This is an odd one. I can't remember exactly how it started. There was a girl at a club I used to go to who was about 22 or 23. I was about 28 at the time.
We just seemed to click and I often went round to her place for a chat and a drink in the evenings. There was no sign that anything would go any further than just being mates. We'd chat about anything and just had a good laugh.
One evening we were chatting, and I honestly can't remember how the subject came up, but she said that she often had a wank in the car if she was stuck in traffic or bored on a long drive. I just blurted out that I'd love to be in the car next to her and watch. To cut a long story short she said that this would be no good as I wouldn't be able to see anything interesting - only her face. I told her that this could be even more sexy and she said "Come on then, let's try it".
The only condition was that we both had to do it. Her idea was that we would take two chairs and sit opposite each other, naked from the waste down. We then had to look directly into each other's eyes and masturbate. The rule was that we weren't allowed to look down to see what the other one was doing.
It was quite difficult at first. One, not looking down, and two, just masturbating in front of someone who was a comparative stranger.
After a few minutes it started to get incredibly intense. We were sat so that our knees were touching and our faces were no more than a couple of feet apart. We were both just staring into each other's eyes and I could feel the rhythm of her playing with herself through our legs touching.