Offline/Let the girls go to bed
You acquiesce and stand up. If she's not into it you don't want to force it. Besides, there's still plenty camping left so she might come around yet.
Asha adjusts her nightie and Emma practically shoves her friend into her sleeping bag. Emma quickly crawls in beside her, laying on her side so they can face each other. It's tight and their faces are inches apart but they don't seem to mind, not that there are many other options when you're forced to share one sleepsack. When you tuck yourself into your own sleeping bag they immediately start whispering, giggling, gossiping about who knows what. With such a small cabin in the middle of the forest you should be able to hear every detail of even the faintest whisper they share, but the pitter patter of rain on the roof is plenty loud enough to drown out the hushed gossipy girls.
You turn off the flashlight and settle in, but the longer you listen to them the more you swear there's not just gossip going on here. Despite their desire to go to bed, the girls keep bursting out in short bouts of laughter followed by utter silence or a flurry of activity. They shift around regularly, changing positions and even crawling over each other. At one point Asha strips off the t-shirt you loaned to her and tosses it aside. Maybe she just doesn't like it, or maybe she's hot, but it's a little suspicious that she is suddenly deciding to sleep naked with her friend in a cramped sleeping bag, especially after asking for that nightie.
Annoyance and envy mounting, you shine your light at the girls causing them to freeze. You do this more than once, asking what they're up to, and each time they give dismissive one word answers like "nothing," or "sleeping." The girls giggling and rustling around while naked seems far from innocent, but if they really just wanted to have fun without you that's fine. Disappointing... but fine.
They stay up very late, smitten with whatever wicked activity they're sharing. Every time you're certain they must have dozed off they prove you wrong with abrupt movements or soft chuckles. You sporadically stroke yourself, frustrated but turned on by the frisky girls 'sleeping' beside you. Even long after all signs of activity cease from their side of the cabin, you lay awake picturing them masturbating together, or practicing kissing, or perhaps more, with well ingrained images of pussies and asses flooding your mind. Still holding your cock, you eventually fall asleep, but only once the rain finally stops.
- - -
You're positive that you're going to drown in the downpour, your mouth agape as droplets pelt your tongue. A violent tidal wave crashes into you. Then another. You cough and sputter. The clouds laugh before you curiously realize that this is all just a dream. But not all of it...
Opening your eyes you shake your head to and fro as a warm liquid cascades past your senses. Asha is crouched over you. Both of the girls are laughing as your naked cousin, in a deep squat, continues to pee straight down onto your face.
The moment you realize what's happening you fling your body forward in order to sit up, but end up headbutting Asha squarely in her pussy. She squawks, stumbles, and falls back onto her butt on the bottom half of your bag. Thankfully she also stops peeing. Now rubbing your wet forehead, you sit up proper and spit the taste of girl urine off your tongue.
"...the fuck are you doing?" You squint, blinking away sunlight and pee.
"That's for getting us all wet last night!" Asha explains. The phrasing catches you off guard, unsure if she might be alluding to something other than the rain, but you're too upset to mull that over. The girls giggle some more until they recognize how serious you're taking this, then they glance at each other with uncertainty.
"Fucking what?!"
"Well, I mean... you said there's no rules... right?"
"No rules?!" you parrot back, wiping at small puddles soaking into your sleeping bag.
"I dunno. Y'know... I- I mean... i-it was Em's idea."
"What! No it wasn't! You wanted to do it!"
"But you said it would be funny!"
The girls start bickering while you still have a hard time taking in the situation. This really just happened. It isn't a dream. "What the fuck?!" you repeat, incredulous. "You seriously just peed on my face?"
Silence follows, the two girls sharing a long look... right before they both burst into laughter. They think this is hilarious. You're not laughing. Although you can sort of appreciate the twisted weirdness of it, you never wanted to be on the receiving end of a golden shower. Even if explaining how a girl peed on you once might make for a crazy drunk story at a party one day, that doesn't make this okay.
When you don't join in with the cackling girls, they restrain their amusement and go back to looking shameful. It's pretty clear that they aren't exactly choked up about it though. With how mad you are you really want to put them in their place. They need to be punished.