The following week was pretty normal until Thursday when the girls went out for a girlie dinner. When Carol came home she told me we had to chat. She told me to go to put a towel on the bed she would be up in a second. When she came up she hung up her dress then grabbed something out of a drawer and went to the bathroom to remove her make up. She came to bed shortly after dressed in her sexiest short see through nightie, she stood at the bottom of the bed put her arms behind her head pulled her elbows back in an exagerated stretch, her large breasts thrusting up and lifting her nightie enough to show me her glistenig pussy. She told me to sit in middle of the bed and spread my legs. She climbed on to the bed and lay face down, her face right in front of my throbbinghard on, I could feel her breath on my helmet.

She ran her toungue over my helmet then said "can we have an honest chat", "of course" I said. "Do you remember when we were first married and you used to fantasise about you lending me out to dirty old men and having them make you watch while they did disgusting things with me" she asked, i said "yes but you always said all the fantasy's we've had over the years would be just that". She then said "what Helen is doing to Rob turns you on doesn't it", i said "it's absolutely blowing my mind". My cock throbbed as she licked the helmet again and i looked over her head down her back to see her gorgeous bare bottom wriggling as she tried to tub herself into the bed.

Helen told me tonight John had her accompany him to visit a client, she had no idea why as the whole meeting she was sat outside the office, all became clear when they left he took her for lunch in a country pub. Normal chat to start with then he wanted to know how Rob was reacting. She told him he was like a dog with two dicks always wanting to hump her leg. When she went on I was squirming in my seat, John want's to have a bet with Rob. "What sort of bet" I asked. she replied "he wants him to gamble his manhood", "how" "he will have 3 attempts to satisfy Helen (fuck an orgasm out of her) if he fails he will finish her with his tongue then after his first attempt he will be given 6 with a strap John has provided". "The second time 12 with the strap and third 18 with the strap and then he will have to phone John and ask him to come round and show him how to fuck his wife".

My cock and balls were throbbing waving about in front of her face, she just laughed and grazed the helmet with her tongue. " What would you do if you were faced with that bet Paul" she asked, my responce was to ejaculate all up my belly and chest. She moved foreward then licked it all up, she crawled up to kiss me, passing all my sperm back to me. I then asked her "who she would get to make the the bet with", "John he's arrogant enough and according to Helen he's got a voracious sexual appitite" she replied. I couldn't believe my lovely wife might be thinking of doing what i had always fantasised about, amazingly I was getting stiff again. Carol had inverted herself and was laying on her back her thighs over mine, I was now staring between her well spread thighs as she rubbed her clit. "I wonder what its like to have a big fat cock stretching my pussy" she said as she rubbed faster and faster, her hips were bucking up and down, I dove foreward forcing myself right up her, it was like riding a bucking bronco. I suggested she find out " accept the bet", she screamed out her orgasm as I shot up her.

It took ages to recover then Carol cuddled into me, embarassed telling me how disgusted she felt that she could humiliate me like that. I reassured her it was just a bit of fun and look how excited Helen looked when ever they meet to discuuss it. Half an hour later after lots of reassurance and finally reaching an agreement that carol would join Helen and accept the bet we fell into a deep sleep.

Friday was normal 8 o'clock found us out side John and Helens we left the girls and went to the pub, got a drink and sat in a quiet corner and discussed what was happening to us, we were like two naughty school boys. Rob then showed me a video on his phone, It was the one John had taken in the office. I was looking at my SIL naked humping John's hand, Rob told me he would send it to me so i could view it with sound because he'd turned it of because of where we were. I carried on watching as she frigged herself off then went to the office big red arse jiggling, lying back on the desk. I felt like i'd been punched in the stomach as i saw the cock that was forcing its way into her knowing soon my beautiful Carol would be sujected to the same fate. Listening to her grunt and squeal as he forced it in. Rob just smirked as I had to adjust myself, there was no way i could go to the bar after watching that so rob got last orders. As he returned our phones pinged we had a whatsapp from an unkown number. We opened them looking confused at each other we had a picture of our wives holding their summer dresses wide apart and naked underneath. Three things wrong I got Helen Rob got Carol, it was light in the pics but dark outside and where were they, not at our houses, looked like a pub beer garden. Ping! another one, we both had the same pic both our exposed wives next to each other holding a leather belt between them with a caption "bet accapted boys lmfao". We downed our drinks and ran home only to find them giggling fully dressed in the summer dresses the were wearing when we left and full underwear, the only give away was the leather strap on the coffee table.

Carol took me home and explained as we went to the pub her and Helen had stripped and put their dresses back on and gone in our car to another pub to meet John to agree the bet, he had insisted on seeing the prizes hence the pics. Very embarassing as people had noticed what was happening in the garden, they left swiftly but before they dropped John off he insisted Carol inspected her prize, she was made to handle him. Very red faced she told me she nearly came just holding it with her sister watching.

We all went out for Sunday lunch then came back to ours, grabbed a dink then sat in the lounge. The girls then said we had seen them nude so insisted it was now our turn, we stripped blushing as Carol collected our clothes and took them up stairs we were both mortified as we both were bone hard in front of our respective wives. They insisted we stand infront of each others wife. Helen then went on to explain the bet, every day next week we would try to prove our manhood. Monday Rob would make his first attempt at 7 pm we would meet in the pub at 9 each night, Tuesday would be mine then Rob again then me, but on Friday we would both make our last attempts together in the same room. Embarrassing as this was our wives were rolling about laughing as our cocks jerked and waved about in front of them, we just couldn't understand why we were so excited considering the embarassment we were suffering and what we were going to suffer during the week. They then decided as we needed to save our stamina if we need to get rid of our hard on's we could wank and passed us a tissue, we were made to face each other. I just couldn't get it to go down, nor could Rob so red faced in front of our wives we began tugging, obviously the embarrassment didn't last long as we both came in under a minute.