For the first time in decades, light poured into the storeroom in the basement of the old research institute. The scientists who once worked there had finally blown themselves up – along with the rest of the east wing of the building – numerous years ago, but nobody dared set foot near the place out of fear for the structural integrity of the building, or the stories floating around about horrors unleashed in the accident.

But as time passed, the danger faded; now the whole place was overgrown, left to ruin by the owners of the land who couldn't sell it or find anyone to even demolish the place. So by the time Rhapsody and Melody got to it, very little was there to stop them from roaming around the place like they owned it. The most dangerous thing they'd run into so far was the barbed wire around the outer perimeter, but Rhapsody was talented at getting into places she wasn't supposed to be, and had easily found a spot where they could get in under the fence.

The older of the two siblings, Rhapsody was in front, entering the storeroom first, holding a camera to record everything of interest they saw. The six-foot tall rabbit was equipped very minimally for the trip, with a satchel on her back, a belt pouch of extra supplies, and nothing else. Her bare body was covered in fur, wine red on the back and tannish-pink on the front. Soft white fluff circled her neck and filled the space between her collar and her breasts, with a bob cut of vibrant blue hair on her head.

Melody followed close behind. Despite being the younger of the two, she was taller and a little more heavyset than her pudgy sister. Compared to her sister, her fur had a shade more purple to it, closer to magenta, and her hair was a bright violet color, reaching down to the back of her shoulders. She also wore even less than her sister, completely naked but for the flashlight held in her left hand, a belt pouch of her own, and the barbell piercings in her breasts.

Rhapsody wrinkled her nose as she looked around the storeroom, illuminated by her sister's flashlight. It was disappointingly empty. Some signs of water damage and mold on the walls indicated why; everything of value must have been moved out of the room a long time ago, well before the place was abandoned.

But other than a few boxes of junk, there was still one thing that stood out. Standing taller than either of them, with a sheet over it that was once white (but had long since become stained with age and damp), stood a floor-length mirror. With nothing else of interest in the room, Rhapsody walked over to the side of it and tugged on the less-dirty parts of the sheet, dragging it off the mirror.

The mirror was in surprisingly good condition for how long it must have been down there. The glass was clean, and the elegant golden frame still shining as though it had been recently polished. The reflection of Melody looked pretty good too... but when the rabbit in question struck a pose, putting one hand behind her head and the other on her hip, the reflection didn't follow her movement.

Melody frowned and leaned forward. "What's up with this thing?" she asked aloud, noticing that the reflected rabbit was just floating in a void and that the storeroom the real Melody was standing in wasn't featured in the reflection. She reached out and lightly tapped on the glass...

...only for her finger to sink through the glass as if it were a liquid.

Melody pulled her finger back, but the surface of the mirror extended to stay wrapped around her finger, and tugged her hand back, plunging it into the mirror up to the wrist. "Rh-Rhapsody! Help!" Melody called out, and her sister quickly moved behind her and put her arms around the younger rabbit's waist, trying to tug Melody away from the mirror.

The more they pulled, the more resistance they encountered, until Melody's foot slipped on the floor and she was pulled forward, tugging Rhapsody along with her. They both got flung face-first into the mirror, vanishing into the surface like rocks dropped into a lake, with only Melody's dropped flashlight and Rhapsody's camera left behind to leave any trace of them being there.

--------------------

Rhapsody groaned as she came back to her senses, sprawled on her front. Under her body, she could feel soft grass, and she felt the warmth of the sun on her back. Hazy memories came back to her; where was she? Had they been found and tossed outside? And where was...

"Melody?" Rhapsody called as she pushed herself up with her hands. Nothing hurt, thankfully, and the initial grogginess was going away quickly.

"Over here!" she heard Melody call, and she turned her head to the direction of her sister's voice. Melody was getting to her feet a short distance away.

"I'm glad you're safe." Rhapsody said as she got up. She reached for her belt, but it wasn't there – she was completely naked. Her satchel and belt pouch were gone, and looking over at Melody, she saw her sister in the same situation. Glancing around, she didn't see her things anywhere – both of them were completely naked and without any of their gear.

What she did see, however, was an orchard. The sisters had come to their senses amongst rows of tall trees, leaves rustling in a gentle breeze, branches hung heavy with heavy, bright red apples. The whole orchard was enclosed by high stone walls, far too tall for either of them to climb over even if one were to stand on the other's shoulders. The walls were bare of moss or ivy, the gray stone bricks looking smooth and pristine. At one end there was an equally huge gate, but it was shut fast.

The only other feature in the orchard was a multi-tiered marble fountain in the dead center of the area. Atop it was a masterfully crafted marble statue of a chubby rabbit – very much like the sisters – with her legs spread as a perpetual stream of water flowed from her slit and into the top tier of the fountain, where it flowed down to each successive tier until reaching the largest part at ground level.

"Where are we?" Melody was the first to ask. "I remember getting grabbed by that mirror, and then..."

Rhapsody cast her eyes skyward. The sky was clear and blue, with only a handful of clouds. It was as bright as mid-day, but she couldn't see the sun anywhere. The walls were too high for her to see much else. "I don't know, but I'd have to guess we're inside the mirror."

"Looks like our stuff got left behind... just as well we don't wear much to begin with, isn't it? At least we won't go hungry." Melody observed as she looked up at one of the apple trees. "Let's take a look around."

There wasn't much to look at. Some of the trees had green apples instead of red, but otherwise they were laid out neatly, and the walls had no apparent flaws and certainly no handholds. The trees nearest the wall were too far away to climb up to get over, and even from the top of a tree they wouldn't be able to see over the tops of the walls.

The only other thing of interest was the gate. Two huge, metal doors stood tall enough that Rhapsody's neck was sore when she tried to tip her head back far enough to look at the top. The stone walls continued up and around the door, presumably leading into a building of some sort beyond, rather than into whatever outdoor area lay beyond the walls.

"Hey, look at this." Rhapsody heard, turning her head to the left to see what Melody was pointing at. "There's a plaque next to the door on this side."

Rhapsody looked over, then glanced at the right side of the gate. "There's one here, too." she said, walking over and taking a look.

"'Eat and drink well to prepare yourself for the trials ahead.'" Melody read off the plaque. "Huh. Trials?"

"I think I might know what's going on." Rhapsody remarked. "There are stories about places like this – dungeons or labyrinths hidden inside of other objects. Get all the way through, and you get some kind of reward." 

Melody came over to read the other plaque, raised an eyebrow, squinted, and read again. "'The Mirror Labyrinth, Version 0.2.1. Copyright 1969-1972.' What the...?"

Rhapsody shrugged. "Let's not think about it too hard."

"Ooooookaaaaaaay... so, how do we get inside?"

Rhapsody looked down at the wall. Below the plaques were two U-shaped wooden channels that ran into holes in the wall, one on each side of the door, only two inches across. Bending at the waist and peering into the hole, she could barely see the bottom of what looked like a miniature water wheel. She tried to reach inside, but she couldn't get her whole hand in, and her fingers were too short to reach it.

"There's some kind of mechanism in here," she told her sister, "but I can't reach it. Kind of looks like a water wheel."

"There is that fountain back there," Melody suggested. "I don't have anything to carry water in though."

"Me either. I'd just end up spilling it if I tried to carry it in my hands."

The two of them checked around for another minute, but finding no further leads, they headed back. Splitting up, Rhapsody and Melody gathered an armful of apples each from the trees, meeting back up at the fountain, piling their apples on the grass in front of them to share.

Melody picked up a green apple and bit into it with a loud, satisfying crunch. It was at the peak of ripeness; crisp, sweet, and juicy. The two of them ate their way through several apples each, tossing the cores into the grass since they had nowhere else to put them. When she started to feel full, Rhapsody turned and bent over, resting on her knees, peering into the fountain water. It was crystal clear, the pristine bottom of the fountain clearly visible – like the rest of the place, it looked like it had never been touched.

Rhapsody brought handfuls of water to her mouths to drink, in lieu of having any proper containers, but Melody simply leaned over and stuck her face into the water to drink deeply, wiping her mouth clean and taking a seat at the fountain's edge afterwards.

"Well, that was refreshing," Melody remarked, "but we're still stuck out here. Now what?"

Rhapsody grimaced. She could feel a cramp in her gut, the tell-tale sign that nature was calling. There was nowhere out in the orchard to take cover, either, so she'd just have to try and hold it in. "I don't know, uh..." she responded, "Maybe if we look around..."

She trailed off as she saw Melody squirming in her seat on the edge of the fountain uncomfortably. Melody noticed her sister looking, and chuckled nervously. "Oh, uh, don't mind me," she said, "Guess I should have gone before getting sucked into a weird mirror world..."

"You too?" Rhapsody asked, focusing for a moment. "You need to go badly?"

"Y-Yeah. Real bad." Melody admitted with a blush.

"Okay, there's no way that's a coincidence." Rhapsody looked at the apple cores lying nearby. "Those apples..."

Her thought got cut off as she felt another spasm in her gut. In the span of a couple of minutes, she'd gone from totally fine to feeling like she'd been holding it in for hours.

"Let's at least go to the trees first," she said hurriedly as she stood up.

Melody nodded, getting up and awkwardly shuffling forward as quickly as she could with her legs pressed together. She followed along briefly, intending to split off from her sister to at least claim what little privacy she could get.

But neither of them made it.

Melody gasped and stopped suddenly, falling to her knees on the grass as she spread out her legs. "Sorry...!" she managed to gasp out, before groaning as a heavy stream gushed from her pussy and splashed on the grass and dirt below. Strangely, it was as crystal clear as the fountain water behind them, as though Melody had been chugging water all day – which Rhapsody knew she hadn't been.

That thought was cut off as she felt a strong reminder from her own body that she was in a similar situation, with another pang from her bladder. Not wanting to wet herself, she spread her legs apart, her need so strong that she barely relaxed at all before she started to piss onto the grass below. She groaned in relief for a moment before looking down at herself, where she saw the stream of her own fluid was just as clear as Melody's.

"Couldn't hold it any more..." Melody groaned out as she continued to relieve herself on the grass. Having given in to her need, she was kneeling in a more relaxed position now, eyes closed.

"Neither could I," Rhapsody responded, trying to reassure her sister. She couldn't shake the feeling that something was off, though; there was no way she should have needed to pee so badly, nor so clearly. Was this even piss? After a moment of thought, she brought the pinky finger of her left hand close to her stream, very briefly splashing the tip, before bringing it up to her nose experimentally.

"This is just water!" she exclaimed. "Pure water... just like from the fountain!"

"What?" Melody asked as she opened her eyes, looking down at herself and bending her upper body a bit. "You're right... what's going on?"

Rhapsody tried to cut off her stream, clenching her muscles, but it resumed of its own accord immediately. Regardless, a grin crossed her face as she looked over to the gates. "I think I have an idea for how we can get out of here."

Her grin disappeared moments later as she felt another cramp in her gut – of a different kind. What was happening to her body? Before she could voice that question out loud, she heard Melody gasp as her sister flopped over onto all fours, her butt bared and her tiny tail held high as her stream of piss – water, Rhapsody corrected herself – trickled to a stop.

"Y-You might want to back up a bit," Melody gasped out, clenching her rump to try and stave off the inevitable. "There's more, and... oh, there's a LOT more... don't look, please...!"

Rhapsody, however, couldn't look away. Her gaze was fixed on her sister's rump where, defying all explanation, she saw something bright green under Melody's tail. Something hard and smooth, yet also partly transparent, like glass or a gemstone or a crystal.

Even as Rhapsody felt the cramp that told her she had run out of time, and she instinctively squatted down over the grass, she couldn't look away. "I can't...!" Melody cried out, and then a groan escaped her lips as her resistance ended. The rest of the object was pushed out of her ass by her inner muscles, and Rhapsody saw a large green crystal, all of its edges smoothly rounded, slide out until gravity pulled it the rest of the way and it fell down onto the soaked grass with a quiet thump.

Rhapsody groaned as she felt something hard pushing its way out her own ass, rectal muscles clenching and squeezing. Her sphincter stretched around the smooth surface as she stayed squatting, still in shock at the sudden changes to them both. Looking forward, she saw another crystal, this one blue, getting pushed from Melody's rump slowly. When it fell, it landed on the first with a hard clacking sound, making the rabbit that had just produced it gasp in surprise.

"What was that?" she said as she turned her head to look back, "What am I...?"

"They're crystals!" Rhapsody said aloud as she groaned and dropped the first of hers on the grass, another one right behind it and stretching her ass out again. "I don't know how, but..."

Taking deep breaths, the two of them remained where they were as they gave in to their needs. A small pile of crystals accumulated under each of them as they both excreted the hard, smooth objects one after another, each one clattering to the ground as it landed on top of a pile and slid down to the ground below. After the initial shock, Rhapsody found it wasn't so bad; since they were so smooth and rounded, the crystals didn't hurt on the way out.

Finally, after several seconds without feeling any more crystals forcing their way out of their asses, Rhapsody got to her feet and helped Melody up to her feet.

"Okay, this is definitely weird." Melody said as she looked at the ground. "I just pissed out like a gallon of water, and then pooped like ten pounds of crystals. And I still feel like I've gotta go, but just not desperately."

Rhapsody nodded in agreement. "I'm feeling the same, but I think we can get out of here now. Maybe we can figure this out after that."

"Yeah, you had an idea! What was it?"

Rhapsody beckoned for Melody to come after her, leaving the piles of crystals behind – she wasn't concerned about trying to bring them along, given that she felt like she was carrying plenty more around inside of her. The two of them went back over to the gate, and Rhapsody gestured to one of the wooden channels sticking out from the wall.

"I get why that sign said to eat and drink first, at least – we can get these water wheels going. We ARE the water containers."

Melody blinked in surprise as she considered that. "That... makes sense, okay. Who would make a place like this?"

"Let's worry about that later. Come on, give it a try with me. Let's try to pee at about the same time."

Melody took the left one and Rhapsody positioned herself on the right, both of them pressed close to the walls with their legs straddling the U-shaped channels protruding from the wall. "Ready?" Rhapsody asked, and when Melody replied in the affirmative, Rhapsody counted down and they both tried to relax at the same time.

Seconds apart, two heavy streams of clear, fresh water spilled out from the rabbit sisters' pussies, splashing into the wooden channels. It flowed into the holes in the wall past the water wheels inside, pushing the paddles and making them turn. At first nothing happened, but after several more seconds they heard a loud click, and then, slowly, with the groaning of metal, the two huge doors began to swing inward, opening at last.

"Yeah, we did it!" Melody cried out in excitement, before glancing down. "But... I can't stop."

As the doors continued to open, the two rabbit sisters remained where they were, standing and pissing into the holes in the wall, the gentle trickling of their streams as they splashed and flowed over the wood getting completely drowned out by the noise of the door. Eventually, although she certainly didn't feel empty, Rhapsody was able to stop peeing and took a peek inside of the door.

Inside was a long stone-walled corridor lit by torches on the walls, stretching into the distance, slanted downward to descend underground. Melody joined her a few moments later, frowning.

"Are we sure we want to go in there?"

"I don't think we have any other choice." Rhapsody responded. "We're only going to get answers in there, and there's nowhere else to go. If there's a way out, it'll be in here somewhere."

She headed inside with Melody following close behind, the two naked rabbits descending into the labyrinth.

--------------------

Their progress was slow at first. Not because the dungeon was dangerous or difficult to traverse – far from it. In fact, the downward corridor was almost completely featureless and devoid of any other life. Rather, every so often they had to stop as they found themselves unable to hold in their bladders or bowels, sometimes both, and had to stop to relieve themselves on the floor for a lack of anywhere else to go.

The first time, the rabbit sisters did their best to look away from each other as they squatted at the sides of the corridor with their backs to each other, trying to ignore the splashing of their water and the clattering of the crystals they were producing. The downward slope was too shallow for the crystals to go far, but their streams of water ran downward over the stone floor for quite a distance, spreading out and darkening the stone wherever it got wet.

The second time, Melody had stopped caring. "Hold up, gotta piss again." was all she said to Rhapsody before spreading her legs, using the fingers of one hand to spread open her pussylips, and unleashing her stream all over the floor in front of her, watching it flow down the sloped tunnel.

Rhapsody stared for just a moment before shrugging and adopting a similar stance beside her sister. "Seems like this is going to keep happening, so we might as well get used to it." she mused aloud as she followed suit, pissing her perfectly clear stream of water almost as far as Melody's. 

"It's a good thing there's no monsters or anything in here." Melody joked after a few moments of listening to their splashing water, "I don't think they'd be willing to put a fight on pause for a pee break."

Rhapsody gave a little chuckle. "If you held it in long enough, you could use a desperation attack."

Her sister laughed briefly, and then they stood there for a minute or so, soaking the ground in front of them together until they finally ran out and their streams trickled off. Melody tried to carefully walk on the dry parts of the floor, but Rhapsody strode forward through the wet patches, shrugging when Melody looked back and gave her a questioning look. "It's just water," Rhapsody explained, "No need to be afraid of it. Come on, I think I can see the end of this tunnel."

After a little more walking, the tunnel opened up into a bigger room – the floor was the same color as the tunnel, making it hard at a distance to tell where the tunnel ended. Inside the room there were several statues of more naked rabbits just like the two of them, each one on a square stone pedestal, though the lack of color and the varieties of hair styles made it hard to tell if they were actually supposed to represent the sisters or just look overall similar to them. Each statue was in a different pose and all of them were holding small jugs that were carved from the same stone the statues had been wrought from. At the far end of the room was a large pair of stone doors – firmly closed and with no immediately apparent way to open them.

Within moments, Melody folded her arms and grinned. "Well, this one's obvious." she asserted confidently, "We've got to pee in the jars and fill them up."

"Are you sure? That seems a little too obvious."

"It's the first puzzle," Melody said with a dismissive wave of her hand, "Of course it'll be an easy one."

"Second, technically, but that makes sense," Rhapsody agreed. The closest statue was of a rabbit girl on one knee, holding a jug that was on the ground. That position made it easy for Rhapsody – she walked over and lifted one foot to put it on the other side of the jug, squatting down so it was between her legs. It took only a moment to relax enough for her to start pissing with surprising force, as though she'd been holding it in all day long, rather than merely a couple of minutes. Her water splashed in the jug loudly as it filled up rapidly, and when it got to about half-full, the whole statue and the pedestal it was on seemed to sink into the ground by about an inch. It took another few seconds for Rhapsody to stop peeing, accidentally spraying the sides of the jug with her stream.

"That was easy enough, looks like you were right." Rhapsody said as she stood back up, looking around. "What's next?"

"These ones will be trickier." Melody remarked, looking down the row of statues; the rest of them were holding their jugs in less-accessible locations.

Rhapsody moved along to the next statue in line. It was holding its pot at waist-height on a 45-degree angle, so she first tried to stand as close to it as she could. But the lip of the jug made the position difficult, so instead, she turned around, bent over and backed up, pressing her rump against the opening of the jug. Shifting her legs apart slightly, she relaxed her muscles and unleashed her stream inside of the pot, where it drummed on the inside for a moment before starting to splash, filling up slowly.

Melody moved on past her sister while she was busy, to the next statue. That one was holding the jug under one arm, with the opening tucked between its elbow and side, a little higher than Melody's waist. Even on her tip-toes, she wasn't able to get her pussy high enough to be able to pee into the jug. She stood for a moment, listening to her sister's water splashing inside the previous statue, before she put her arms on the statue's shoulder, lifting a leg and slipping her foot into the gap between the statue's arm and side. Pulling herself up, she managed to position herself over the rim of the jug – or so she thought; when she relaxed enough to start pissing, she heard it splashing against the pedestal below first, and quickly pulled her hips up. Soon she heard the hollow sound of her water landing inside the jug, and stayed in her position, arms holding herself steady, until she could feel the statue sink into the floor.

Meanwhile, Rhapsody had finished at her statue and saw Melody having to get creative at hers. The next statue along was hugging its jug against its front, with the opening on the container nestled just under the statue's breasts. After a moment to prepare herself, Rhapsody began climbing the statue – she'd climbed a lot of trees before, and this turned out to be not so different. The statue was smooth but she was able to get a grip on its shoulders with her hands, standing on the statue's arms. It was awkward, but sufficient – after relaxing for a few moments, she started to pee once more, despite all that she had unleashed into the previous statues. Water sprayed from her urethra onto the statue's chest, but fortunately the shape of the carving channeled her stream down its cleavage and into the jug held below, trickling in over the rim and running down the inside of it silently.

As Rhapsody was holding still to continue peeing into the jug, she heard Melody's voice. "Sis? I think this last one's going to be tough."

Rhapsody glanced over as she held onto the statue. The final statue was holding the pot balanced on its head, both arms up to hold it in place. "Oh, yeah. How are we gonna do that one?" she wondered aloud, thinking on it for a few seconds before her concentration was broken by the statue she was on sinking downward.

Melody stood next to the statue – it was about her own height, since the statues seemed to be closely modeled on the two rabbits. Rhapsody soon came over as they stood side-by-side, looking up at the jug. "I'd climb up there, but there's nothing really to hold onto."

"I don't think that's a good idea." Rhapsody replied, "It'd be really hard to stop you from falling if you started to tip." She thought for another few moments, then smiled as a solution came to her. "I know! Get behind it, then let me stand on your shoulders. I can hold onto the jug, you hold my ankles."

Without any better ideas, Melody squatted down to let her sister climb up onto her shoulders, as Rhapsody clung to the statue's arms. As Melody slowly stood back up, Rhapsody moved her grip up the stone arms, trying to put some of her weight on the statue to take it off of her sister. Finally, with Melody standing up straight, Rhapsody was able to lean forward, putting her hands on the rim of the jug and holding it firmly, leaning forward.

"Careful!" Melody hissed as she leaned in too, pressing her front against the statue's back to keep herself from wobbling so much.

"I'm trying, this is hard." Rhapsody said back. She was barely able to get herself into position with her pussy hovering an inch above the jug, but she only needed her urethra to be past the rim for this to work...

It was an awkward position, and it took a bit longer for Rhapsody to relax her muscles enough to pee once more. It was starting to become second nature to her, after doing it so many times in a short time span. The first bit of it trickled out and fell downwards before Rhapsody's stream picked up; those first few drops landed on Melody's head and she shook it in reflex, shifting back slightly.

"Eugh, Rhapsody! Be careful!"

"It's just water!" Rhapsody fired back, unable to stop herself from peeing even though she was too far away now and was washing down the statue's back.

"Right... sorry." Melody said as she moved forward again, until Rhapsody was able to aim into the jar again, her heavy stream soon splashing loudly as it filled the container. "Still getting used to it, you know?"

The two were able to stay stacked up as Rhapsody continued to pee into the jug, until it was filled enough to satisfy the puzzle. The sudden downward shifting of the statue and the dais it was on made Melody stagger a little, making Rhapsody miss the jug again, spraying the statue and her sister with a full-strength stream this time until she got back into position, waiting for her piss to come to its natural end. As they waited, they heard a grinding sound from the other end of the room; Rhapsody could see over the statue that the doors at the far end were slowly opening.

Once her stream trickled off, Melody squatted back down to let Rhapsody climb off her shoulders. "I'm glad that worked," Melody said as she rubbed her shoulders, "I'd hate to have been peed on for nothing."

"Get over it. It's water, that's all." Rhapsody repeated, shaking her head. "Let's just get going. I don't know how big this place is."

--------------------

The corridor to the next room wound back and forth, but was short compared to the long tunnel that had taken them down below the surface in the first place. Much like the first one, the room was a large open space with statues of naked rabbits, arranged into two lines that headed towards a pair of doors on the far side of the room. This time, however, they were holding asymmetric sets of brass scales – on one side was a solid ball serving as a weight, and on the other was an open container shaped vaguely like a bucket.

Melody folded her arms. "This one's easy too." She declared. "What gives?"

Rhapsody shrugged. "Just making sure we know what we can do, I suppose. It might be more necessary if we weren't already emptying ourselves every ten minutes or so."

Striding over to the first statue on the right, Melody suddenly turned and grinned at her older sister. "Want to race?"

"Race?"

"Yeah! There's two rows here, let's see who can do theirs first."

Rhapsody laughed and moved over to the first statue on the left. "You're on." she replied confidently, stretching her arms above her head.

"Okay, on three! One... two... three!" Melody cried, immediately dropping down into a squatting stance. Rhapsody followed suit, and the two sisters started their race by both relaxing their muscles, urging their bowels to move. Rhapsody was the first to groan as she felt a smooth crystal breaching her rear hole and spreading it out, and she heard it clattering to the ground a moment after it left her. Only then did she think to look up at the scale next to her, unsure of how many crystals she was going to need, staying in her squatting position as she kept clenching her muscles, pushing more crystals out from her ass and onto the floor behind her.

"Better get moving, sis!" she heard Melody call, and looked over – her younger sister was already on her way to the second statue. Cursing under her breath, Rhapsody clenched her anal muscles to force the current crystal out onto the pile, standing up as soon as she did. She had to clench again to stop any more from exiting, and even then still felt another crystal poking at the inside of her sphincter. Quickly, she grabbed one of the still-warm crystals and dropped it into the bucket on the scale, adding a second crystal after it was clear the first wasn't enough. With the scale balanced, the statue and its platform sank into the ground, and she grabbed the extra crystals before hurrying along to the next statue.

Unfortunately, her extra two crystals weren't quite enough – but it looked like she would only need one more. Glancing over, she saw Melody squatting once more, building up quite a sizable pile of crystals under her rump, her anus stretched by a purple one that was only partway out. Rhapsody, still feeling the crystal right at her anal opening, got an idea, and bent her hips slightly, reaching back with one hand as she stopped resisting the crystal's exit. Almost immediately, she felt it moving and spreading her tailhole, and she kept her hand ready to catch it. She took deep breaths as she squeezed with her muscles to push it out, and once at the halfway point the smooth crystal popped from her hole and into her waiting hand. Triumphantly, she dropped it into the bucket on the scale and watched it balance with the plate, making the statue sink down into the floor.

Out of crystals, Rhapsody quickly moved on to the final statue, reaching out and testing the weight of the plate and the weights that were a part of it. It was extremely heavy; she was going to need a lot of crystals to balance this one out, so she squatted down one more time next to the statue and tried to relax. Groaning quietly, she felt the crystals moving inside her gut very soon, and she let them move – she was starting to get the hang of what was certainly an unusual skill, and had found that trying to clench and force the gems out didn't help as much as just letting them work their way out of her ass at their own pace.

Soon, the first crystal clattered to the ground, followed by another one shortly after that. Rhapsody closed her eyes and breathed deeply, letting her body take over, counting off the crystals on their way out of her sphincter. Six, seven, eight... was that enough? Rhapsody considered stopping to check, but the crystals were coming out rapidly now, the next one starting to exit as soon as the previous one had fallen from her rump. It would be better to have too many than too few, as well, so she stayed where she was, listening to the crystals clinking off each other as more and more of them were pushed through her anal passages.

She lost count, and looked over to Melody again – she was starting to add crystals to the last scale! Rhapsody tried to clench her muscles to stop, but one last crystal that was partway out wouldn't go back in, so she pushed with her muscles to force it out and onto the pile before she got back up. Quickly, she grabbed them and started to pile them into the bucket, but it wasn't enough; moments later, she heard "Finished!" from Melody as her sister triumphantly stood by the now-descending third statue.

It had only been for fun, so Rhapsody wasn't terribly put out, but she did become frustrated when she dropped the eleventh and final crystal into the bucket and it still wasn't quite enough. Melody was at her side, giggling, holding one last crystal, and reached up to drop it into the bucket, which was enough to finally balance the scale.

"Well, congrats." Rhapsody said as she folded her arms, turning to her sister. "Clearly, you're better at competitive pooping than I am."

Melody burst into laughter at Rhapsody's words, the doors leading forward slowly grinding open. "Now there's a title to put on my resume!"

Rhapsody chuckled as she started to walk, Melody soon following along. "If you want my Champion Pisser title, you'll have to pry it from my cold, wet hands. Now, let's get going..."

--------------------

After a short walk, the two of them reached another large room. They stopped dead upon entering and stared; the room was divided into two sections by a trench in the floor, from which a six-foot high wall of flame was spewing out.

"I hope they don't expect us to put that out by peeing on it." Melody remarked, making Rhapsody snort in amusement.

The far wall on the other side of the line of fire had several circular stone protrusions, painted to look like large targets, at different heights and sizes. The bullseye of each target bore a number from 1 to 8, starting with the biggest target and counting down to the smallest one.

Rhapsody looked at the targets, then started looking around the rest of the room. There wasn't really a lot on their side of the flame wall, however, other than the doors in and out, with the doors outward standing firmly closed as usual.

"What a great time to not have my bow." Rhapsody muttered in annoyance.

"We'll have to just throw something."

"Like what?"

Melody's hands drifted to her belly, rubbing at her stomach. "Like... crystals?"

Rhapsody raised an eyebrow. "Well... sure, we don't have any other projectiles, but those things are heavy, and they're not perfectly round-"

Melody wasn't listening; instead, she was bending at the waist, putting her hands on her knees, her tiny rabbit tail twitching. "Look, my ass is full of them again anyway, so you might as well try it." Moments later she groaned as a bright red crystal stretched Melody's anal opening from within, spreading it out as it slid out rapidly. Without thinking, Rhapsody reached out in reflex and grabbed the crystal before it could fall to the ground, trying not to think too much about where it came from.

Rhapsody took aim as best she could and made a big overarm throw, chucking the crystal through the wall of flames. It was smooth but not round, and turned over and over as it sailed through the air. It struck one of the outer rings of the target she was aiming at, which was apparently good enough – the whole stone target sank into the wall a bit with a grinding noise, and the crystal fell to the ground, somehow remaining intact despite the abuse.

"I'm not very practiced at this, but at least these are big targets... Melody, give me another."

"Get it yourself!" Melody replied with another groan – in the time it had taken Rhapsody to throw, two more crystals had fallen to the ground, with a third halfway out of her sphincter. With a sigh, Rhapsody grabbed the third one just as it fell, and turned her aim to the next target. Her throw went wide and the crystal hit the wall, falling to the ground underneath with a clattering sound.

Rhapsody reached out for another crystal. When one wasn't forthcoming immediately, she glanced over at Melody, and then gave her a light smack on the rump playfully. "Gonna give me another one, or do I have to pick them up off the floor?"

Melody snorted and gave a short laugh, wiggling her hips as she started to push out a bright purple crystal from under her tail. "Never thought you'd be so eager to get your hands on my poop," she joked.

Her sister laughed as she grabbed the purple crystal once it fell, trying to take aim. "This is different and you know it!" she said, raising her arm.

"Even if they're hot and fresh?"

Rhapsody snorted, throwing off her aim. The crystal sailed wide and struck the third target instead of the second one, and with a grinding sound, both it and the first target slid back out of the wall. Fortunately, nothing worse befell them than having to start over.

"Good thing we've – nnh – got lots of ammo, huh?" Melody remarked as another crystal was pushed from her ass, falling to the pile on the ground.

Rhapsody shook her head and sighed. "Okay, smartass, you give it a try then."

"Maybe I will!" Melody replied, standing up straight. "Bend over and give me some crystals."

Her sister complied, taking a breath to relax. Her guts didn't need much persuading to get moving; soon, she felt a crystal passing through her bowels and out of her tailhole, stretching it as it passed. She exhaled as it left her, falling into Melody's waiting grasp. Rhapsody watched, unable to stop herself from continuing to excrete more crystals onto the floor below, instead just letting it happen and listening to the rattling sound they made as they struck the stone floor.

Melody took aim and hurled the crystal at the first target; the smooth green stone struck one of the outer rings, and Rhapsody smirked. "Not doing much better than I did," she quipped, "Better come grab another crystal, I feel it coming."

"Nah, I've got my own." Melody replied, and Rhapsody glanced over – she had forgotten that Melody had produced far more crystals than had been thrown. "What- Melody!" she blurted out, "Then why did you need me to make more?"

"Because it's funny!" was the reply, Melody grinning wide as she picked up a crystal, hefted it, and hurled it at the second target, striking one of the inner rings. "Thought I'd pass up an opportunity to mess with you?"

Rhapsody squatted down to make it easier to pass the crystals, the change in position letting her anal muscles push them out faster. She groaned as they piled up underneath her rapidly, slipping out from her one after another. "Or maybe," she said as her sister lined up another shot, "You were 'eager to get your hands on my poop'?"

Melody burst into a laugh as she threw the crystal, missing so badly she hit the first target again. The puzzle reset once more, and Rhapsody grabbed one of the crystals under her before standing back up.

"Okay, let's focus, or we'll be here forever." Rhapsody said as Melody calmed down. Gesturing to the two piles of crystals, she continued, "We've got enough ammo now, so let's get this over with."

"All right, all right. Let's take turns." Melody said, picking up one of her crystals. "Me first!"

The first few targets went easily enough as they hurled the colored crystals at the far wall. The smaller targets towards the end were much harder to hit, but were spaced further apart, so they had no further mishaps with hitting the wrong targets. The last one proved particularly tricky, with the two sisters taking turns hurling crystals to try and get it. Just as their piles were starting to get extremely low, Rhapsody finally managed to nail the target with a hard throw, the crystal bouncing off the target and clattering to the ground.

"First try!" she exclaimed jokingly, pumping her fist, making Melody snicker. The flames abruptly disappeared, though the air around the trench remained hot, and the doors on the far side started to open up.

--------------------

The first sign of trouble was when the passage forked, branching to the left and right. After some debate, the sisters both went to the right, and continued when they hit an intersection – Rhapsody had heard that you could get through any maze by just following the right-hand wall.

They lost track of time as they walked through the maze, taking every right-hand turn they could. While they had to occasionally stop to pee on the floors, dump piles of crystals, or both, the fact that they had never yet come back to one of their previous relief spots at least meant that they weren't going in circles. Still, they had spent a lot of time wandering around without any sign of the exit...

Stopping to rest, Melody leaned against the wall at a 90-degree turn in the passage. "I'm getting really thirsty," she complained, "And there's no water anywhere. Why are there no fountains around when you need one?"

Rhapsody nodded in agreement as she sat down and leaned back. "Same here. I guess it shouldn't be surprising that we're thirsty considering we've pissed about thirty times our body weight in water by now – or more surprising that we're not even thirstier than that. It's ironic – I'm extremely thirsty, but I'm also bursting to pee at the same time."

"This place is weird." Melody muttered. "Well, since we're stopped, guess we might as well, uh... hmm."

Rhapsody looked up at Melody, who seemed to be lost in thought. "What is it?" she asked, "Do you have an idea for getting out of here?"

"Not that, but..." Melody looked away from her sister. "Well, since we're both thirsty, we both have to pee, and, uh, since it's just water... I was thinking..."

An awkward silence held for a few moments, before Rhapsody's eyes widened as she understood what her sister was getting at. "Really?" she said in disbelief, "It's a bit weird, and sure, we don't have many other options, but... you were making such a fuss about it before."

"I know! But... I'm super thirsty. I can't think straight. I don't really want to, but I don't have much choice. And like you said, it's just water, and..."

Getting to her feet, Rhapsody patted her sister on the back. "It does make sense, and for all we know, whoever made this place was expecting it. We don't have anything to hold it in, though, no cups or glasses."

"Yeah, so..." Melody's cheeks flushed as she arrived at the same conclusion. "I'll, uh... have to drink it from the tap, won't I?"

"I guess so... well, let's get it over with." Rhapsody said with a sigh. "How are we going to do this?"

"Just stand there," Melody said as she got down onto her knees. "Let me get into position, and... I'll try not to think about it too much."

To say it was awkward for them to line up while both trying not to look at each other would be an understatement. Rhapsody put her hands on her hips, kept her head up and held her gaze firmly on the ceiling – or rather, the blackness that the walls eventually ascended into where a ceiling presumably resided. Melody, meanwhile, kept her head down, looking at Rhapsody's thighs to gauge where her head should be, before she finally closed her eyes and lifted her head, guessing and hoping her judgement was good.

"I can't hold it much longer." Rhapsody mumbled. "You ready?"

"Ready as I'll ever be."

"Okay." Taking a breath, Rhapsody did her best to relax. But try as she might, she couldn't will herself to start - it was one thing to talk about peeing for her sister to drink from, but actually doing it was quite another.

"I'm waiting..." Melody teased, sensing her sister's hesitation.

"It's weird, okay?" Rhapsody blurted out, "I have to pee really bad, but knowing you're there, I feel..."

Melody gave a little hum in thought, then smirked to herself. "Why don't you just pretend I'm Lomi?" she remarked in a playful tone, "I bet you piss on your boyfriend all the time, that should get you going pretty quick."

Rhapsody gave a huff, wanting to chide her sister, but instead let her mind wander as she tried to picture that scenario. As she turned her attention away from Melody, it didn't take much before her bladder began to empty, taking even her by surprise. Warm, clear water flowed from her urethra in a stream that completely missed Melody's mouth, striking the bridge of her nose and soaking her face.

Sputtering, Melody pulled her head back and shook it, spraying water to the sides, but now Rhapsody's stream was just splashing all over her breasts and running down her front. "Stop for a moment!" Melody blurted out, shifting back to get out of the spray.

"I can't!" Rhapsody replied after a moment, raising her voice to be heard over the splashing of her water on the floor. "It won't stop... just hurry up and drink."

Melody grumbled briefly, but moved her head forward again as she leaned closer, opening her eyes a tiny bit, keeping her gaze downward. Trying to pretend she was just drinking from a tap faucet, she tilted her head a bit and moved her muzzle forward until she caught the stream in her mouth.

She was still surprised to discover that it tasted just like ordinary water – pure water, even, the kind she'd find in a plastic bottle or a filter jug. Other than being warm from being inside of her sister, it really was just ordinary water, so she closed her eyes and started to drink heavily to slake her thirst. Rhapsody, meanwhile, kept her gaze upward, trying to think of other things, not noticing as her mind wandered that she started to sway a little on the spot, splashing the side of Melody's face before her sister could move to adjust again. It was a bit difficult for Melody to drink so much so rapidly, but after guzzling down a considerable amount of water she pulled back with and wiped her mouth with her hand.

"Okay, I'm good." she said as she got back to her feet. "But you're going to want to hurry if you want me to return the favor, I'm absolutely bursting to go now."

Rhapsody's flow trickled off to a stop as she started to get down onto her knees in front of Melody, who spread her legs as she leaned back against the wall. However, as Rhapsody was getting into position, she heard Melody gasp, and without a verbal warning she suddenly started to pee, unable to hold it in any more. Clear water gushed from Melody's pussy, splashing Rhapsody's belly and legs briefly before the elder sister got her head into position to start drinking.

A minute passed as Rhapsody drank, and Melody did her best to ignore the sound of her sister swallowing, instead trying to focus on the sensation of relief she was getting from pissing so heavily. She had initially lost control, but now was relaxed enough to continue normally. Or so she thought – once Rhapsody pulled away, Melody tried to clench her muscles to stop, but her stream only waned temporarily before going back to full strength.

"I-I can't stop." she admitted, looking down at herself as Rhapsody got to her feet, seeing her stream of clear water splashing down onto the sandstone floor. "I think we're going to have to wait this out."

Rhapsody took it in stride. "It seems like the more 'full' we are, the less control we have over it until we empty ourselves all that much more." she mused. "When we're not overfull we can start and stop more or less at will, but if we build up too much, we have to let it out."

"Sounds about right?" Melody replied with a shrug.

"This might be important somewhere in this place." Rhapsody observed. "Take your time, then we'll head on out. Hopefully we can get out of this place before we get hungry, I can't eat crystals."

--------------------

Fortunately, the maze only lasted enough time to require one more pit stop – after a few short, sharp turns, the two sisters found themselves at a huge, open door. A quick glance inside told them that they thankfully had not ended up back at the start – the next room had a large and very elaborate colored mosaic on the floor, though they couldn't quite see what it was a picture of, if anything. The tiles were big and colorful, each one about six inches across, with no marbling or other variations to the color of them.

"Hey, look," Rhapsody pointed out as they walked closer, "This tile's missing a bit."

"This one too. There's a whole bunch of them like that."

Rhapsody got down on one knee to inspect the closest tile. There was a sizable divot in the middle of it, though it was smooth, as though it had been made like that in the first place, rather than chipped out after it was placed. It was vaguely oval, with rounded edges; about the same size and shape as...

"...those crystals." Rhapsody finished her thought out loud.

"Huh?" Melody asked, looking over at her sister.

Rhapsody tapped the inside of the divot in the tile. "I think that's what we need for this room – we've got to fill these holes with crystals."

Melody thought on that for a moment as she looked at another tile, then nodded. "Okay, that makes sense. But uh... we're going to need a lot of them."

"Good thing we seem to have an infinite supply then, isn't it?" Rhapsody retorted, shifting her legs so that she was squatting. "Between the two of us, it shouldn't take long."

Rhapsody's words proved true as the two of them relaxed, releasing their bowels; in an act they had become very accustomed to over the last few hours, both of them felt crystals sliding through their guts and stretching their anuses as they exited, clinking on the ground as they piled up. An awkward few minutes of silence passed as they both piled up a considerable amount of crystals behind them, both sisters in a squatting position with their short tails raised to let the crystals get pushed out of their asses, until Rhapsody glanced back and stood up.

"I think that's enough, at least to get started." she said, grabbing a white crystal and putting it in the nearest tile. Once rotated properly, it fit almost perfectly, with just a little bit of space around the edges – if she wanted to, she could have pressed down on one side to pop it back out of the divot it was in.

The two sisters got to work as they filled in the mosaic. It was bigger than expected, and the two of them had to stop briefly to make more crystals, squatting down at whatever part of the mosaic they were at to excrete another couple dozen of the smooth stones.

Finally, Melody slid the last crystal into place and stood up from her kneeling position. "All done!" she declared cheerfully, looking towards the exit doors.

They remained firmly closed.

After waiting a few seconds to see if there was merely a delay, Rhapsody frowned, folding her arms. "Well, that wasn't it," she observed, "There must be more to it."

"Do you think the colors have to match?" Melody suggested.

Rhapsody turned and looked back at the mosaic. They'd just been sticking whatever crystals fit in any tile without paying attention to color. But by chance, some of them matched, and it was a precise enough match that Rhapsody had to agree that her sister was onto something. "You're probably right." she said, "It makes sense. Okay, let's pop the ones that don't match out and pile them up by color so it's easier to handle."

Doing that took some time, and it was a little unusual to see piles of crystals that were all one color instead of the random selection that each of their piles had been so far. They'd also completely mixed together Rhapsody's and Melody's crystals, so hopefully it didn't matter which one had produced them. It took long enough that twice they had to stop to make even more crystals, which they did close to their arranged piles to make them easier to sort afterwards.

"Funnily enough," Melody remarked as she added more green crystals to the corresponding pile, "I haven't had to pee at all since we came in this room."

"Do you think the different rooms change our needs?" Rhapsody wondered aloud.

"Maybe. It makes sense, most rooms have only needed one of them. Or it might just be our bodies responding to whatever we're doing. The more we poop, the more we need to poop."

"Could be." Rhapsody said in agreement, looking at the piles and then out at the mosaic. "There aren't even any yellow tiles, are there?"

"Now that you mention it, I don't think I've seen any." Melody replied. "Sure are a lot of red tiles, though. And a whole bunch of blues."

Once the crystals were more or less sorted, they got back to filling in the mosaic. Melody went around to each empty tile and called out to Rhapsody, who would toss her a crystal so that her sister could put it in place. Together, they made pretty quick work of the room, and it was fortunate that the crystals seemed to be nigh-indestructible; on more than one occasion Melody fumbled the catch and the crystal would skitter across the smooth tiles on the floor, making her chase after it.

"Red!" Melody called out as they were almost done; just three more tiles remained.

"Uh... we're out of reds." Rhapsody replied. "What else do you need?"

"We are? Um... well, two whites."

Rhapsody picked up two more white crystals from the pile and brought them over, handing them to Melody. "Really? We're short ONE red?"

"Well, that's annoying," Melody griped, "Okay, let me make some more. Just tell me when I pop out a red one."

"Uh, okay." Rhapsody agreed hesitantly, watching Melody squat down just to the side of the mosaic. Sighing and relaxing, it took barely a few moments before a green crystal slid out from her tailhole, followed closely by a blue one, and then purple, the smooth colored stones piling up on the floor.

"Keep going." Rhapsody said as Melody gave her an inquisitive look. Melody continued to stay crouched, letting her body push crystal after crystal out from her ass, the smooth stones stretching her hole on the way out.

"A-Are there really no red ones yet?" Melody gasped after a couple dozen of them, wiggling her hips. She was starting to have to push now to coax more of the crystals out from her body, taking breaths and squeezing her anal muscles.

"Not yet!" Rhapsody called from behind her. "Trust me, I'll tell you when you make one."

Melody groaned, but kept going, determined to finish what she'd started. But the crystals started to come slower, even with her pushing and almost straining. Soon, she pushed, and felt nothing at all – for the first time since she'd eaten those apples up on the surface, she actually felt empty.

"Uhh... I think I'm all out." she said in bewilderment.

"All out? Is that even possible?"

"Apparently! I mean, I can try..." Melody took a breath and started pushing with her muscles again, seeing if she could squeeze out just one more crystal. Instead, she accidentally let rip with a long, rippling blast of air from her rear, her eyes going wide – but try as she might, she couldn't stop the thunderous fart until it ran its course, an awkward silence falling over the two of them.

"Oh crap, I'm sorry," she said quickly, "I didn't know-"

But Rhapsody was laughing. "Melody!" she gasped out, "What the hell? That was fresh air!"

Melody could only manage a flat "What" in response, looking back over her shoulder at her sister.

"I'm serious," Rhapsody said between laughs, "All the air around you is suddenly less stale and musty. It's like we're back outside all of a sudden. What's with this place?"

Melody chuckled a little as well, shaking her head. "Well, you're gonna have to give it a try," she said eventually, "My ass doesn't want to cooperate."

Rhapsody nodded as she settled down and stopped laughing, getting down onto her knees. It didn't take her long to start either, the rabbit taking a breath and relaxing as the first crystal-

"Oh, come ON! That's bullshit!" Melody called from behind Rhapsody before subsuming into laughter. "The very first one you made was red!"

Rhapsody laughed as well as she heard that, reaching back to spread her cheeks and push the red crystal out with a bit of extra force, sending it bouncing onto the floor. "Well, there you go." she said, trying to clench her muscles and stop – only to find she couldn't. "You go handle that, I'm gonna be here a while." Rhapsody mumbled as she stopped trying to fight it, letting a green crystal slide out from her rump.

"Cheater." Melody said playfully, sticking out her tongue and grabbing the red crystal. She turned around and put it into the divot in the file tile, and both of them were relieved to hear the sound of grinding stone as the doors leading out slowly swung open.

Rhapsody, meanwhile, had continued to drop crystal after crystal out from her ass, waiting it out. Melody turned back to her and stared, folding her arms and huffing. "Okay, now you're just showing off," she said with mock anger, "There's like three red ones there."

Her sister laughed and made an exaggerated shrugging motion. "I guess I'm just better at it than you are?"

Melody playfully cuffed her on the shoulder, and once Rhapsody finished, the two of them got up and left the numerous piles of crystals behind as they exited.

--------------------

"How much longer do you think this place is?" Melody asked as the two of them walked along another corridor, having just finished another break to poop a pile of crystals each that they were leaving behind them.

"How should I know?" Rhapsody replied. "There's no map or anything. I hope we don't have to backtrack, I don't want to go back through the maze again."

"At least it's been a straight line. We don't have any side paths to-"

Melody was cut off as the floor opened up underneath her; with a scream, she vanished from sight into the pit.

"Melody!" Rhapsody cried out, rushing to the edge of the pit and looking inside.

"Ow!" she heard from below.

"Are you all right?"

"I'm fine... I landed on my butt. It hurts, but I'll live."

"I can't see you. It's completely dark down there."

"It's not that deep! I can see you. It's pretty cramped in here, I can barely move my arms around." After a pause, Melody continued, "Hnngh... the walls are too smooth, I can't climb up."

"It's okay, I'll get you out... somehow..." Rhapsody said, thinking aloud. "Just... give me a minute."

She heard Melody making noise down in the pit as she tried to jump. "It's no use, it's too high to grab the edge."

"What if I lean over and try to grab you?" Rhapsody suggested.

"You don't have anything to brace on up there. I'd just end up pulling you in, and then we'd both be stuck, possibly with you on top of me."

Rhapsody sighed and sat back, trying to think of a solution. Once again, she wished she had some gear with her; a rope would be ideal for this. A few minutes passed as Rhapsody tried to think of something, and Melody did her best to search for a way out of the pit, feeling across the walls of it for any secret switches, but coming up empty.

"Uh... I think I have a problem." Rhapsody heard, breaking her train of thought.

"What kind of problem?"

"I've gotta piss again, like, really bad. But I'm stuck down here."

Rhapsody sighed, exasperated. "Melody, it's just water." she reminded her sister. "You'll get your feet wet. It's no big deal."

"But this pit is small, and... I'm not!" Melody protested. "And you know how much we put out!"

"Okay, so you'll get your ankles wet too, big deal. It's not like you're going to drown."

"If I'm down here long enough, I might pee that much! ...wait, that's it! If the water lifts me up, I'll be able to get out!"

Rhapsody stood up. "Yeah... yeah, that would work! You only need to be high enough to grab the ledge."

"Okay!" Melody said enthusiastically. Down in the darkness of the pit, she was about to try to squat, but realized that she needed to stay upright for once the water got high enough; instead, she spread her legs out and relaxed, a thick, heavy spray of water gushing from her pussy onto the floor of the pit. It splashed in all directions, soaking her feet, and she almost pulled away out of reflex. With nowhere else to go, the water spread out to the edges of the pit until it had completely covered the bottom, and then, slowly, began to rise.

"This is going to take forever." Melody groaned over the sound of her splashing stream.

"Do you want some help?" Rhapsody asked from above. "I've got to pee too anyway."

"You might as well!" Melody called back. "Just... try not to pee on me."

"You're getting wet either way." Rhapsody pointed out. Melody looked up, and saw her sister squatting near the edge of the pit. A clear jet of water sprayed from the older sister's slit and hit the side of the pit, running down the smooth stone to the bottom where it was added to the slowly growing water level.

For several minutes, both of them kept like that, with Rhapsody occasionally shifting her legs from soreness, until she simply stood up – her aim didn't need to be terribly precise. Filling the pit was putting their altered bladders' capacities to the test, as until that point, they had only been peeing out of immediate need or to do whatever was required to solve a puzzle.

As it turned out, they both had a finite capacity, though it was an impressive one – the water had gotten as far as Melody's upper thighs, and she was only pissing about an inch into the water by that point, creating a frothing jet of bubbles from the force of her stream until it began to trickle off. She pushed out all she could, clenching her muscles, but couldn't get more than a few final spurts.

"I... I'm all out!" she cried out to Rhapsody.

"I'm getting low too." Rhapsody replied with worry. As her own stream began to flag, she squeezed out everything she had, the final droplets falling short of the wall and landing in the water next to Melody, splashing her hand and leg with droplets.

"What do we do now?" Melody asked, biting her lip.

"Let's just wait a bit, okay?" Rhapsody replied, trying to stay calm. "You've seen how fast we fill up. I doubt we'll be empty for long. We've probably pissed enough to fill this pit several times over already."

Rhapsody took a seat by the pit, and Melody leaned on the wall behind her. They passed the time with some idle chatter, taking guesses at the Mirror Labyrinth's deeper workings, but before they could get very far into it, Melody interrupted Rhapsody's rambling thought about what might happen if they started lactating, and what kind of puzzles they might have bumped into.

"I just tried peeing again, and it's working!" Melody called up from the pit.

"That was fast." Rhapsody replied, and went to go squat beside the pit. Even though she didn't really feel like she needed to go, she tried relaxing her muscles, and sure enough, a heavy stream of water shot from her slit and into the pit below, as forceful as if she'd been holding it in all day long.

Very soon, the water was high enough that Melody's pussy was covered by it, the surge of warmth between her legs as she pissed being the only noticeable sign that she was still going. It reminded her of peeing in a swimming pool, a thought that made her giggle. Meanwhile, Rhapsody kept a steady stream running down the inside of the wall, letting her mind wander as she thought about the kinds of puzzles they'd already seen, and what they might see; the uses for her water, and for the crystals...

Lost in thought, she didn't pay any attention as she felt one of those crystals making its way out of her too, and out of pure reflex pushed it out with a squeeze of her muscles. It didn't occur to her what she'd done until she heard the loud "sploosh" from in the pit, and Melody's protest as the crystal splashed her with water.

"Rhapsody!"

"Oh! Sorry, Melody!" Rhapsody replied, clenching her muscles. Her stream stopped for only an eyeblink before picking back up.

Melody folded her arms and frowned up at the rabbit butt perched high above her as they kept going. Eventually – after another accidental crystal-drop into the pit – Rhapsody instead moved to sit on the edge of the pit, facing in, peeing against the opposite wall. With the water ascending around Melody's body, it was taking less time for the water level to rise.

They both ran out and decided to stop briefly for another break just as it got to Melody's neck; she would have to start treading water once it got higher, and she didn't want to have to do that while waiting to refill. After another short break as they tried to guess at how much time had passed since they entered, they began again, with Rhapsody spreading her legs and unleashing her stream onto the inner wall of the pit as Melody relaxed her muscles, feeling the warmth of freshly-pissed water between her legs.

Melody carefully kicked her legs to keep herself afloat as the water level rose, not wanting to tire herself out, putting her arms on the opposite walls to hold herself up. Slowly but surely, the rabbit rose along with the water level, starting to close the distance between the sisters.

"Hey, grab my leg!" Rhapsody said as Melody came within reach. "I'll try and pull you out."

Melody reached up with one hand and took hold of Rhapsody's ankle – but rather than wait, she instead grinned widely and tugged. The surprised Rhapsody slid on the floor tile and fell into the pit, landing in the water with a splash as Melody laughed, watching her sister surface and glare at her, legs kicking the water.

"What was that for?" Rhapsody demanded, as Melody gave a broad grin.

"It wasn't fair I was the only one getting soaked." she replied. Before Rhapsody could fire back, she reached up and quite easily grabbed the edge of the pit. "Also, your body displaced enough water that I can reach the edge and pull myself out now. Let's go at the same time, all right?"

Rhapsody didn't look pleased, but knew that if Melody left first the water level would fall again. "Okay, on three." she said grudgingly. "One... two... three."

With some effort, both rabbits used both hands to grab the ledge and start hauling themselves up. The floor of the corridor was rougher than the walls of the pit, and they were able to get enough of a grip to get their upper bodies out, then pull the rest of their bodies up over the edge.

Standing up, both of them were completely soaked and dripping water all over the floor. "I can't believe you pulled me in." Rhapsody began, her anger fading to a smirk. "But it did save us some time, so I'll let you off... this time."

"Sure thing, sister." Melody teased. "Let's just keep an eye out for any more traps."

--------------------

The next time they came to a door, a minute or so after they had to stop and leave two piles of crystals in the corridor, they found a tiny room featuring nothing but a downward set of spiral stairs. With nowhere else to go, they descended side by side, the stairway getting darker as they went.

Suddenly, they put their feet forward expecting to find more stairs, instead stepping onto the top of a slide. Melody slipped and fell first with a yelp, as Rhapsody tried and failed to keep her balance and was soon sent falling down after her moments later.

Both of them were dumped out into a large room, falling a short distance onto a smooth floor that looked like clear glass over the normal stone floors. Seconds after they both slid to a stop, but before they could get up, the glass shifted and turned into a gigantic mirror.

"Uhh... you okay...?" Melody groaned, sprawled on her front.

Rhapsody lifted her head, lying on her back. "I'm fine. Guess it's my turn for my butt to hurt."

She tried to get up, but her hand slipped on the mirrored surface. She tried to move her legs or push herself over, but every time she tried she simply slid on the glass, going nowhere. Melody's efforts to stand met with similar results, every attempt to push herself up ending with her sliding around on her front, tits pressed into the smooth glass surface.

"I can't move!" Melody whined.

"I can't either. Or, well, I can move, but I can't get anywhere." Rhapsody stopped struggling against the frictionless surface and stared up at the ceiling, which was plain stone that she could actually see for once. "Do you see anything?"

Melody peered around. "There are some walls around us, but they're mirrors too. But ahead of us – well, me – I think... I think I see a door, way off in the distance?" She squinted and soon added, "And I think it's open! The light's brighter there too, maybe that's the exit?"

"One heck of a final challenge." Rhapsody grumbled. "How do we get over there?"

"The floor is like ice, but... even more slippery." Melody hummed to herself as she mulled that over. "So if we can move even a little, we should just... keep going, right?"

Rhapsody extended her arms and tried moving them back and forth as though flapping them, but she didn't seem to be going anywhere. "Maybe if I had actual wings, this would work..."

Both of them went still as they tried to think of a way out of the problem. Rhapsody soon ran into another problem: the inevitable had happened, and she felt a growing need to relieve herself once again. Knowing it would just get worse if she put it off, she spread out her legs wide, lifting them off the ground to keep them out of the way, and starting pissing.

As the clear water sprayed from her slit, she kept thinking, staring up at the ceiling. But after a few seconds, she noticed something: she was moving. Not very much, but if she focused on part of the stone ceiling, she could notice herself sliding along the floor ever so subtly. Raising her head, she saw that her stream, once it hit the ground, didn't stop; instead, it slid along the surface of the mirrored floor, like raindrops running down a window. She wasn't going to get anywhere like this, but it still gave her an idea...

"Melody, I've got it!" she blurted out suddenly. "The crystals! Throw the crystals!"

"Huh?"

"If we could push off a wall, we'd keep going, right? We don't have a wall, but if you throw a crystal hard enough, you'll get pushed back the same way. So make some crystals and throw them!"

Rhapsody got to work following her own advice, cutting off her stream as soon as she was able – which wasn't for several more seconds. She focused instead on trying to instead get her bowels moving, keeping her legs up and spread, bent at the knees. With a little bit of effort – she was getting very well-practiced at it by now – she felt solid objects moving inside her, soon pressing at her sphincter from the inside. Relaxing, she let her anal muscles force the crystal out, and it quietly clattered onto the mirror below.

Reaching down with one hand, she managed to grab it before it slid away from her. It was a little awkward to throw while on her back, but she managed to hurl the crystal at the back wall of the room. The force of her throw propelled her backwards slightly, but it was enough to start making more notable progress.

She tipped her head back as far as she could, staring upside-down at the rest of the room as she slid across the floor. She could see the door that Melody had mentioned, but it was quite far away. She was going to need more crystals.

Melody, meanwhile, was having a harder time due to being on her front. Following her sister's advice, she spread out her legs and relaxed to let a crystal out, the smooth stone sliding from her tailhole as her muscles pushed it out. But it fell onto the floor out of reach, and her attempts to stop it only resulted in her knocking it away with her legs. With a sigh, she went still and this time reached back to hold a hand by her ass, relaxing and pushing another crystal out of her butt, into her waiting grasp. That was half the battle – now she had to find some way to throw it.

Stretching both arms out in front of her, Melody held the crystal with her palms up, and then hurled it backwards as hard as she could by lifting her arms over her head. It managed to propel her forward a bit, and she kept sliding on the frictionless floor, albeit slowly.

Rhapsody was working on another crystal as she stared up at the ceiling, noting that she was still slowing down – even if the floor provided no resistance, the drag of the air was still present. On top of that, since the two of them had both pooped just before coming down here, it was hard to get many crystals out. Two more crystal throws and she was having to work hard to push them out, flexing and clenching her anal muscles. She was sliding at a fairly decent pace, but she could feel one more inside her rump, she just needed to-

With another push, instead of a crystal, a long and loud blast of air escaped from her rear hole. She clenched up to stop it, but noticed that the force of it had propelled her along just a little bit more – so, after taking a breath, she squeezed and clenched again. This time, she let out an even longer fart that eventually trailed off to a high-pitched whine before stopping, giving an extra little boost to her speed. Letting out the breath she had been holding, she took a moment to recover before she suddenly felt her shoulders slide onto smooth stone, causing her to rapidly slide to a stop.

Getting to her feet, she saw Melody sliding towards her on her front, the younger rabbit's purple hair having partly fallen over her face. She, too, was trying to get one more crystal, and instead was only producing a rippling blast of air from her ass, but it still got the job done. Bending over, Rhapsody reached out to grab Melody's hand once she got close, and pulled her to her feet.

"Thanks." Melody muttered quickly as she brushed her hair back into place with one hand. Looking past Rhapsody, she peered through the open door behind her sister, and gasped. "Hey, I see something in there! Let's check it out!"

Melody ran ahead into the room, but fortunately, there were no more traps waiting to catch her. Instead, the tiny room contained only one last thing: a little wooden treasure chest about a foot in each dimension, packed to the brim with glittering gemstones; rubies, emeralds, amethysts, and others beside, a fortune in precious stones.

Rhapsody leaned in to inspect them. "Is this our reward?" she wondered aloud.

"I wonder, who pooped all these out?" Melody remarked, making Rhapsody snort in amusement.

"I think these were made the old-fashioned way. Or through magic." Rhapsody replied. Reaching out, she closed the lid on the chest, and then picked it up by the handles on the sides.

As soon as she did, both of them felt their bodies being pulled upward, and an immense dizziness overcame them both...

--------------------

Melody groaned, feeling cold concrete underneath her. Opening her eyes, she looked up, her eyes focusing after a moment as the blurry scenery turned into the ceiling of the basement they had found the mirror in. She slowly sat up, a little dizzy, and looked around.

Rhapsody was lying nearby, and starting to stir as well, still clutching the treasure chest between her hands. Looking into the mirror, Melody saw her own reflection, perfectly normally this time, looking back at her and mimicking her movements as well as showing the objects behind her.

"Rhapsody, wake up!" Melody said as she shook her sister, grabbing her wrist and helping her sister up.

Blinking, the older rabbit shook her head, her long ears flopping against the sides of her head. "Where...?" she began, but as she looked around, her own question's answer was obvious. Realizing she still had the chest, Rhapsody carefully opened it back up, and gasped as she saw it was still full of gems.

"Oh, wow!" she exclaimed, picking up a ruby and holding it close to her eyes to inspect it more closely. "This is worth a fortune! Melody, we're going to be rich!"

But Melody wasn't listening. "Uhh, Rhapsody...?" she groaned, as she put her hands around her waist, feeling an intense cramp in her gut and an equally sudden need to relieve herself...
