One summer our parents decided to take the family on an "off the grid" vacation. No TV. No internet. No portable consoles.

No phones!

"You guys never spend any quality time together these days," they told my sister and me. "And when you do see each other all you seem to do is fight. This vacation is a chance for the two of you to reconnect, start over and forge a new relationship."

So off we all went to a cabin in the middle of nowhere, where there was nothing to do but stare at trees and count down the days, hours, minutes, and seconds until we could get back home to civilization. Oh, and there were only two bedrooms, so Cadie and I had to share a bed like we were kids!! Oh yeah, we both gave them hell for that!

As you might expect, the first couple of days and nights were an absolute disaster. Cadie and I fought more than ever, and I think our parents were seriously considering just giving in and taking us all back home. But then, on the third night, when the olds had gone off in search of a bar and some quiet, Cadie suddenly turned to me...

"Hey," she said, grinning mischievously. "You wanna play Truth or Dare?"

My first instinct was to roll my eyes and tell her to act her age. Cadie was younger than me by two years, but we were both technically adults, and games like Truth or Dare were for kids. And besides, Cadie had always been a total bitch to me, stealing my clothes, getting me in trouble for stunts she'd pulled, spreading rumours about me all over town... stuff like that. So I couldn't see why she would want to play nice all of a sudden.

"C'mon," she insisted. "They've already got us sharing a bed, and it's not like we've got anything better to do. Besides, it might even be fun. So...?"

"Yeah, okay," I agreed, a little hesitantly. My natural inclination to distrust my sister flashed hot in my mind, but she was right: it wasn't as if we had anything else to do, and maybe sharing a laugh together was exactly what we both needed to get over our long-running hostilities.

"But on one condition," I warned her. "What happens in the game stays in the game - our secret forever. Swear it," I told her.

"I swear," Cadie replied, with her hand pressed to her heart. "It'll be our secret."

We quickly set up a table of "dare" forfeits. In truth there wasn't a whole heap to choose from in the cupboards of our little cabin but when I returned to the bedroom after raiding the kitchen, I found Cadie had produced a nearly-full bottle of vodka from some hidden personal stash.

"Okay, so it's a drinking game," I thought. "Probably should’ve expected as much from Cadie the wild child."

But I didn't say anything. I knew it would only result in my being called a wimp or a square, and it did seem more fitting somehow than the meagre assortment of condiments and bowl of ice-cubes I'd managed to forage.

And... yeah. I guess the next part should’ve been obvious. By the third round, the ice-cubes had melted, and the whole "eat a spoonful of mustard" just didn't have the giggle-factor it had possessed when we were so much younger. So the game quickly degenerated into "truth or drink", with Cadie opting to drink casually between her obligatory shots.

I, on the other hand, had no such tolerance for hard liquor, and my head was starting to spin. But it was nice, y'know, playing and laughing together like when we'd been much younger.

"Your turn," I told Cadie. "Truth or dare?"

"What's the question?" she asked, giggling and letting her head flop to one side drunkenly.

I shrugged. "Just tell me something true, I guess. Something I don't already know."

"Okay," Cadie snorted. She looked thoughtful for a few moments, and then an evil gleam came into her eyes. "I bet you don't know this," she said, her voice suddenly flat and serious. Then she hit me with it... her Truth: "I've always wanted to pee in your mouth."

"Wait... What?!" I couldn't believe my ears. "You want to... to pee in my mouth?"

"Sure," Cadie shrugged. "Whenever we argue, which is basically all the time (right?), I get like a flash of you down on your knees, and I make your mouth my personal toilet. Honestly, it's been that way for as long as I can remember."

I let out a strangled laugh. Maybe it's because I was drunk, or the fact that this mad bombshell revelation came under the disarming umbrella of the game, or maybe it was Cadie's complete nonchalance about it, but somehow I wasn't totally horrified, the way I rationally knew I ought to be. More than anything I felt... sort of curious actually. I wanted to know more about these "flashes" Cadie was apparently having. I mean, they were about me, after all. 

"So what," I asked. "I just... let you do it?"

"Every time," Cadie snorted, winked, and downed another shot. "I mean," she rasped over the alcohol burn, "it's my fantasy, right? So yeah, you're very compliant. I fill your mouth up with my pee, and you swallow it down. Simple."

"Wait!" I cried. "I swallow your pee? Ew!"

"You don't think it's 'ew!' the way I picture it," she chuckled. "In my fantasy you can't get enough of it. You're a very thirsty girl."

The way Cadie was looking at me started to make me feel decidedly uncomfortable. "Okay," I said, screwing up my face and raising a hand. "Okay stop. That's enough!"

"All right," Cadie said, still looking at me with a strange sort of intensity. "I reckon that's my turn done then. So... truth or dare?"

I hadn't quite recovered from the shock of Cadie's strange confession, and shook my head to dislodge the stubborn mental images.

"Hey, hurry up," Cadie whined playfully. "I gotta go pee."

Perhaps it was a coincidence, or maybe she'd timed it deliberately. Either way, on the back of her confession, those last words lodged in the air between us in a way that was impossible to ignore.

"I've always wanted to pee in your mouth," she'd said. Now she needed to pee, and it was just the two of us together in the cabin. Drunk. Alone. Had it been just a statement, or a veiled suggestion? The truth is, I really couldn't tell. 

I became suddenly aware of my heart racing in my ribcage, and (to my horror and surprise) my nipples hardening beneath the light fabric of my expensive nightclothes. Whether Cadie had meant to ask it or not, the unspoken question might as well have been written in great big flashing neon letters: CAN I PEE IN YOUR MOUTH?

The awkward, pregnant silence that followed was a hundred miles wide and weighed ten-thousand tons. And with every second that passed I found myself asking: "Why haven't I just told her 'No way!' already?" But for some reason I couldn't seem to make myself say those two simple words, until eventually it fell to Cadie to break the stalemate.

"Choose dare," she said quietly, but with a weight that somehow managed to imply everything we were both deliberately not saying. "Choose dare."

A voice inside my head was screaming at me to quit playing this stupid game, to be outraged, to get up and storm off, to go anywhere that Cadie wasn't, and to sober up.

“Why are you still here?” it cried out, full of astonishment and fury. “If you don't leave right now, you know what that looks like, don’t you? It looks like you're thinking about doing it - which can't be true, because it's perverted and disgusting and totally degrading! It's her freakin' pee for chrissakes! And, did you forget? This is Cadie! Cadie!! Not only is she your sister, but she's the nastiest, most spiteful little bitch you've ever met, remember? She's made your life a living hell for years, and if you do this you won't ever be able to take it back. She'll always have this over you. And... And... And..."

"Okay..." I whispered hoarsely. I felt suddenly cold in spite of the warmth of the room. "Dare. I choose dare."

From that moment on, everything felt as if it was happening in a crazy dream. I'd made up my mind… sort of. I was going to play the game. Why? I told myself it was because I wanted to know whether Cadie was bluffing or not. Sure, I'd play along until she backed down, exposing her lie for what it was. And if she didn't back down? Then I'd know she had been telling the truth about what she wanted to do to me. I'd know that she really was a twisted pervert, and at that point I'd pull the plug and end the game myself.

Yep. That's what I told myself. But the truth was that Cadie's confession had pricked something within me; and a great, primal hunger I'd never known before had lifted its head and opened an eye. "Let's see where this leads," it seemed to say, its deep voice rumbling up from my hips and vibrating all through my body. So when Cadie (half smirking, half frowning in her attempt to gauge the authenticity of my compliance) told me to get down on the floor, I did as she said without so much as a murmur of defiance.

"Good," she said, her eyes shining with a feverish excitement as I sat down on the bare wooden floorboards in front of her.

Standing over me then, Cadie thumbed the waistband of her nightshorts hesitantly, a shadow of uncertainty passing over her face, just for an instant. Then it was gone, and she slipped the shorts down over her hips and let them fall.

I gasped, and let out an incredulous, tipsy laugh. I mean, it was the first time I'd seen Cadie's vagina since the our mother used to bathe us together as kids. Somewhere along the line she'd blossomed into a disgustingly attractive young woman without me noticing.

"You're serious, aren't you?" I asked in an awed half-whisper, suddenly feeling very, very sober. "If I stay here now, you'll..."

"I told you," Cadie cut in. "I've wanted this for longer than I can remember."

"Holy fuck," I thought. "This is really happening! My bratty little sister is getting ready to relieve herself into my mouth for real, and... and I'm not doing anything to stop her!"

"That's fine," the primal hunger growled in a voice like a lion's purr. "Don't stop her yet. This is just getting interesting."

"Hold still," Cadie said, moving forward to position herself over me, so that her pussy hung only a few inches above my lips; so close that I could smell her body's most intimate odors. Then she knit her brows and her face became a portrait of intense concentration.

I waited (waited!), looking up at Cadie, trying to read in her features some sign of when her stream was about to begin and wondering why I still hadn't brought an end to this charade. It was only really then that I realized with a queer sort of a electric thrill: "I'm not going to pull the plug. I'm not going to stop Cadie. In fact, yes, I want this just as much as she does. I want to know what her urine tastes like, and I want to know how it feels to be used as her toilet."

"Okay, open your mouth," Cadie said. "Quickly! It's coming."

I leaned my head back and opened my mouth wide, ready.

It started with just one drop.

Someone had set the world to run in slow motion, and I watched as this one single golden droplet formed on Cadie's glistening pussy lips. It hung there for what seemed an eternity before detaching itself to fall, quivering and shimmering through the air. Okay, I know how this sounds, but it was really kind of... well, beautiful in its own way. Sort of perfect. Then it was inside my mouth. I felt it impact on my tongue, and tasted a sudden rush of an obscure, intoxicating sourness. I remember thinking, "Oh, so this is what pee tastes like," with a curious detachment, and then, without meaning to, I let out a happy, perverted little groan, which in turn became a laugh of utter disbelief.

This was actually happening! I was really doing it! I was letting Cadie pee in my mouth!! Then Cadie started up for real, and a sputtering stream of warm, golden urine erupted from her urethra. The first of it sprayed over my chin, running down my neck and into my cleavage. Cadie corrected quickly. With an adjustment of her fingers she pulled the stream upward and directed it into my mouth.

"Oh... Oh fuck!" she gasped breathlessly, her pale blue eyes wide and bright with a cruel euphoria as she gawped down at me. "Oh my god. Oh my fucking god."

I couldn't believe it either, but somehow she'd done it: gotten me there, nestled between her parted thighs with her warm, sour urine steadily filling up my mouth. After a few seconds, Cadie stifled her flow. She stood looking down at me, my mouth open and filled to the brim with her pee.

I had no doubt what was coming next. I knew what my sister wanted from me. Even so I waited for her to ask for it. To command it.

"Swallow it," she said flatly, looking me square in the eye. "I want you to swallow it."

By now my heart was pounding like a jackhammer in my chest. "If I do that..." I thought, "If I take her urine into my body, I'll never be able to take it back. I'll have let Cadie make me her toilet for real."

The thought provoked a fresh surge of that deep, primal hunger, and a wave of perverted arousal washed over me. I didn't know why, but (my god!) my body was positively thrumming with desire to be completely degraded by Cadie... not in spite of who she was, her cruelty, her pettiness, her endless contempt for me, but in some sense precisely because of it.

And there was, I knew, only one way I could satisfy that desire.

Not looking away for an instant, I closed my lips around the golden puddle that my sister had poured into me, waste waters expelled from inside her own body...

And swallowed.

Cadie gasped gleefully, and her eyes shone with a fierce, triumphant light.

She'd done it. She'd got her fantasy wish.

"Good girl," Cadie crowed, mockingly, her features arranging themselves into a mocking sneer. We both knew the meaning of what had just happened between us. How could we not? I had submitted to her. Not just in that one perverted act, the climax of a stupid and petty game, but in some much more profound sense.

It's hard to explain, but in some way the authority that was naturally mine as the elder sister had gone. I felt it go. I had surrendered that position of sisterly primacy to Cadie in the act of swallowing her urine.
"Well?" she demanded. "Open up."

I obeyed without hesitation and let Cadie fill me up a second time, and a third. Each time she stifled her flow when my mouth began to fill, allowing me time to swallow.

All trace of my sister's former uncertainty and disbelief had vanished. The burning elation remained in her eyes, but tempered now by a cool, contemptuous self-assurance.

"Yes! Take it, you fucking bitch," she crowed as I swallowed her fourth load and came straight back up for more. "Drink all my fucking pee. Show me how badly you want it."

Cadie hadn't been lying when she'd said she needed to go, and she managed to fill my mouth several more times before her reserves finally ran dry. I won't deny that a part of me felt a pang of disappointment when they did.

Afterwards, I sat breathing heavily and letting the last lingering drops fall from Cadie's pussy onto my tongue. My mind was playing over the fact that I had a bellyful of Cadie's urine sloshing around inside my body, and was trying to work out how it should feel about this strange fact that had seemed beyond unthinkable only fifteen minutes before.

"You know what this means, don't you?" Cadie sneered down at me. But before she could deliver the punchline, the sound of the cabin's front door banging shut and voices in the next room cut her off dead.

Our parents were back.

We both froze like rabbits caught in the headlights of a fast-moving automobile. The dreamlike quality of the evening burst and reality reasserted itself with all the subtlety of a slap to the face. How much time had passed since we'd started playing our game? Evidently a lot.

Mom's voice drifted to us through the wall from the next room: "Well the light's still on. I'll just go check in."

The sound of footsteps fast approaching the lock-less bedroom door, drew a panicked squeak from Cadie. Quickly, she grabbed up her shorts before diving onto the bed and pulling the covers up to hide her naked lower half.

As for me, I threw myself into one of the chairs beside the fire, hoping the pee-damped patches on my nightshirt wouldn't be too obvious from the doorway. Then, as the door began to open, I grabbed a book up off the floor beside my chair and pretended to be reading it. It's exactly the sort of thing Mom would have expected me, the "good girl" elder daughter, to be doing. Not playing silly, alcohol-fueled games. And certainly not drinking her sister's urine.

"You girls okay?" Mom asked from the doorway, a tone of world-weary suspicion edging her voice. Then she added, probably without intending to: "No big fights, or anything?"

"No, Mom," Cadie replied with sickly sweetness from the bed. She'd always been able to turn on the innocent act at the drop of a hat. She stretched and yawned a little too theatrically, and...