I really enjoy reading about people's experiences on this site I thought it was time that I shared some of my own. This happened quite a few years ago now but was the first of a number of subsequent experiences. I have changed names but this is completely true. In my mid-twenties I was going out with a girl called Kay. A tall, busty blonde who was a real head-turner. We met at University and were together for 4 years. We started off as really good freinds and then had a full on relationship - where the sex was always great. Although Kay started off less experienced than me, she always relished new experiences and was always prepared to be quite adventurous. She loved dressing up (she had long stunning legs that looked amazing in stockings and suspenders) and would often let me fuck her in places where we might "get caught". She wanked me off in a packed cinema once! Well it was only a matter of time before we started pushing the boundries of our lust - especially as I had started to reccommend certain books to her that involved quite open descriptions of sexual experimentation (threesomes, bi-awakenings etc) and when I asked her how she found them the response was always positive. This led to some lurid bedroom fantasies about "other people" being with us and I was determined to find a way to make the fantasy a reality as I was sure Kay would be up for it. Looking back, I am not sure why I didn't just ask her but I suppose some excitement lay in the fact that if it did happen it would be something that I would ochestrate for her. There was a tradition amongst a group of freinds of mine to meet between Christmas and New Year at one of our freind's houses, Mike, for a bit of a piss up. It always ended up messey and in years gone by I had often woken up on his living room floor in a right state. This particular year I decided to take Kay with me and planned to stay over Mike's house with her. We took sleeping bags and loads of booze. That year it turned into quite a big house party but we managed to bag the living room for ourselves and at the end of the night drifted off into boozy sleep in our sleeping bag. I woke the next morning feeling quite groggy and with Kay tugging at my cock in the sleeping bag. She was nestled into my neck and breathing heavily whispering that she wanted it inside her. I started to finger her pussy and things started to move along nicely when suddenly the living room door opens and in walks Mike. Of course he couldn't see anything that was going on under the covers but I felt my cock really stiffen as he started chatting as I had two fingers up my girl's sopping hole and she was still squeezing my hard on. While Kay chatted to Mike I continued to finger fuck her and I was really getting off on how surreal it all was. Kay was really wet and I was trying to see if Mike had any idea of what I was doing. If he did he was hiding it well. He offered to make the teas and walked out the room. Kay almost exploded and started rubbing her clit as I fucked her with my hand and snogged her deeply. I whispered "If Mike knew what we were doing he would have got a raging hard on". Kay only said "mmmm" in response. "Do you think he's got a nice cock?" I whispered (all the time playing with her) "Would you like to see it ? All big and hard?" I said. "MMMM" Kay said and she was now writhing on my fingers and began to cum. After cumming Kay settled down with a big grin on her face and then made a move to the bathroom. Fuck me those teas were taking ages ! When Mike did eventually return he was none the wiser. I sat on the sofa in the sleeping bag while Mike pottered around. We were the only two that had stayed over he said and was promising to make us some breakfast. Kay walked back into the living room. She was fully dressed ! I was gutted and convinced "the moment" had passed and started putting my own clothes on. Kay sat quite close to me on the sofa and as soon as Mike walked out of the room, started to squeeze my bulge in my jeans. "You look pissed off" she said. "I am. I'm horny as hell and looks like I'm going to stay like that for a while". "Poor you", she said, "let me help you". With that she started to rub my hardness through my jeans. I started to rub her large tits through her top and then reached up under it and released one from her bra cup and took her hard nipple into my mouth. I was tounging and sucking it when Mike walked back into the room. I looked up with my girlfriend's tit in my mouth and saw my mate standing there with his mouth agape. Everything suddenly "froze". Kay made no effort to move me and had a firm grip on my cock in my jeans. After what felt an age Mike spun on his heels and went upstairs - not saying a word! I carried on sucking and then pulled Kay's top off and removed her bra. She was now topless and I was feasting on one her tits. "Call him" I said between mouthfulls. To my surprise she did. "Mike, can come here a minute please." A few moments later Mike comes running down the stairs and bursts into the living room but this time only wearing his boxers ! You can imagine my relief at this sight! "Can you give us a hand" Kay said and lifted her right breast and erect nipple towards him. Mike literally lept to the sofa and began to suck and slurp at her nipple whilst I was doing the same to the other one. I have to say my cock was now bursting through my jeans and I unzipped myself and Kay fumbled one hand to it. I could see she was looking to grab Mike's as well and I was quite shocked when she pulled out a monster cock from his shorts. At least 9" - it was thick and uncircumcised. I would call myself average sized but quite thick (and circumcised). Kay started pumping at our cocks but I could tell she was in awe of Mike's hard-on. The atmosphere was electric and I had never felt so turned on before. I could tell Kay was really enjoying the feeling of two hard glistening cocks in her hand. How I did not cum I dont know! Mike suddenly said "Can I lick your pussy". I almost burst out laughing, it was said so politely and in such earnest. Kay looked at me and giglled and began to wriggle out of her jeans. I positioned myself so that she could suck me whist Mike got to work on her pussy. Mike started to get into it and was really lapping her pussy and working to her gutteral instructions. She was really pulling on my cock and sucking me hard and I was fighting every urge to cum in her mouth. At one point she stopped sucking and with my cock-head on her tounge she just looked up at me and smiled and then mouthed the words "thank you". Mike made her cum and then stood up. His cock was huge and Kay lifted herself onto all fours. Mike moved in behind her and started to rub his cock along her crack. He looked at me in the eye and I nodded and he moved forward pushing his purple head into her sopping hole. Kay made a deep groaning noise as he squeezed slowly into her. I moved round so that I was underneath her and had a good view of Mike's cock sliding in and out of her. Kay started to gobble on my cock. We were effectively 69'ing with Kay on top and with me started to lap at her clit as Mike's cock slipped in and out of pussy hole in steady firm strokes. I was completely immersed in the moment and started to lap at her pussy and the underside of Mike's cock as it was pumping my girlfriend's hole. They both verbally responded to this and Mike's strokes grew more urgent. A couple of times his cock fell out of her pussy and landed on my mouth. It was salty tasting and harder then I expected but instead of being repullsed I was turned on by the feeling of a cock on my lips and tounge. I abandoned myself in the taste and texture of pussy and cock in my mouth and felt that I was about to cum. At that moment Kay started to let fly with her groans which were turning into a frenzied cries and Mike's pumping stopped and his cock began to spasm as it pumped cum up Kay's pussy. i of course completely exploded into Kay's mouth at this point and felt her dribbling the bucket full of cum I had just delivered into her mouth. We were completely exhausted and piled into a heap on the sofa. It was a life altering moment and I knew that Kay and I had eneterd another dimension in our sexual relationship. It was the first of several sessions with Mike (and subsequent sessions that Mike and I had with his girlfreind). When we back at home in bed, I told Kay about how I felt about inadvertantly having Mike's cock in mouth. Kay nuzzled up to my ear and cupping my balls, gently squeezed them and whispered, "I would love to see you sucking him off." That is, however, another story for another time.