My old workplace has this split site, one is in the town centre, and the other is in a country setting a few miles out. A minibus runs between the two sites ferrying staff to and from the town centre.
Now this minibus is perfect for going shopping in your lunch break, and most of us use it for this purpose.
There was this one time where I was on my way back to work to the country site from town on the minibus and I was the only one aboard (apart from the driver obviously). Part of the route passes through this lush parkland, which is very popular with office workers sitting out and having lunch/sunbathing. It was a hot day and there were many doing just this, including some lovely 20-something women. Whilst gazing out and enjoying the sight, I felt a familiar hardening in my pants, just for a moment I had a thought - but quickly dismissed it. Then I thought - well why not. I was sat at the back, the seats were high, and no one would see.
I unzipped my pants and eased out my now hard and throbbing cock. It felt so good to touch it whilst looking out at all these people, and what's more - in a seat where my work colleagues so often sit. Glancing around every so often, I wanked away, gazing out at the passers by as we drove past, soon I had to quickly reach in my pocket for a tissue and filled it with creamy cum.
By this time we had almost reached our other site, so I quickly wrapped the tissue around my now shrinking cock, and tucked it all away inside my pants.
I quickly made my way out of the minibus and inside to the toilets to clean up.
This isn't the most exciting wanking story I've ever experienced, if I can pluck up courage I'll post some more.