I was living with my girlfriend, I was about 40 and she was a few years younger. We were doing some computer work for a friends business and he used to call round to see how things were going, sometime we'd have a few drink and a bit of a laugh before he went home. Anyway, after several visits the sexual tension was very evident. A few months earlier I'd been trying to persuede her to swing, and one night after she'd had several drinks she shyly asked me if I'd like to watch someone else ... touching ... her and I replied Yes ! But was forgotten about as the opportunity had not arisen - unlike my cock :-) On this particular visit Mac's visit was on a weekend evening, her kids used to stay in her Mothers most weekends, very convenient, and we started to have a few drinks and a laugh. She'd already had a couple of large ones (drinks) before he arrived so soon her inhibitions drifted away and her skirt was riding as she moved, revealing her stocking tops which she didn't try to hide. The two of them were looking at some paperwork on the dining room table and I was on the floor watch the telly, I could see them both under the table touching each others legs, but nothing too sexual yet. The paperwork had spread too much for the table so they got down on the floor and spread it out, I sat up on a dining room chair and continued to watch the telly, and their antics at the same time. The earlier, and present drinks must have been catching up on her as the flesh above her stockings and her knicker were quite visable to us two (getting randier) blokes. The paperwork was soon forgotten as, for some reason, the tickling started again, I even saw him cop a feel of her braless tits (with no complaint from her) under her top. As a sign of my approval I joined them on the floor, tickled her a little as well and put my hand up her skirt and rubbed her (wet by now) knickers. After a while I was back on one of the dining room chairs, she came and sat next to me and said in a shy but sexy way "can I make love to Mac". My heart was pounding, I had been waiting for this for a long time, my first threesome, my firsrt sight of her getting fucked by someone else, I settled my thoughts and replied "as long as I'm not left out" - we smiled at each other and all three of us went through to the lounge, put a naughty video on and sat down on the four seater leather couch, with her in the middle of course. It wasn't long before our hands were groping her, I could hear his fingers making slurping noises in her soggy fanny while I felt her tit's and teased her nipples. Her clothes were soon removed leaving her sitting there in just stockings and suspenders, we both stripped off and I went down between her legs licking the juice from her drooling fanny, I glanced up and saw for the first time another cock entering her mouth - she sucked greedily as I licked greedily. I got up off my knees and stood in front of her, her legs parted even more as I lowered myself, sliding my engorged cock deep into her, I thrust in and out slowley at first but my strokes became more urgent and faster as the enormity of the occasion got the better of me very quickly and I came inside her in a wild frenzy of groans and spasms. We quickly changed positions and I lay on the couch with her sucking my cock as he knealt behind her and started to fuck her dripping cunt with me watching, my face only being inches away from the action. We all ended up in a sweaty heap with a bit more playing about. We had several more time with him in different parts of the house. The afore mentioned dining room table was one of the venues, but that's another story - phew !