I wrote this as a note back to another person's blog, but after finishing it, I thought it was good enough to post on my own... 

My girlfriend at the time and I went to see the Jerry Garcia Band in concert in a sold-out 3000 seat concert hall...we got in early and actually got seats at a table on the main floor, right against the back wall and side wall along the steps leading down from the next level up...We were sitting on bar stools with a pretty good space between the back support and the seat, and as more and more people jammed in (and we had a couple of drinks and smoked a couple of bombers), she put her head down to rest for a few minutes...but by that time, she'd been pushed so far back into the corner that her ass ended up ramming into my crotch, and at first she just teased me a little bit with some lap dance style grinding,.

As the band started playing it's first song, and my dick was getting pretty hard in my jeans, she sat straight up, pulling her granny skirt into place, then leaned back and whispered in my ear "If you want to fuck my ass, this is your chance"...

Now, I'd always wanted her ass, but she wouldn't give it up-I'd fucked her plenty, and we'd done about everytthing else, but she always said either "No" to butt sex or would pull out her 9 inch dildo and say "Only if I get to do you, too" and I wasn't willing...so she scooted back down on the stool, pushing her ass back into my crotch-but she'd pulled enough of the skirt up that I was able to get under it, unzip my pants and pull my dick out, and after fingering her wet pussy a little, I pulled her thong panties to the side and slowly slid my cock up her tight ass...she settled back onto it, the started rocking back and forth with the music-we went at it like that for 6 or 7 minutes before I couldn't hold it anymore and shot a giant load of cum into her butt.

As I slowly and carefully pulled out of her (didn't want to scratch anything with the zipper on my pants, she smiled, and a couple of seconds later, sat up again and whispered to me "That was much better than I thought it would be...and I love the feel of your sperm running down my ass crack right now."

After the show, riding home in the back seat of our friend's car, she had me finger fuck her for almost the entire 90 minute drive.

Her pussy was just sopping wet by the time they dropped us off at our apartment...while no one said anything at the time, my friend told me later that his wife told him afterwards that the smell of her pussy got her extra horny, and he got a good fucking when they got home, as did I.