It's late afternoon on a lovely summers day and instead of catching the bus home you decide to walk. Your route takes you alongside a large park which you choose to walk through rather than around and after a hectic day in the office, you enjoy the peace and tranquillity.
Although you have never used it, you are aware of the small toilet block near one of the entrances, hidden behind trees and other foliage. As you walk you become increasingly aware of the effect two cups of coffee and a glass of water are having so you head towards it.
As you enter the inside looks very gloomy after the bright sunlight and you step up to the stall, undo your zip, release your penis and wait for the relief to begin. It doesn't take long and once in full flow you look around. It is only then that you see at the far end of the row another man standing close in to the wall with only his upper body visible above the porcelain modesty screen.
You think nothing of this and given the great British reserve in these circumstances, you just look down and concentrate on not splashing your shoes.
Out of the corner of your eye, however, at the extreme edge of your peripheral vision you become aware of small, almost imperceptible, regular movement from the other man. A surreptitious glance towards his direction confirms the movement is coming from his upper arm and is obviously connected to an activity lower down. He is studiously looking at the wall above his head and does not return your look.
You realise he is masturbating albeit gently, and suddenly you are intrigued. Up to now you have never given much thought to other men doing what you do quite frequently in the privacy of your home, but there is something about the fact that somebody very close to you is doing it, and it excites you.
As your flow subsides you have to make a decision. Are you going to shake your penis, tuck it away, zip yourself up and walk out, or are you going to stay for a little while and see what happens? You shake the drips off anyway and realise as you do that it is now a little bit thicker and longer that it would normally be.
You shake it a few more times than is necessary then decide to do what he is doing and just remain still between the modesty wings. You can feel yourself getting harder and a glance towards him again shows the movements are more pronounced now. He can tell you are interested.
You look away again and are amazed that it is having such an effect on you. You would never have dreamt of deliberately going with another man but suddenly finding it like this -- suddenly you want to see what will happen.
You remain still for a little while until a loud sniff draws your eyes back to him and you see he has moved back a bit, not so that you can see his penis, but now quite clearly showing you his actions. He is masturbating openly and encouraging you to be his audience, and moves a bit further back so you get an unrestricted view of his erection and the movement he is applying to it. He looks quickly across at you to see if you are watching and when he sees you are he turns partially towards you. You can now see he has his balls out of his fly as well and his other hand moves down to cup and caress them.