Jan and I had some problems with our plumbing and a mate and neighbor Derek said if I bought the new parts he could do it on Saturday morning. I grabbed the parts in my lunch break on Friday and left them in the bathroom ready for Derek in the morning. I phoned Derek and told him that I would be out all morning but Jan was there and the parts were in the bathroom ready for him. He had worked on my plumbing before so he already knew where all the stop taps were. He said he would be around at ten saying it would give Jan enough time for her beauty sleep not that she needed it. I was at work at 08:00 to find that the job had been cancelled. To make it worthy my while I decided to stay on anyway and prep Mondays jobs. I was finished by 09:30 and took the scenic drive home. Derek's car was on the drive so I guessed that he was still working on the plumbing. When I got in Jan was just making some tea and I went upstairs to see how he was getting on. I walked straight into the bathroom to find Derek with a pair of Jan's soiled panties from the laundry basket held to his nose. His face went as red as a beetroot and he started stammering apologies. I actually found it quite funny watching him scampering to put them back in the laundry basket. Having free and easy access to Jan's pussy, I had never thought of sniffing her panties or any other women's panties, although I can understand why some men do and enjoy it. To try to get over the embarrassment, I asked how the plumbing was going. Derek said it was completed and showed me it working. He had just finished the demonstration when Jan entered the bathroom with cups of tea. Derek and I took our cups and Jan picked up the laundry basket to take it to the utility room. The lid promptly fell off and of course Jan's panties were right on the top. The look on her face said it all. She knew someone had been handling her used panties. I could see Derek beginning to go red again as Jan left with the bin. He again mouthed sorry and then he was packing all his tools away. We stood talking as we drank out tea and when we had finished Derek said he needed to go and he would see me later. We had arranged to meet Derek and his wife for drinks at the pub at seven p.m. later that evening and I had told Derek the drinks were on me for doing my repair. After Derek had gone home, Jan mentioned the laundry basket and I told her that I had caught Derek sniffing her panties. Jan pulled a face and I joked that if I was married to Mavis I'd be sniffing her (Jan's) panties. I got a slap for my frankness. Later in the pub Jan and Mavis did the women's thing and went off to the ladies room together. Derek again apologized and pleaded for me not to tell Mavis. I assured him that I had no interest in telling Mavis and that I knew that Jan wouldn't either. Later that night in bed, Jan again raised the issue of Derek sniffing her panties and I joke that it's because he hasn't got the real thing like I have. Then I was under the covers and sniffed then licked Jan's pussy. That triggered a very energetic sex session with Jan taking the lead. I thought that if sniffing Jan's panties triggers that response from Jan then I will have to give Derek pairs regularly. As we lay afterwards Jan wanted to know if I thought that Derek fancied her. I told her that he'd need to be blind not to want to get in her panties, let alone sniff them. I could see that Jan was mulling my answer over and liking the answer. The following day Jan handed me a pair of her used panties in an air seal bag and told me to give them to Derek. When I handed them to Derek he went a little red, but I could see that he was also excited as he had the beginnings of a lump in the front of his trousers. He quickly stuffed them in his pocket and thanked me. I thought no more about it. Then about two weeks later he handed them back to me saying they had now lost the smell of Jan's pussy. That night I swapped them for the pair that Jan had been wearing when she threw them in the laundry basket. Jan saw me doing the swap and asked was I sniffing her panties now. I explained that Derek had returned her pair as they had lost all smell of her pussy and I was swapping them for another of her used pairs. She couldn't wait to get me into bed and rode me right there on the bathroom floor. Afterwards I joked that with a reaction like that Derek can have a full wardrobe if he liked. That triggered round two. Derek was grateful for the latest used pair of panties and I asked did he want any other clothed from Jan, wondering if he actually tried wearing them, or was it just an obsession for sniffing. Derek assured me that he just wanted them to sniff and he's not some kind of pervert. I laughed and told him if someone that sniffs women's panties isn't a pervert what are they. He still denied being a pervert saying that he is a connoisseur of fine panties. Regardless of what he is or not Derek was grateful for the loan of Jan's panties. He did say that the only thing better than sniffing them would be taking them off for himself. As if I was about to let that happen. This exchange of panties had been going on for over seven months when we had a small party at our house with about thirty people attending. It was for Jan's fortieth birthday. Of course Derek and his wife attended. We had a barbecue in the garden and drinks on the patio. Jan sat on our swing seat opening her presents. She looked absolutely ravishing. Then I noticed that Derek was sat on the floor and from where he was sat probably had a good view of Jan's panties. I made mental note to make sure that he got Jan's pair after tonight. Later in the evening Derek's wife said she had a headache and Tom one of the singles at the party said he would walk her home, allowing Derek to remain. Tom said he had to go anyway as he had an early morning start for work. Derek gave his wife a kiss and the Tom escorted her away. I had this quick thought of Tom servicing Derek's wife then dismissed it as ridiculous. The party went on quite late and Derek was helping Sue and Lorna to clear up and I was tending the barbecue damping it down for the night, and then the remaining few people let. That just left Jan, Derek and myself. Jan was pretty tipsy and was now sprawled across that swing seat in a less than ladylike position and Derek had taken to the floor again to get and even better view of Jan's panties. I was in the throws of pouring the three of us some brandies when Jan realized why Derek was sat on the floor and as I handed the brandies around Jan blurted out that Derek was a naughty boy staring at a ladies skirt at her panties. Derek went red at Jan's comments. I laughed and added that he probably wanted to see where his next pair were coming from. Besides being red I could see the look of yearning on Derek's face. By this time I had slumped back into one of the more plush garden seats. There was a little more banter about Derek looking at Jan's panties and then out of the blue Jan said, "Well if he wants this pair so much he had better come and get them." Before I could open my mouth Derek was across there and working on getting them down. I couldn't believe that my wife had suggested that and even more so that she was lifting her arse so Derek could ease them down her legs. Jan moved a bit more towards the sitting position which meant that Derek was now immediately in front of Jan's pussy and Jan pulled her legs almost together and up and over Derek's head as he pulled them off her arse and down past her knees. The Jan moved one leg at a time to remove them down over her feet and off. Then her legs dropped back to the floor either side of Derek just as he put the panties to his nose. He now not only had a my wife's panties, but also the perfect view of my wife's pussy just about a foot in front of his face. I couldn't see exactly what was happening as Derek was in the way of me having a view of my wife's pussy. I heard Jan go, "Ooooh." and wondered if Derek had touched my wife's pussy. I later learnt the he had rubbed the panties in my wife's glistening pussy to soak up all her juices. As neither Jan nor I stopped him he replaced the panties with a fingers and Jan emitted an even louder, "Aaaah." I still couldn't see and as he still hadn't been stopped Derek slipped not one but two fingers deep in Jan's pussy. An even louder, "Aaaah." I guessed that Jan would stop him when he had gone as far as she was prepared for him to go. I watched as Derek took the fingers from Jan's pussy and held them to his nose for a long deep sniff before sticking them in his mouth for a taste. I expected that Jan would now stop Derek, but it didn't happen and his fingers were soon back inside Jan's pussy and she she was groaning as he thrust them in and out a few times before repeating the sniff and lick routine that he did quite a few more times after that one. Watching this I found that I had obtained an erection and was gently rubbing my cock through my shorts. Then as Derek was again sniffing and licking Jan moved and was now kneeling on the seat with her arse thrust in our direction. Being that little bit higher I could now see Jan's pussy and it was splayed wide open. After the lick cycle Derek again thrust two fingers into my wife's pussy only now I had a clear view of them churning my wife's pussy. The force that Derek put into it had the swing seat rocking and she was moving back and forth on his fingers aided by the swinging motion. My thoughts ran wild imagining that it would be a nice position to fuck in, making use of the swinging action. While this ran through my mind I didn't see Derek stand up or that he taken his cock out. The next thing that I remember was that Jan let out a loud groan. Derek my best mate had just penetrated my wife's pussy and he was now plowing in and out. Jan had that glazed look on her face, the one she gets when she is enjoying a good shagging, and Derek was definitely giving her that. He was swinging her gently forward and thrusting hard as she rocked back causing his cock to plunge deeply and purposefully in Jan's pussy. I found myself stroking my cock, now free of my shorts, watching my wife getting a serious shagging from my best mate. He in turn had a cheesy grin on his face as he banged away at Jan's pussy. We were now way beyond the knicker sniffing fetish and Derek knew it and was making the best of it while it lasted and it lasted a long while. Jan had come twice and there seemed no end to Derek's pounding of my wife. I was close to coming and decided that I didn't want to waste it and struggled from my chair and across to my wife and offered my cock to her mouth. Jan has always been a good cock sucker and tonight was no exception and she sucked it into her mouth with an enthusiasm that I had not seen in her before. I came in seconds filling Jan's mouth with my sticky cum and Jan greedily swallowed it without a moments hesitation. I staggered back to my chair and slumped into it and watched Derek still going at full speed. The first I knew that he was there was when he groaned and pulled Jan deep onto his cock and held her there as he pumped his cum into my wife's pussy. I was a little miffed as he hadn't any idea whether Jan was protected or not and hadn't asked before dumping his load in my wife. I know she was safe, but he had no idea and could have spoilt a relationship by impregnating my wife. As Derek withdrew and staggered away to sit on another chair, cum trickled from Jan's pussy and dropped onto the patio slabs making quite a wet patch. Jan rolled onto her side sprawled on the swing seat. As soon as Derek had recovered enough I suggested that it was time he went home. With the biggest grin on his face he agreed and I closed and locked the gate behind him as he left with Jan's used panties. As I returned to Jan she had again moved into the doggy position that Derek had fucked her in and was holding her pussy wide open. I could feel the swelling returning to my cock and soon had my shorts down again and I started the swing seat gently swinging again and stood behind her. The first swing my cock missed and went between her legs and rubbed along her crack. The second swing I moved slightly and I penetrated Jan right up to my balls. Jan squealed at the sudden intrusion in her pussy. I knew she liked it as she switched her arse from side to side as the swing moved away. I held her by her arse and when my cock was far enough out pulled her back onto my cock. Jan was still twitching her arse as my cock plunged all the way back in. We were soon in a good pattern of pulling and pushing and Jan was synchronizing the switching of her arse to compliment the swinging action. I can honestly say that it was the best fuck of my life. Between the swinging and fucking actions and the memory of Derek doing this, just a short while back, had my cum boiling. I thought that I could fuck her all night long but soon the feelings were welling up and fortunately for me and Jan, she came first followed shortly by my own come. As soon as we had recovered I helped Jan indoors and up to bed where I fucked her again before falling asleep. Next morning it hit Jan that she had let Derek fuck her and she felt quite guilt ridden apologizing to me many times. I kept telling her that it was more than ok and that I had seen a side of her that I had not seen before and I liked it. In fact liked it a lot. Eventually we sat and talked about what had happened and what we did or didn't like. I discovered that I enjoyed watching. Jan enjoyed teasing as she had with Derek, flashing her panties. She had known for some time that he was looking at her panties and she enjoyed showing herself off and more importantly she loved getting fucked by Derek. We agreed that we should do it again. A few days later when I met up with Derek he was rather sheepish in case I was angry or upset. When he see that far from it, and that I had enjoyed the show and getting sloppy seconds, his attitude changed and he even asked if there was a chance of a rematch. I told him that when he needed Jan's panties changed he had better come and get them himself. That gave him a big broad smile. It was just two weeks when Derek found a reason for coming round without his missus. As soon as he saw Jan he took out her used panties and told her that he had come for some fresher more fragrant used ones. Jan said, "Help yourself." Derek was on the floor in seconds looking up Jan's skirt and stroking her pussy through the flimsy material. Very quickly Jan was groaning from Derek's fingers teasing her pussy. Then he was sliding her panties down and as she stepped out of them. He quickly sniffed them and then put them in an airtight sealed bag and put them in his pocket. My cock was already rock hard imagining what was coming. I didn't have to wait too long before Derek bent Jan over the arm of the sofa and got up behind her and continued his teasing of her pussy with his fingers. Jan was now moaning her head off and every few minutes Derek would hold his fingers up to his nose and sniff them and then lick them before repeating the cycle. Like before I didn't see him do it, but Derek had his cock out and instead of replacing his fingers the next time he sniffed them, he slipped his hard cock into Jan's pussy. I heard Jan squeal with delight and then as Derek started to thrust at Jan's pussy she was thrusting back and groaning. They were soon self consumed as they pounded into each other. Jan came first and froze as she went through her orgasm. Derek quickly followed her with his own orgasm and pumped his cum into my wife's pussy. Still hadn't asked about protection. As Derek moved away I quickly replaced him and took my sloppy seconds, fucking Jan with the same ferocity that Derek had plowed her with. Jan came a second time and as she revived I continued to slam into her. Derek had revived and was now offering Jan his sticky limp cock. Jan sucked the whole thing into her mouth and was playing with it with her tongue as she sucked it. I could hear Derek's heavy breathing, but was more interested with my own as I went head first into a fantastic orgasm. Derek was quick to replace me when I moved away and was pounding Jan for a second time. I sat watching as Derek slammed away at Jan's well used pussy for about twenty minutes. It was pretty ordinary as he just pounded away until at Jan's pussy until he came again, still in her. After recovering we all sat and had a few beer before Derek kissed Jan on her lips. I wasn't expecting that and got just a little jealous, but the kiss was quickly over and he thanked Jan for her panties and was then on his way home. Jan and I fucked another two times before we made it to bed and sleep that night. For the last sixteen years now, Derek has come round for fresh used panties every two to three weeks, and almost every time used Jan's pussy for his own pleasure, and I used Jan immediately afterwards often multiple times. To this day Derek's wife has no idea of Derek's panty fetish or that he uses Jan's pussy. For those of you about to say why don't we have a foursome, I have never fancied Derek's wife and have no inclination to have sex with her or any other women for that matter. I have offered Jan the chance to try other men, but she says that she could never cheat on us. The three of us are happy as we are.