I do a lot of hiking on remote and semi-remote trails.  Sometimes, when I feel particularly horny and daring, I strip to only my hiking boots and hike naked.  I love to hike this way and play with my cock until it is hard and dripping precum.  

One fantasy I have is to be hiking and stroking and come up on another guy doing the same or just alone and jacking his cock.  While he is stroking, I continue to stroke and walk up and start a coversation.  This is how I would like it to play out:

"Hey, nice cock!"  I stare at his erect cock, still stroking mine.  

"Thanks!  Yours is nice too."  He says, noticeably nervous.

I smile, remove my pack and move closer.  "Nothing better than stroking it outdoors.  It feels so good and free."

"Yeah, I know."  I notice him checking my cock out.  "Are you hiking alone, too?"

"Yeah, I am."  I move right next to him and openly admire his cock.  "I was wondering,"  I start out, "would you be interested in having a little help?"  He didn't back away; a good sign.

"Well,"  he hesitated, "It depends on what you mean."

"I've been wondering what it would be like to jack another guy.  That's all I mean.  I would just like to give you a hand."  I laugh nervously and he agrees.  After a couple minutes, we are sitting next to each other and jacking each other.  It feels so good!  After a shorter than usual time, we both cum and just sit naked and talk.  We both really loved it and decide to make it a habit.