I was at my girlfriend's birthday party when we were only 18 and the champagne and vodka had been free flowing for most of the afternoon. Many friends were meant to meet us out that night so had taken off to get changed and left only a few of her closest female friends left.

We were all in her bedroom and were about to get changed when my girlfriend suggested I leave as 'the girls want to get changed' but things took a turn as a couple of the girls said they didn't care if I watched. As my girlfriend changed one of her friends commented on how nice her breasts were looking and that she should get them out... she was too shy to do so and kept holding onto her bra as the girls grabbed at it, but I snuck up behind her and undid her bra. One of her friends (who I knew was bi-curious) started to fondle them and comment on them, whilst subtley running her fingers over her nipples.

This set things rolling and then the girls suggested I get changed with them too - by this point one of the other girls was topless and all were in their underwear - and they were telling my girlfriend to strip me. Off came the shirt, then the pants... she was on her knees as she had removed the pants and one of the girls said
'how hot would it be if she just went down on him in front of us all?'
at which point another replied 'oh, that would be nice - I'd be so horny I would just be sitting back here with my hand down my pants though'

After about 30 seconds of coaxing from the girls and nerves from us both, my gf had slipped my underwear down and took me in her mouth - right there in front of 3 of her friends. The laughter and giggliing in the room stopped instantly and one of the girls let out a little moan/sigh. It felt so good as she took my length into her warm, wet mouth - whilst her friends watched us both. I saw one of the girls start to play with herself from outside her panties, and the other was slowly rubbing her nipples... and straight away I became twice as hard... I could hear the masturbating girl moaning now and it was getting me close already.

I picked up my girlfriend and threw her onto the bed, removed her panties and started going down on her, she was moaning loudly and now the girls had moved from the edge of the room over to the bed. The bi-curious one had started playing with my girfriend, whilst one of the other girls was moaning louder and louder and she played with herself. After giving my girlfriend orgasm after orgasm the girls were more involved until there were hands everywhere and you couldn't tell what belonged to who... I built up to one final climax and blew my load right over my girlfriends stomach as she finished her final orgasm and two of her friends moved in to lick and suck my pulsing cock clean right in front of her.