It started one hot sweaty night in a crowded 'Mansions' night club in Adelaide. My hot girlfriend(now wife of 20yrs) was dressed in a sexy short open backed custom made denim dress with no bra. The club was going off this night, sexy girls & guys everywhere enjoying load music, lotsa alcohol and each other. My girlfriend had to go loo so i grabbed a couple more drinks. When she returned she gave me a tongue sucking kiss, (i thought oh oh somethings going on ) she then sat, jumped rather seductively on my lap, wiggled a few times, leaned back, opened her handbag and said 'wat u see'. Dumb ol me took a good 30 seconds to click 'it was her silk G string - yes thats right NO PANTIES OR KNICKERS. With an obvious rock hard cock she proceeded to grind me into the ground (to the sound of Michael Jacksons - Beat It) and made me blow like a sperm whale. Funny thing was no body suspected a thing, not even our friends sitting with us or they are all just unlucky & stupid.. The only problem was i had cum stained pants and such a hard cock i had to site there and relax for 15 minutes before my knees stopped chattering and the blood went back to my brain. It was the first time I had sex in public and to this day I still cant believe my luck and the fact we had hot sex with over 100 people around the club.