(No one's done anything on this chain for years so I thought I might have a go!)
You don't want to risk getting any of it on your hands so you grab the waistband of your pants and pull them down to your ankles as quickly as possible. You sit down on the forest floor to untie your shoes as Jean shifts uncomfortably, black cock bobbing. You suddenly feel embarrassed. Despite the horrific and unusual consequences, the overt sexual nature of the situation has left you with quite the boner, which will be painfully obvious to your companion the moment you pull your pants off.
You try to lighten the mood as you pull your shoes off. "Well if someone had said to me this morning I'd be stripping in the woods with a woman I'd never met before, I don't think I would have imagined it happening quite like this!".
Jean laughed despite herself and blushed bright red. You finish taking your shoes off and pull your pants over your ankles, carefully rolling them up so the latex isn't exposed. Hopefully you'll be able to get it off later. "It's a good thing it's a warm night." Jean said quietly.
"Definitely." You look down at your blue boxers, cursing as you notice a dark spot. You must have got some mud on you when you sat down. You go to brush it off when you feel it squelch under your fingers. You recoil your hand. That's not mud. Almost as if the latex sensed your presence, you suddenly feel a cold sensation on the shaft of your cock.
"Jean? It's soaked through. I'm gonna have to take my boxers off too. Just thought I'd better warn you." You feel the cold sensation start to spread slowly.
"I'm so sorry! I had no idea! Do you think it'll do anything?"
"I don't know. I'm gonna try and wipe it off my crotch with a clean bit of the boxers." You whip your boxers off and quickly go to scrub at your penis, careful not to touch the latex semen that is already on them. There is a small patch of black right in the middle of your shaft. You scrub hard for a few seconds and then take a look at the boxers. They're covered in latex semen. "I think it's working!"
Jean didn't reply. She merely looked in horror at your crotch.
"What's wrong?" You look down and realise to your horror that you were simply spreading the latex up and down your hard shaft. You drop the boxers and simply stare. "Oh my god, what is happening?"
Free from the sensation of scrubbing, you can once again feel the cold latex climbing up and down your cock. It almost feels pleasurable as it climbs over the lip of your foreskin and reaches the head of your penis. Simultaneously, it wraps around your shaft and starts to cover your balls with the same cold, tingly sensation. You can't help but shudder and let out a small grunt as the latex enters the tiny slit at the tip of your penis and penetrates deep inside your shaft. Immediately, you feel an orgasm hit you, stronger than any you've had before. Ropes of white semen come spraying out of your cock and onto your legs and the forest floor. Jean yelps and leaps back. Your vision blurs as more cum than you have ever seen comes shooting out of you, almost like your balls are being completely emptied to leave room for something else...
As suddenly as it started, it stops. Panting, you look down at your crotch to see globs of semen all over you. And there standing proud in the centre is your cock, completely covered in black latex, inside and out. If you didn't know any better you'd say it looked like you were wearing a strap-on.
"Are you ok?" Jean asked tentatively.
"Yeah, I think. That was intense. But I think it's over. Just let me catch my breath."
"This is the strangest night of my life." You look over at her. She looks flustered - understandably. Her face is flushed and her hands keep twitching around the hem of her t-shirt, almost as if there was something she wanted to grab onto. Was she turned on?
"Same here! We should probably try and move on. I think I can see streetlights through the trees over there." You go to grab your pants to wipe yourself off with, when suddenly you feel the sensation begin to build in your crotch again.
"What's wrong?"
"I can feel it starting again! I think it's changing!"