"Dad, come on; it's Christmas Eve!  Why can't I play video games?"
"You're on punishment, remember?  No games until your grades improve!"
"I got two B's and an A in History!  Do you remember when YOU took History in high school, Dad? SNORESVILLE!"
"And you got a D in Geometry."
"So? The teacher was crap!  She was a substitute for two weeks and tanked my grade --!"
"I'm not fighting over this anymore.  No games.  That's final."

Johnny grumpily huffed and crossed his arms, storming out of the living room.  Snow piled up outside; it was chilly on the inside, but the furnace had been off for a while.  David sat and pondered why his child had turned out so... imperfect.  He was his first, and he hated having to punish him solo.  This was the first Christmas that he was without work - he'd been fired from his most recent job, but fortunately he landed a new one just before the season started up; so he was able to negotiate the holidays to his family.  His wife, Adrien; was out of town on business, however.  She was the Chief Financial Officer of the Jelatin Corporation, and they were striking a big cryogenics deal with some bigwigs over in London.  The trip was going to traverse the holiday, though; so she'd be out of the picture for now.  David sat with a cup of hot chocolate close to eight in the evening; turning on the news and listening to all the holiday cheer going on in the city.  Johnny returned and took a peek at the Christmas tree in the corner of the living room in their house - there were about twenty presents strewn about, but none were addressed from Santa yet!

"I know Santa's not real, Dad; but do you think he'll make it 'around the world' in time?"
"Who told you Santa's not real?"
"The kids at school said it the whole week leading up to now."
"Johnny, Santa IS real.  Trust me; I'm forty years old and I STILL get presents from him - naughty and nice still apply, big guy."
"If you say so; Dad.  I really think he's got me on his 'nice' list this year; don't 'ya think?"
"I guess you were alright this year, huh.  At least from my count, anyway; Santa knows what you do and when you do it better than I do."

David dragged Johnny with his rust-colored hair on his Caucasian head into a noogie, and they both had a laugh from it.  The two of them broke out a board game they both loved to play and went at it until around ten at night, and David hushed his kid and sent him off to bed.  He did the same as well, delivering the usual pre-Santa 'good nights' and whatnot.  He called his wife, wished her well, and then went to bed.  The furnace clicked on, as did the chimney that lead outside from the unlit fireplace.

True to his word, Santa came on time, albeit in the distorted time-warping reality that he had to maintain in order to get completely around the world in a single night!  He huffed and took a peek at the address:

"692... West Martin Street.  Yep, this is it, right here..."

Santa rummaged around his big red sack of presents and pulled out around twenty more packages (small ones, big ones, and a number of questionably-looking ones as well), setting them into a separate backpack-like device that he slung over his shoulder.  The big, red man pushed a button on his suit, and suddenly he shrank to a miniscule size!  All four-hundred-thirty pounds of him parachuted down into the chimney, landing cleanly in the coals at the bottom.  He stepped out into the living room; quieter than a mouse, and activated another suit-tech that resized him back up to normal.  He shook off a little of the snow on him and took a peek at the lit tree; depositing the presents he had for David and his family at the foot of it behind the others.

"Nice and secure, just like always."

Santa turned towards the kitchen, spying a little dish with an oversized cookie on it along with a traditional glass of whole milk.  The dish had a sign that said 'For Santa - from Johnny' on it.  He couldn't resist a little treat, so Santa took a bite out of the cookie, clean and crisp.  It was gooey in the center and delicious all around - snickerdoodle flavor!  A little different, but tasty!  No sooner did Santa swallow than a loud fart rip out of his rear end as well as a host of shit - that boy had spiked that cookie something fierce!  Santa huffed and drank the rest of the milk as well - might as well quench your thirst before dragging the naughty boy and his family into something they wish he hadn't...

The big, jolly man waddled into the family's master bedroom, where David was sleeping soundly.  In his timespace, Santa decided that David and his son were going to have to learn the hard way not to play tricks on Santa - Halloween isn't his bag.  He pulled out a circular disc with a swirling blue and black pattern on it and gave the toy a little spin.  Inside David's mind, he lay dreaming about owning a new house, signing the lease and keeping his family close.  That all changed when a tornado of blue and black suddenly spiraled his house into the air, sending it crashing back down again on top of him!  David jolted up to find the stinky Santa crouched over his bed, farting up a storm and invading two (soon to be all) of his five senses!

"David... your son's been a *bbbllrrrrrt* bad boy this year.  VERY BAD."
"VERY... BAD...?"

David drooled as he looked up at the large, white man; feeling a numbness he hadn't felt in forever start to rise up within him.  Santa grinned and dug in his wet-snow-covered boots into the bedsheets around David while he struggled against Santa's mind control; smelling the gross stench of the fat man's shit in his nostrils.  He started to wet himself as he lost control of his nethers as well, the big man having prepared for such an occasion.  

David pulled up his toes into the air and let Santa pad him up so he wouldn't make a mess of the house - ironically, it was one of the same diapers he gave to his 'elves in training'!  Christmas decorations adorned the big, spreading padding, keeping David's night-time wee both flowing and contained.  Santa grunted as the laxative made him shit himself a little more; all the good cookies in the world were slowly getting repackaged under his 'sleigh'.  Santa picked David up and pulled him out of bed, over his shoulder, and walked down the hallway towards Johnny's room.

Johnny hadn't gone to bed yet - he was busy playing Monster Hunter on his 3DS.  Muffled beeps and boops of the game along with a curse word or five came from the young boy's mouth as the other two entered the room.  Johnny immediately ducked out from under the covers, slamming his 3DS closed and hiding it under his pillow.

"Dad; I swear, I was in bed -- SANTA!?"
"I'm honored that you wanna call me 'Dad', little Johnny."
Santa smiled, then held the spiraling disc up to Johnny's eyes, immediately turning him into Santa's newest 'elf'.
"No hard feelings?"
"No... Daddy..."
"Good... now lay down so you can get changed, too."

Johnny stuck his thumb in his mouth while David toyed with his little elf booties and jingly hat.  Santa's got tech for days, even if some of it's really low level.  He diapered and dressed Johnny up in the same green and red garb and brought the two of them into the living room for a bit more 'training'.  Santa squatted down as he set the two kids down on the floor in front of the tree.  He himself waddled into the kitchen, flicking the lights on while the TV turned on all by itself to the 24/7 NPP (North Pole Programming) channel.  Santa was going to bake some cookies of his own since Johnny couldn't seem to do them properly!  He preferred chocolate chip as it was, and seeing as how he had a few aeons to burn, he could give the two a couple more 'minutes'.

Santa rummaged through the cupboards until he found some easy-bake chocolate chip cookie mix, then grabbed a mixing bowl and hummed in between shit starting to leak out of his pants.  The big man sure knew how to pack away a good Thanksgiving meal before Christmas came around!  He poured the cookie mix into a muffin tray he found as he continued to poop his pants and get the 'cookies' set up with his own special brand of laxative.  Turns out, Santa's spiteful.  He sprinkled a little rainbow colored powder into the mix so it'd bake into the muffins as they rose up - a little treat for later!  He fired up the oven and set it to 400°, wanting the two kids in the other room to have a nice Christmas treat to wake up to later.  Santa walked into the living room while the muffins began to bake and emit a sweet scent to offset the smell of poop in the house.  

Johnny and David had already succumbed to the mind-controlling spinny disc and the blare of "How the Grinch Stole Christmas" on the TV, but in a way most devious and strange... David's kid had mounted his chest and made his red and green diaper a little darker in the front, pissing up a storm!  David leaned up to smooch his son's face, and Johnny leaned in to do the same, digging his tongue against his father's facecheeks.  Santa's magical-tech had totally converted the two to a completely new sexual status - one they'd probably never remember once Santa was gone!  The man moaned up into his son's mouth while Santa cleared his throat at the two of them in their cute little elven outfits, immediately calling them to attention.  Santa opened his coat once more and pulled out from one of the inner pockets an extra-extra-extra-large diaper for himself - Johnny had to change the big man all by himself while David giggle-fitted himself into pissing his pants!  He just thought it was hilarious that the smallest elf had to do the biggest, stinkiest job, but Johnny didn't mind it much... Santa's load was a lot more appealing than his presents were, and his little hat jingled while Santa farted in his face while he started to pad up the big, gay man.  Johnny's tongue slurped back and forth, cleaning off Santa's 'beard' between his massive asscheeks; and Santa didn't make it easy for the little guy either as another loaf came out amidst Johnny's teasing at his butthole.  To him; he thought he was eating chocolate chip cookie dough straight from the cookie mines at the North Pole, but in reality it was much worse.  David snickered at Johnny, but Santa waggled a finger at him - he'd have to eat some 'cookie dough' as well, and pointed to the soiled set of pants with about a hundred-fifty pounds of poop mushing outwards inside the rip of the soiled, fuzzy and red trousers!

Johnny reached around Santa's rump and taped the white and red-nose-printed diaper around his tush securely, then wiped some of the poop off on his arm, licking it up afterward.  Santa rolled upward again  and checked his rear end; rubbing between his buttcheeks and finding no waste to show for it!  (The smell still clung to his rear end, though.)  Johnny had put on a bit of weight from eating Santa's 'fudge', and David was doing the same while he took big mouthfuls of the stuff!  Santa stood up and crinkled rather loudly as he went to sit in the family's armchair, but no sooner did his butt crinkle once more did the oven's timer go off - the muffin-cookies were done!  He got up and left the poop-munching elves to do their thing while he removed the muffin-cookies from their steamy, metal embrace and set them on a cooling tray to cool off.  Santa took off the oven mitts he used to do it with and closed the oven, turning it off and presenting warm chocolate chips to the dad in his pants and the kid licking his lips!

"Ah ah ah... you two know the drill."

Santa carried the tray over to a serving tray that David used when he watched his TV shows after work, sitting it to the left of the armchair while he plopped another loaf in his pants; making a big stink of the already excruciatingly smelly home.  Johnny dingled his way over into Santa's lap, holding his now pot-bellied tummy as the shit in it swirled, bubbled and made his belly bloat!  He belched once while he sat on Santa's leg, curling up and rubbing at the big white bear's man-tits.

"And what would little Johnny like for Christmas this year?"
"A Wii U!  Splatoon... umm..."
"Johnny...?"
"Coal.  I've been a bad boy... and a muffin..."
"There's my little guy."

Santa pulled one of the muffins off of the serving tray and let Johnny nibble at it.  The flavor was deliciously sweet, and the powder that Santa had put in it prior to Johnny eating it didn't help matters.  It all expanded and made Johnny's guts get extremely heavy, and he made a face while a squeaky toot came out of his virgin bumhole!  Santa helped him off of his lap and told him to watch his cartoon while he beckoned his father over - a rather comical sight to see a grown man asking Santa what he wanted for Christmas!

"And what do you want for Christmas, little David?"
"Coal... a muffin... and a snowmobile!"
"Ho ho ho... I'll see what I can do about that last one.  For now..."

Santa handed David another muffin and chuckled to himself while the large adult soiled his pants a lot faster than Johnny soiled his!  His muffin magic sure did a number on their bellies; making a whole host of filth grow throughout their digestive tracts.  It was gonna take a long while to empty them out completely; let alone the fact that their heterosexual inhibitions had been thrown out of the window.  The two little elves burped and farted occasionally while the cartoon went on in the background, but Santa didn't mind; it was all in good fun!  Save for the fact that Johnny was trying to mount his dad during the commercial break, that is.

David rolled over to Santa's feet while the jolly bear chuckled at his position under them.  He got comfortable as the laxative Johnny had fed him started to wane in strength; only getting a few poots out of the old guy while he watched the male beneath him waggle his wet, squishy diaper about.  Johnny bucked his already bulging waist against his dad's butt, pulling the fat, soggy thing down enough to expose his soggy white tush.  With a slip of his dick, Santa watched as Johnny mounted his father's clogged behind and made a smelly mess of his own at the same time.  Drool flew from his mouth as the experienced teen made short work of his father's butthole; pistoning in and out of his elven tush.  Santa had a muffin himself as the sludge in David's gut continued to grow and bulge, fattening to the point where his gut hit the floor, and Johnny - the naughty elf that he was; started to piss inside his dad's butt!  His eyes spiraled out of control as his quickly-building orgasm was only matched by the amount of shit that was coiling out of his derriere into the depths of his holiday-themed padding.  Santa chuckled to himself again while he finished up his muffin and leaned off of his footstool; watching Johnny cum a load to make even the sluttiest porn star jealous!  The boy grunted and finished off his dad; who then proceeded to waste the entire load into his diaper; farting considerably harder than he was usually used to!  

Santa let the two mush in their stinky elven outfits for a while longer before he looked at the time - just shy of eleven at night!  He needed to get going; more naughty children (and adults) to punish and set straight.  He clapped his hands together, utilizing a little Christmas magic to get his suit nice and clean again before getting dressed to go back into the chilly nighttime sky.  David and Johnny would be fine; they'd just have to get over those muffins and need a couple spare trash bags to take care of their little bowel troubles.  Besides, those muffins were good; they'd probably last throughout the holiday anyway!  Santa crinkled a little bit in his semi-fresh padding as he wished his little elven boys well and pushed one of his suit buttons; packing up his little spinny dial and turning the TV back off again.  The button triggered a minute-long delay for his time-warping field to dissipate; more than enough time to wish the two stinky elves a Merry Christmas and tuck them into bed.  He even went so far as to write little notes on a set of muffins, sticking them on plates that said 'From Santa, to Johnny/David'.  A little reversal of fortune never hurt anybody!  Santa nodded to the two and closed each of their doors quietly and packed up his other belongings, headed to the chimney.  His suit shrank him again, and the big man dove into the fire, catching an updraft as the fire licked at his boots!  (The man was prepared for a nasty evening of elven servitude; what's impossible for Santa, you say?)  He popped out of the chimney and brushed off a bit of soot on his suit, resizing for the last time (at this house) and hopping back into his sleigh for a time-splitting night of deliveries.  Johnny smiled in his sleep as he heard the bellowing 'Ho ho ho; Merry Christmas!' as Santa took off into the deep, purple night time sky.