At work one day my g/f called me to say she was in the area and was going to drop by, was the place busy (I ran a corporate gym), it wasn't. She shows up wearing a long coat, takes me into my office and takes it off to reveal a full lingerie set complete with stockings and garters, drops to her knees and starts blowing me with the door wide open. Took my load in her mouth, then bent over and started fingering herself. It was like a porno movie. I was stunned, but not stunned enough to not do her again after a couple of minutes recovery. It was probably the hottest thing anyone ever did for me.
Too bad she turned out to be a psycho.