This all happened back in 1999 when we were both recently single,  me at 35 and Karen at 33, but its still quite fresh in my mind.  
Karen was someone we would talk to as a group of 2 friends when out on a Sunday night,  she wasn't a stunner, didn't have a great figure,  probably between a UK 14 and 16 but she had a fantastic pair of tits, the first thing you would notice really.  
As the weeks went by and we got to know each other better we would often have a private chat between the 2 of us and one night she just came out with “why not come back to mine for a shag". Tempting though the offer was at the time I was getting up at 5am for work so said I couldn't but I’d be up for it the next weekend when my weekend off included Mondays due to the shift pattern I worked.  
Come next Sunday the offer was still on the table so we made our excuses a little early from our respective groups and got a taxi back to her house,  as it happened she knew the female driver and straddled the transmission tunnel to lean through the seat to talk to her,  as she did this her skirt rode up showing her knickers and for the first time ever I found myself fingering someone in a taxi, after arriving back at hers we had sex several times,  I remember her sucking and swallowing, swallowing was a first for me.
We started seeing each other after this and I found she had a naughty side to her,  she asked quite early in the relationship would I like to fuck her arse,  I of course said yes and she made me promise to be gentle,  after about 3 strokes she was shouting at me to bang it in, she loved anal, I remember picking her up from work one night and she was taking her knickers off as I was reversing out of the car park as she was so horny and had been thinking about sex all day and we had to find somewhere to park up on the way back to her house.  
Nothing out of the ordinary happened for a few months,  just endless sex until one Saturday night myself and Steven were out for the night and struggling to get a taxi home, it got to about 1am and the queue was still massive and going down slowly when I suggested walking to Karen’s house and crashing as it was only about 20 minutes walk. I lived about 7 miles away and Steven a similar distance. On arrival though there was no answer at the door and it was in the days before we religiously carried our mobiles everywhere,  I suggested he kept trying while I went around the corner to the phone box to ring her house.  The phone answered quickly and it was Steven on the other end so obviously she'd woken up and let him in.  When I got in the house they were sitting opposite each othet Karen wearing her dressing gown,  Steven started laughing and said “she told me not to tell you but she came to the door naked with her big tits bouncing,  she’s got a nice pair mind" I had to agree and me being full of drink and her also as she’d been to a friends on Vodka I was asking her to show us her tits,  she wasn't playing at first but I started massaging them through her dressing gown and eventually they were free and in my hands. Without asking me and Steven had a tit each in our mouths and I could tell she was enjoying it by the noise coming from her,  I remember going for her pussy and realising I’d been beaten to it by Steven.   After I while Karen was on her back on the sofa with me fucking as Steven was feeding her his cock,  unfortunatly Steven didn't get hard enough to ask to swap places but got a good sucking while myself and Karen completed what we were doing and all ended up sharing her bed naked.  Next morning I woke and still feeling horny and slightly drunk went straight down on Karen,  I saw her starting to stroke Steven’s cock then the doorbell rang and it was her friend returning her kids she’d been watching overnight so end of play. Steven left soon after and me and Karen didn't discuss anything until that night in bed.  
She admitted it wasn't her first time strictly speaking as years earlier on a girls holiday the 3 girls met up with 3 men and went back to the hotel, they all had boyfriends at the time and one girl had decided not to have sex which left one lad left out, she said he started dicking about sticking his cock in her face as she was being fucked so she thought fuck it and started to suck the lads cock while being fucked being rewarded with cum into 2 holes.  
At one stage I started to show things down a little as I'd heard a whisper that she was seeing others on nights out when I was at work,  I sort of got confirmation of this one night when I arrived unannounced.  I was working late shift and decided to call around about 11.30pm, on ringing the doorbell I could hear running around upstairs then just as I was about to leave a flustered and drunk Karen answered the door wearing a bra and a towel wrapped around her bottom half and nothing else.  In the living room she was telling me that one of her friends had come back with a lad and they had fallen asleep upstairs,  I needed the toilet so made my way upstairs to see a naked man sitting on her bed and 2 people sleeping in the spare room so that was that, I didn't like being cheated on,  I left and finished the relationship but it didn't end there.  
Every now and again I would get a text from Karen asking me to go over with an excuse like the kids had lost all the channels on the VCR,  her washing machine door wouldn’t open being 2 of them from memory and once to ask advice as she was suspended from work for having sex while on a works trip with an overnight stay, it turns out one of the lad’s knowing her reputation has been rubbing her fanny with a big banana asking if she could take it and they ended up having sex as she was so horny from the rubbing, he had even managed to get her to take the banana before the sex started.  Anyway it was always an excuse to lure me in for a shag, sometimes telling me what she had been up to to turn me on or just playing with herself or me until I cracked.  
One of these times she was asking if I thought those pills that promise to grow your cock worked as she remembered being on a beach once on holiday and 2 lads apparently had massive bulges in their shorts and she had always fancied trying a big cock. This obsession with a big cock carried on and she would often mention in a text that she fancied trying a big cock so one day after lots of naughty texts I said if she really fancied it I would try to arrange it for that day while she was on the boil,  she seemed keen so straight away I looked for someone available that day and managed to find someone boasting 9 inches about 40 miles away who was willing to travel and a meeting was set up to meet on a service station just off the A1 that lunchtime.
When I went to pick up Karen I think she thought I was joking as I had done all the arranging from my house but she had worn stockings and a skirt as requested and got in the car and we drove to the meeting place and parked up,  the lad was already there and once we parked up he came to Karens side of the car and she opened the door to allow us to talk,  you could tell he was up for it as his hard on was clearly visible through his Jeans due to no underwear as we were to find out.  
As agreed he followed us to Karen’s House but once inside nerves got the better of her and she headed for the kitchen while I ushered him into the living room,  I went to the kitchen and Karen looked nervous and had poured a glass of vodka,  as she was drinking this I started playing with her tits which always got her going and managed to remove her knickers before we went to join our guest in the living room.  
After brief introductions I stood behind Karen playing with her tits and eventually easing them out,  our guest them started sucking on them so I moved my hands to her pussy at this point,  we ended up with Karen only in stockings on her back in the sofa with me licking her fanny while our guest got his cock out and fed it to her,  he hadn't been exaggerating about the size,  I moved up and started thrusting into her while she was sucking him then it was our guests turn,  he took her on the floor with her legs up over his shoulders,  I tried getting my cock into her mouth but there was no room due to his position so I contented myself by hand watching her taking a pounding,  after a while she asked me to lie on the floor so she could straddle me, as she was doing this she told me she was also having her arse fingered by him,  after a bit of this I shot my load and the lad lay down and she went to riding on him as she liked being on top,   as this was going on I coaxed myself hard again and tried getting my cock in either her arse or pussy at the same time but it wasn't possible as she was so full I was just being pushed out. He eventually cum up her and went to clean himself up as he had to travel home to pick the kids up,  myself and Karen then had another fuck both being horny still until it was time for her to pick up her kids.  
Shortly after this I had to cool things off totally as I was getting serious with a new partner, I ended up having to change my mobile as my new partner was wondering who was ringing all the time,  anyway it was all fun while it lasted.