I did have a similar experience where I wanted it to happen. Again, a long time ago. I and my GF were working at a football game or somewhere where everyone had blankets over their laps. Well she didn't unzip my pants but we were both stroking eachother outside our pants and a shot cum all over my pants and had to pull my shirt out so it covered my cum soaked pants. She also was so wet that it stained her red stretch pants and she had to do the same.
Hard just thinking about it.

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CK

"Women, you can't live with them ... pass the beer nuts." - Norm Peterson (George Wednt) on Cheers

"Sometimes you just have to say, what the fuck." - Tom Cruise in Risky Business

"It tastes so good. Once it hits your lips." - Frank the Tank in Old School