Before I was married, I dated a gorgeous woman from the office. My best friend and I both had the hots for her, but for some reason I was the first one to ask her out. After a few months of dating the sex got better and better. Although she would literally do anything, she always liked a little light bondage and blindfolds. Most times I would blindfold her, tie her down in bed on her stomach, push a pillow under her hips, and have oral and fuck her from behind. Usually it was pretty wild. We both loved it: start with a little oral, she would get out-of-control loud, and I would always hammer her and explode all over her back.
One night (after much planning) I snuck my friend into my apartment, and he took my place. After a few glasses of wine I'm sure she had no idea what was going on. He gave her several oral orgasms and then fucked her like an animal for half an hour, it was amazing. Never had I been so enamored by the sight of another man's cock moving in and out of my girlfriend. Wow. She just lay there, enjoying everything, face in the pillow, moaning and yelping like usual. To this day she has no idea it was not me - and we've done it at least a dozen times since. We broke up months later, but it's hard to forget those times. 😎