and of two men groaning. One said her pussy felt unbelievably good. Seconds later she let out a shriek as she came, and seconds later she was joined by a man grunting, “Oh fuck, baby, I’m coming!”

A couple of the guys who were standing waiting their turn smiled nervously, until I smiled and said, “Hey, a bet’s a bet!” That put them at ease while they waited.

A minute later a guy came out of the booth to the left of Amanda’s and the next guy in line pushed his way past him into the booth, like it was a bathroom and he had to pee really bad. The guy exiting the booth said, “Man, your wife’s really something. Thanks!” Then he walked to the front of the store.

A couple of minutes later Amanda opened her door and I saw that she was hunched over in the tight space blowing the guy who just entered the one booth and she had her ass tight against the wall behind her. She took her mouth off the cock she was sucking and said, “Honey, the guy behind me fucking my pussy has a huge dick. When he comes out, please tell him I want him again later.” Then she resumed blowing the guy in front of her.

For the next hour I stood watching my wife switch from one wall to the other, sucking and fucking every cock that came through those holes. She took care of a couple of guys who I knew weren’t in the store at the time of the bet, but had obviously been told about it! Several guys, including the guy she wanted again, came back for seconds. At one point when there was a lull in the store, the clerk joined in! And all that time I watched, hearing the guys fucking her complimenting her on what great pussy muscles she had.

Finally Amanda had had enough. She asked for the dildo and her panties, and she reinserted the dildo in her pussy, then donned her panties and said, “When we get home, I’ll collect the rest of my winnings by having you eat me out.”

I drove as fast as I could without getting busted for speeding! As soon as we were in bed she straddled my face. I removed the dildo and lapped at the fluids leaking out of her pussy.

Since then we’ve kept going back to the porn store, and each time I have had Amanda walk around looking at sex toys with the dildo inside her for a longer time. First the bet was 40 minutes; two weeks ago it was a full hour! Both times I lost, and each time she repeated her performance in the video booth, and then we went home and I ate her out and fucked her. The last time, the clerk said the sexy clothing she’d picked out was a gift as thanks for the uptick in their business.

I did finally win a bet! A week ago we went dancing with Terry and Jim, the couple we occasionally swap with. Since Amanda had the dildo in her purse, I bet her she couldn’t dance for 20 minutes without having it fall on the floor. As she told Jim and Terry about our adventures with the dildo, they sat there looking awe-struck.

Once again Amanda took my bet, and lasted almost 15 minutes before the dildo fell on the dance floor. When it did, she let out a loud “Oh shit!” that was heard over the music by numerous people. The bet was that she had to bend down and pick the dildo up and carry it in her hand in front of the whole nightclub to the ladies’ room to wash it off. A lot of people stared at her carrying her toy to the rest room.

When the four of us got to our house, I told Amanda the rest of the bet was that she had to just sit there with her pussy on fire watching Jim and me fuck Terry over and over, and then she’d have to lick our loads out of Terry’s pussy. Both women balked at first, but I reminded Amanda that a bet is a bet, and Terry agreed to do it if Amanda taught her how to do her technique of flexing her vaginal muscles.

Once Amanda got started on Terry, she had two intense orgasms. I figured it was only fair that she had to do what I had to do when I lost. After that, I told Amanda she had to give both of us a blowjob, which she did eagerly. Then I let Jim have a turn at her pussy while I took Terry in the guest bedroom for some more fun.

That was one wild night! And in the morning Terry surprised us by asking when we wanted to repeat the bet. We’re on for next weekend! Terry suggested we go to the porn store. I bet that’ll be a blast.