Katie, a six-year-old fox cub, sneaked silently into the bedroom of her baby brother Randy. An hour ago he had woken her up again with his stupid crying, and while Mom was busy feeding him or changing his diaper or whatever she had come up with a plan to shut him up for good.

She would wait for Mom to go back to sleep, then sneak into Randy's room, and eat him. She had read a book in the library that said that when food is eaten it dissolves in the tummy like sugar in a glass of lemonade until it was gone. With any luck there wouldn't be anything left of her annoying brother in the morning.

She stood next to his crib, it was high, but she could use the chair Mom used while feeding Randy to climb in and do the deed. She would have thought it ironic if she knew what that meant. She lowered herself over the side of the crib and crouched next to the kit, he was sleeping peacefully now, his fuzzy brown face poking adorably out from underneath the covers. Katie almost reconsidered, but then she remembered how he had woken her up minutes earlier. She threw back the blanket, he was naked except for a diaper, hopefully a fresh one, and barely stirred as he was exposed.

More carefully, Katie undid the straps on Randy's diaper and removed it. She was much relieved to find that it was still clean, but still she wasn't interested in finding out what it tasted like. This was it now, the last barrier to her fraternal meal was removed, but did she really have it in her to devour her baby brother?

Then Randy started to let out a little "peep", panicking that he might start crying again and wake their parents back up she clamped her hands over his snout to silence him. She couldn't let him draw their attention, she'd have to explain what she was doing in his crib and why he was completely naked. It was now or never. She opened her mouth wide and drew his head towards it.

She hadn't been entirely sure before if her muzzle could stretch enough to fit his head in, and it did take her some effort, but she managed it, her throat bulging with the outline of his snout. Once the head was past her collarbone the rest of his tiny body fell in with little work. She leaned back as she slurped up his white-tipped tail and looked down at her work. Her tummy had swollen with her sibling's mass, her body looked less like a fox kit and more like an orange-and-white beach ball with limbs and a tail. Her pajama top had curled up over the bulge, exposing her furry tummy, and her waistband was stretched so far that it seemed like it would fall off if she tried to stand up. But still, she had to leave before Mom came to check on Randy in the morning.

Katie struggled to get to her feet and heave her bulk out of the crib, but her brother's weight was too much for her six-year-old body to lift, especially when he started squirming. She had no choice but to lie down in the crib, her bloated belly shifting and rolling on top of her. As she threw his blanket over her she hoped that he would stop moving soon, and that by morning he would be small enough for her to escape his crib.
---
The fox girl was awoken by the creak of the door opening and a glimmer of light entering the room through the crack. Mom was coming! Maybe she could go and hide now, she thought in desperation as she looked back down at her tummy.

But no! It was the same beach-ball size it had been before she went to sleep. It had been hours since she'd eaten Randy, she was sure of it. Why was he still there?

She was still trying to puzzle it out when her mother came into view. "Katherine?" She asked in mild surprise, "what are you..." then she stopped, her eyes darting between her daughter's guilty expression and the bulge underneath the blanket. Her expression shifting between fear and anger at what she suspected she tore away the covering, revealing Katie's swollen belly.

Quickly, the adult vixen grabbed the latches holding up the side of the crib and unfastened them both, letting it fall to he ground. Then before little Katie could try to make a break for it she grabbed the vixen kit with both hands on either side of her tummy and pressed her ear against the round bulge. As mother kneaded daughter's tummy she listened for a heart she desperately wished still beat in there. Her wish was granted when a little fist beat against her cheek through the furry skin.

"Oh thank the Makers those anti-digestive mods were hereditary." She straightened up and picked her children up, carrying the un-ingested one under her legs and shoulders.

Confused, Katie looked up at her mother and started to form an explanation. "Mom, please, I didn't mean to,"

"Shush you." Mom cut her off suddenly. "Richard, come in here and see what your children have done now!" She yelled out towards her husband.

Katie shuddered as her brother started a whole new session of kicking and squirming inside her. She was in so much trouble.
---
Katie's mother plopped her down on the kitchen table in front of her father, who snorted his coffee in surprise at the sight of her gigantic belly. "Is that...?" He asked as he wiped his muzzle off, his eyes fixed on her squirming tummy.

"Apparently, your daughter thought her brother would make a nice midnight snack." Mom answered as she stood there glowering. "How far along do you think he is?"

After setting down his mug Dad started feeling around her belly. When his hands crept close to her pajama bottoms Katie protested, "Teacher said that you shouldn't let people touch you down there." She exclaimed.

Her father paused in his probing of her body and looked her in the face for the first time that morning. "I am not trying to molest you." He said with a tone of aggravation. "I'm trying to figure out how to get Randy out of your guts."

Katie had heard her teachers warn about "molesting" and she'd heard the word "guts" before, but wasn't sure what those words meant. She could assume that "guts" was another name for the tummy. But she hoped that her dad wasn't molesting her as he poked underneath her round belly and touched the region between her legs.

Finally, he withdrew his hands and sighed. "It feels like he's still in her stomach." He informed his wife. "I'd have thought he would have passed into her intestines by now. How long ago did you eat him anyways?" He said, turning back to his daughter.

"Right after the last time he woke me up crying." Katie replied angrily. "I just wanted to shut him up for good."

"And just what made you think you could get away with it?" Her mother yelled at her in response.

The little vixen withered under her parents' anger, she began to cry. "I thought he would be gone by now."

"If you could digest him." Mom paused to think. "If you could digest him there would be a skeleton surrounded by mushy meat in your belly now. And the rest of him would either be stuffing your intestines to bursting until you went to the bathroom, or making you fat. And you would be in much bigger trouble than you are now."

"Eww." Katie grimaced at the thought of her brother turning into a creepy skeleton and poop, at least she assumed that was what her Mom meant. "But, I can't digest him, right? What happens now?"

"Well," said her Dad, "thanks to the anti-acid sebaceous glands and oxygen-recycling nanites me and your mother got, and which you shouldn't tell anyone about." A flash of concern crossed both her parents' faces. "Randy should be just fine while he's inside you. But, by now your body should be forcing him through your intestines and out the er, back door."

It took the young fox a minute to decipher what her Father meant by that. "You mean I should be pooping him out?!" She exclaimed. "Gross!"

"You should at least be on your way to." Dad replied. "But he's still in the first part of your digestive tract. I'm guessing you're still too small to pass something as big as him, so he's stuck there."

"How long will he be stuck?" Katie asked, worried now.

Her father considered. "Well, I'd say until you grow big enough to pass him. But he'll be growing too in there, it may be years, even decades before he comes out."

"And until then he''ll be eating and drinking some of what you drink." Mom threw in. "You'll have to eat for two, just like I did when I was pregnant. Not to mention that he'll still have to pee and poop in there so you'll have to..."

Before her mother could say anything else the mental image of the little fox boy pooping all over the inside of her tummy caused Katie's stomach to heave violently. She bent over the side of the table retching until finally a flood of sour-tasting fluid and the damp but intact body of her baby brother came spewing out onto the floor. Mom grabbed a full roll of paper towels and quickly started dabbing her son off as he lay there crying and flailing around in a pool of digestive juices.

"Or, you could throw him up I suppose." Dad commented, jumping out of the way. "Anyways, Little Katherine, I think I know the perfect punishment for you now."

Katie sat on the table breathing heavily, grasping her now normal-sized belly and wiping the sticky nasty stuff off her face with her sleeve. "What do you mean Daddy?" She asked, hoping she wouldn't be grounded for too long this time.

"It occurs to me that you remain somewhat ignorant of the digestive system for a member of this family." He said as he grabbed the neck of Katie's pajama top. "And I haven't had a chance to finish breakfast today."

---
Katie screamed as her feet slid into the slimy tunnel of her father's throat, she tried to kick out but her legs were already trapped and could not move inside of him.  She flailed her arms in protest but he ignored her as he dropped her little body into his expansive gullet.  Within seconds her head had passed between his teeth and her feet were deep in the pool of his belly.  The hot fluid soaked her pajamas and rode up her legs even as she was forced to crouch inside of him.  As her head slipped from his throat into his stomach a ring of muscle closed it off, trapping her inside.
"Ahem", she heard her father clear his throat, the sound reverberating all around her.  "If you don't mind, daughter, I will begin this lesson by finishing my breakfast."  Through the walls of flesh she heard him pick up a fork and scrape some eggs off a plate, then, from up above she heard him chew and swallow.  The muscle ring opened briefly to spill some chewed egg mush onto her head, gross.  The scrambled eggs were followed by a couple pieces of toast, one chewed and one whole, and an entire peeled banana.  Feeling a little hungry herself, Katie picked up the whole piece of toast before it got too soggy and started eating it, then decided against it when she tasted the sourness of the belly's liquid on it.  It reminded her of throwing up earlier.  She managed to catch the banana before it fell to the bottom and ate that, figuring she wasn't getting anything else to eat this morning.  Her father's booming voice started again.  "After chewing and swallowing food is churned up by the stomach's muscular action."  As if on cue, the walls of his stomach closed in around her and squeezed her.  Then they loosened slightly, before squeezing again.  The sour fluid and mushy food splashed over her chest and shoulders.  "In addition, the stomach produces powerful acids that break down the molecular structure of the food so that it breaks apart."  It seemed that the fluid levels rose in his stomach, even accounting for the narrowing space inside.  "Fortunately, me and your mother had some slightly illegal gene therapy treatments so that our skin produces a solution that neutralizes stomach acids.  And we passed that gene on to you and your brother.  So you will survive your tour of my digestive tract, just like Randy survived his tour of yours."  The stomach walls threw up another wave of acid at Katie, coming directly at her face.  She moved to avoid it and her pajama shirt tore, falling away from her soaked fur.  "What was that?"
"My pajamas are ruined!"  The little fox girl exclaimed.  "They're soaked, and ripped."
"Oh, the anti-acids don't affect your clothes, sorry."  Her father replied.  "They will be digested.  Guess I'll be getting a lot of fiber today."
---
Soon the acid had dissolved all of Katie's clothes and she was left sitting naked in a pile of mush.  Time passed, and slowly the stomach began to push the ooze down somewhere, she couldn't see the hole under all the digested food and pajamas but the liquid formed a small divot somewhere in front of her when the stomach walls contracted.  "Dad?"  She asked, more calmly and softly this time, "it's all going out through some kind of hole."
"That means my breakfast has softened enough for my intestines."  His voice came from all around once again.  "If you look closely enough you might see the sphincter."  She assumed he meant the hole and she leaned in to try and look at where it should be.  As the level of digested breakfast and acid lowered she was able to spot a hole in the fluid opening and closing with each contraction.  When it was down to almost a trickle she leaned her head an inch above where the hole should appear, and as it opened again the stomach wall pushed her in face first.
"Hmmgh!"  She groaned, not daring to open her mouth and let the horrid fluids in.  "It grabbed you, didn't it?"  Katie tried to nod in the confining tunnel, guessing her dad might be able to feel it.  "Now you get to see the intestines work first hand, isn't that exciting?"  The stomach walls pushed her in an inch at a time as she slid through the muscular ring that was so similar to the one at the opposite end of the stomach.  The fluid inside the "intestine" as her father called it felt more like clear water, that was refreshing at least, aside from the occasional bit of mush or something more solid floating in it.  The walls on the other hand, aside from the narrowness, felt like a carpet of little feeling fingers or tentacles.
Before she could try to ask what those little feelers were her dad supplied the answer.  "As digested food passes through the small intestine small folds called "villi" absorb what nutrients and sugars they can extract from the food and pass them into the bloodstream."  Katie's eyes widened, even though it was now so dark that she could barely see a thing.  Would she be absorbed into her dad's blood?  "Of course, you have to be really small to fit into one's blood."  She should have realized that, it was pretty obvious really.  "So anything that the stomach and intestines can't break down that small has to go all the way through to the end."
As he said that, another contraction pushed Katie's small body even further into the intestine.  She wondered how long it would take to pass through these intestines.  She made another airless moan to try and get her dad's attention, hoping he would get the intention.
"Well," he said.  "The small intestine is about seven meters long in adults, would be a bit shorter in a kid like you but it seems you can't even pass a baby yet for some reason."
Seven meters?  That was more than three times as long as dad was tall, maybe four times.  How could all that fit in him?  As the intestine moved her another inch along she wondered if maybe she should try taking a nap or something.  He would probably wake her up the next time she came to something interesting anyways, she thought as she let herself drift off to sleep.
---
Katie was awoken sometime later by something poking her sharply in the side.  She started in surprise, attempting to wriggle free of the thing that was confining her before remembering that she was inside her father.  The pokey thing withdrew and she heard her dad ask "were you asleep in there?"
Thinking she would be in trouble Katie shook her head quickly.  She couldn't tell what he thought she had done because his next statement was: "it's been hours since you moved last.  I was starting to get worried that you had drowned or something.  Good thing those cheap nanites your mom got passed the placental barrier to you and Randy."
Drowned?  Katie realized then that she had spent the past couple hours underwater and had managed to hold her breath the entire time.  Shouldn't she have died by now or something?  Her dad had said something about nanites, what could those be?  Could they be the "nanomachines" that had come up in history class a few times?  But nanomachines were illegal, alien technology that could not be given to mere primitives like themselves.  How would her mom get them?
"Anyways," her dad continued.  "I believe you're coming up on the large intestine.  It's a lot wider and there's some air in there so you can breathe, but I rather doubt you would want to."
The little fox girl didn't know why her dad would think that and didn't care, she squirmed and wiggled to try and get to the large intestine faster, eventually banging her head against the next sphincter.  As she pressed against it the ring of muscle opened, she slid through to her neck, then opened her mouth and took a deep breath...
And almost immediately choked on the smell.  Gasping and gagging as intestinal fluid spilled out of her mouth and nose to be replaced by a foul stench like the worst public restroom made ten times worse.  She struggled to pull an arm up through the sphincter so she could hold her nostrils closed but it was too tight.  As she struggled she remembered something her mom said about her brother staying inside her until she went to the bathroom, and there was the smell in here and as she started to piece it together a rumbling sound rushed smelly air away from her and deeper into the intestine, followed by a loud blast from what she presumed was the end.
"I'm up your butt!"  She screamed, forcing another lungful of intestinal gas up her nose as she finished.
"Oh, you figured that out on your own, did you?"  Her dad laughed.  "Yeah, the large intestine's job is to suck the water out of whatever the small intestine couldn't absorb, clump it together, and poop it out."  As the young vixen was pushed into the larger intestine she felt something damp, squishy and smelly against the side of her face, she drew back in horror as she realized what it was.  "Hey, careful in there.  You don't want to give your old man a hernia do you?"  She didn't know what that was, but she had to intention of going in there with the poop.  Katie grabbed onto the sides of the small intestine and hung there, half in and half out, as the intestines contracted and pushed the congealing poop further away from her.
---
After a bit longer she felt something loosen as her father took his pants off and sat down on what she guessed was the toilet.  He groaned, there was a brief suction that tried to pull her forward, followed by a rush of slightly less unpleasant air and the sound of a loud flush.  Katie felt him slap his belly lightly and heard him say.  "All right now, the poop is out.  You can let go now."
Reluctantly, the fox girl loosened her grip and let the intestines push her along.  It was still a little sticky and smelly along the sides of the large intestine, but she endured it as she knew it would finally mean the end of this horrible experience.  Finally, she saw a light at the end of the tunnel, followed by the pool of a toilet bowl mercifully filled with nothing but water.  Once her head popped out the rest of her body followed in quick succession, causing her to drop onto her head in the water.
Her dad stood up slowly, Katie's legs and tail popping out of his tailhole as he straightened, and picked her up gently.  "You need a shower."  He told her as he drew her over to the bath and turned on the hot water.
After running scalding hot water from the detachable shower head over her fur at close range several times and scrubbing her vigorously with shampoo her dad was convinced that she was clean enough.  Draping a towel over her he asked "and what have we learned from this experience?"
Katie said the first thing that came to mind.  "Food turns into poop."
Her father stared down at her disapprovingly.  "And what else?"
The soaked little vixen considered what she had done before her father ate her.  "...and my little brother is not food."  She concluded.
"Good," came the voice of her mother from the bathroom door.  "Because, if you had managed to make Randy into poop, I would have done the same to you and made a couple of new kits."  The older vixen strode in, wearing a loose blouse and yoga pants that barely covered her now expansive belly.
Katie stared at her mom's tummy, wondering what could be in there now.  "Did you eat someone too mommy?"  She asked, feeling a tad worried now.
"Oh, this?"  Her mother laid a hand on her belly, lifting it gently.  "No, not today.  Though I suppose some might consider it a way to eat someone, I think it more of a case of "going home" in this particular instance."  She stroked the bulge with an almost loving touch.  "Funny thing, after I was done feeding Randy this morning he tried to burrow into my stomach or something.  Then I set him down on my lap and he climbed between my legs and up my vagina.  Then he curled up inside me and went to sleep."
"You hear that little Katherine?"  Her dad said.  "You turned your baby brother into a vorarephile already."
Katie was confused again by all the big words being thrown around.  "What's a "fa-gi-na"?"  She asked first.
Her mom looked ascanse at her.  "Didn't I tell you?"  She said incredulously.  "It's the slit between your legs and in front of your butthole."
Katie was still confused.  There was no way the little holes in that thing were big enough to fit an entire baby through, even on a grown-up vixen like mom.  "What's up in there?"  She asked instead.
Her mom, Katherine the older or "Kathy" to her friends sighed and looked to her husband and regular pred or prey Richard.  "I guess we'll need to teach her where babies come from next."
As her dad nodded Katie felt something pressing in her lower belly.  "Can I at least go to the bathroom first before you stick me in one of your bodies again?"