A fantasy of mine is to sneak off for a piss in the bushes down the park and a female member of the public comes and joins me. Now don't get following people into the bushes, but if your boyfriend/girlfriend needs to go, you could join them. If they're not already into pissplay, seeing you pissing in front of them might plant the seed? Before you know it you'll be going into the bushes to get bent over and pissed inside of!
Obviously pissing in public is frowned upon, but if you had some kind of high ground or distance between people and yourself, you could squat down in the open. You wou