It was bright and early when Gohan's alarm clock went off, and for a change the normally hard to wake up sleepyhead sat up in bed, grinning like a fool. 
It was Gohan's birthday after all and what that meant was that his mom would be getting her and Goten ready to go into town for part of the day to give The young half sayian some privacy. 
For it was a reoccurring birthday tradition that Goku would use his 24 hours of time on earth that he got every year to come back on Gohan's birthday, and spend the evening and night with chi chi but the day was all about babying Gohan, who might of been turning 17 today but he was more like a 2 year old in so many ways.

The big baby fetish had popped up while training with his father in the time chamber, Gohan had noticed there was a stack of diapers in the room and had started 'having accidents' to get his dad to diaper him before bed.
Goku might not of been the sharpest knife in the drawer, but he hadn't been fooled and had taken to babying the little guy more and more. 
Chi-chi had been less eager to indulge on her son's babyish habits, though with her being pregnant at the time she found out about them, one could hardly blame her for not wanting TWO smelly butts to change. 
She did go alone with the bed wetting cover story so Gohan could wear to bed, though she made him wash and dry his own diapers and made it clear she didn't want him stinking the house up, and he was NOT to tell Goten about the diaper fetish or explain out big babies to him, she'd had a hard enough time getting her youngest potty trained as was.
while Gohan took the deal it was clear that it wasn't the same without someone babying him, and when Daddy had made his trip to earth from the afterlife (Something he had done on his and chi-chi's anitverity back then) Gohan had floated the idea of maybe kinda sorta getting like, 5 of dad's 24 hours to just be his stinky little guy.
Goku thought it was cute and after a lot of back and forth they got Chi-chi on board.

Gohan waddled out in his bed time shirt and wet cloth diapers, the formerly white cloth had been pee stained by the heavy usage and by this point Gohan wasn't even sure he HAD nighttime control anymore.
Goten was eating a bowl of cheerios and giggled a little as Gohan wandered in, The smaller half sayian thought it was just so funny his big brother was a bed wetter.
"Hey short stuff, where's mom?" Gohan asked, ruffling his little brother hair on his way to the fridge.
"She's packing the car crinkles." Goten said, making a face as he haired having his hair messed up. 
"I see~ So you and trunks going to just cause trouble and chaos today?" Gohan asked, grabbing the milk out and since the bottle was almost empty he just drank right from it.
"Of course not, we'll be total good boys." Goten said with a evil little grin on his face. 
"mmmmhmmm.. right. Just remember Vegeta's not out training in space anymore. he got back yesterday, and can and WILL spank your butts." Gohan warned. 
"Ah Poopies! There went THAT plan." Goten grumbled as Gohan chuckled and took a seat.  "..heh.. surprised you just don't put a nipple on that bottle. You look like a big baby anyways." Goten teased.
"A big baby who can kick your butt with ease little guy." Gohan teased back. "I'll go super sayain two and make you change my diaper."
"Ehehehehe shutting up." Goten replied fast and meekly, and focused on his cereal.
"Good boy."

After some more playful banter, and getting sang happy birthday by mom and Goten, Gohan saw them off, standing in the front yard in just his diapers and t-shirt.
Chi chi tried to get him to go and get dressed but Gohan (for the sake of goten) said he was likely gonna go back to sleep, and pointed out only the dinosaurs were around really.
"And they know better then to get on my bad side." 
truthfully Gohan just wanted to keep his wet diapies on so daddy could change him and well, because as soon as mom and Goten were far enough away Gohan was gonna unleash his morning glory in his huggies.
Chi-chi seemed to know what he was thinking though, as before they got in the car to drive off, she looked back at Gohan and mouthed silently to him.
'Not in the house!'
'Maybe I'm getting to be too predictable.' Gohan thought, rubbing the back of his head as they drove off, then had a impish thought. 
"I'm gonna go dookie in her room on her pillow!" he giggled out loud.
"You know, bad boys don't get spoiled by daddy." came a voice behind Gohan.
Turning around, there was Goku, smirking and then holding out his arms.
"C'mere birthday boy." 
"DADDY!"

It was bare luck that Goku had managed to get cleared when he did, and was able to come back down in time to keep Gohan from being a little rascal. the boy was due for some birthday spankings but that didn't mean Goku wanted to have to do a time out and punishment.
Setting the over sized baby on his hip, with a arm under Gohan's fat diapered butt, Goku smirked as Gohan started to babble on and on about what Goku had missed.
"And so like this Videl girl at school is trying ta start a rumor I wear diapers, cuz I smelled like pee and baby powder one day and she's just a fart head!" Gohan was finishing up as Goku brought the big baby inside.
"well you know Gohan, you kinda DO wear diapers." Goku pointed out and chuckled.
"Well..Uh..Not to school I don't!" Gohan huffed and crossed his arms.
"mmmmhmmm..and how much of that is because you know your mother would tan your butt?" Goku asked.
"Er..well.." and Gohan looked super sheepish. "Heyyy so do you wanna see the rocking horse I've been working on?" Gohan said, trying not so subtly to change the topic.
"Of course! You know I love seeing what you work o-" Goku was saying when a loud and long tummy growl came from Gohan's tummy.  "-N..Heh. I think I better get you fed first though." Goku teased.
"Ehehehe yeahhh Might be a good idea." Gohan agreed.

Gohan was in the pantry, working the floor board to get his hidden stash of baby food as Goku went out to a small shed and brought in his 17 going on 2 son's highchair. 
it was made of Oak and had been painted bright white, though it's time in the shed was taking it's toll on it and the paint had chipped and flaked and dulled.
the tray was a flip around that could be used to pin Gohan's arms, at least appearance wise. the boy could after all basically bench press moons so it wasn't like a tray could REALLY stop him.
Carrying the chair in Goku smirked, Gohan was still trying to pick out what he wanted, and with his head and one shoulder in the little trap door, he was wigging his butt.
"I like to eat eat eat, Apples and bananas!" he was singing.
"Really? then how come you normally have prunes or brussel sprouts?" Goku asked, setting the chair down. 
Gohan turned around and giggled, and indeed was holding onto four jars, two of each.
"Cuz I only get daddy here to change my butt for a little while, and this helps me make BIG presents!" he said and gave a impish grin. 
"Yeah, and makes you toxic..Ah well, you're the birthday boy~" 
walking over he got the jars from Gohan first, setting them on the table then came back for the impending little stinker, lifting him up and setting him in the jar, then tugging off the boy's shirt.
Is your bib still in the drawer by the sink?" Goku asked. 
"Ehehehe no..uh..I hada hid it in my room for awhile, Goten was snooping for gifts when his birthday was coming up and welll.." Gohan said sheepishly., poking two fingers together. 
"I'll go get it, you stay put LITTLE guy." Goku said, and then kissed Gohan's forehead and tugged the tray down.
He was almost to the door when Gohan giggled and cleared his throat.
"Yeah little guy?" Goku asked, pausing.
"Don't you think it might help if i told you WHERE I hid it daddy?" Gohan asked with a amused smirk.
"..Sure. go ahead and use logic on your poor old man who's gonna have to smell you latter." Goku teased and blew a raspberry.
"Changing mah smelly butt is a privilege n a honor!" Gohan giggled, then added. "It's under my bed in a box marked Math work. Mom told Goten if he messed with any of my school stuff she'd make him start going. worked better then a androids force field for keeping him out." 
"and you all wonder why I do what she says..the woman knows how to handle us Sayain's. Anyways, be right back babykins."

Looking under the boys bed in the box as he'd been told to, there was Gohan's light blue bib, big enough to still work on him though Goku would have to ask Chi-chi about getting him a new one, it too was feeling the effects of years gone by. 
the words DIAPER BOY was spelled out in baby blocks on it and as Goku went to push the box back under, he noticed a few new things he hadn't seen last time. a large pacifier with a orange mouth guard, a baby blue rattle, and a stuffed teddy bear. 
"heh..Somebodies been treating himself.. bet his mother doesn't know about those." Goku said softly, tugging them out and putting them on Gohan's bed for now. 
He wasn't going to rat the boy out, just ask how he was getting these things and making sure he was being safe when buying, Chi-Chi was always so worried he'd be recognized. 
'Then again once it's in the open, he could wear all the time, that wouldn't be SO bad..' Goku thought, then pictured trying to pitch that idea to chi-chi..and shuddered.

Gohan was coo'ing and gurgling away in his highchair, ever so happy when he suddenly recalled that he'd recently picked up some more baby stuff last week. and he'd done it on his way home from school which was a biggggg nay nay with the rules Mom had put in place.
'Maybe he won't see them, or I can bluff and tell him they were a early present from mom...Yeah..then he'll bring it up with her and I'll be lucky if she doesn't start weening me off the diapers.' Gohan thought.
His dad came back in and smirked at Gohan, coming over and tying the bib on the big baby and then nonchalantly asked.
"Gohan, is there something you'd like to confess to daddy?"
"welll when you put it that way...No." Gohan said and gave a slightly nervous grin.
"Gohan.." Goku said, getting a warning tone in his voice.
"I well..Might of..maybe kinda sorta..re-purposed some of my lunch money saved up over a few days, to um.. You know. Stop at a baby store." Gohan said, eyes darting around and looking anywhere but at his dad.
"I see. I know what you got, who all saw you?" Goku asked, grabbing a spoon and taking a seat, opening a jar of the smelly baby food.
'No wonder this stuff makes him so toxic if it smells this bad before going in him!' Goku thought. spooning some up.
"J-Just the shop keeper daddy. I told him it was for my new baby brother." Gohan said quickly then opened his mouth wide.
"Well ok then. I just wanted to be sure. I'm not going to tell your mother about it Gohan, but I don't want you going out and getting this stuff yourself anymore. we'll make up a list later of things she can get you for your birthday, and you'll just have to do without any big boy presents." Goku said.
as the spoon went in the 17 year olds mouth, Gohan made a sour face but then smiled, clearly he was on board.

After feeding Gohan, which took slightly longer then one would expect because the little imp kept moving his mouth so he got baby food on his cheeks and chin and bib, Goku wiped the little guy clean and set him back on his hip while he made up a bottle of formula for the little guy. 
Gohan was coo'ing and babbling babyishly, clearly in his little space, with the only thing shush him from time to time beding a loud belch.
"heh, I was gonna burp you, but I think you've taken care of that yourself little guy." Goku said, though he wrinkled his nose at Gohan's baby food breath. 
"Nooo you can still burp me!" Gohan whined. "I'll be SO gassy after mah ba-ba!" 
"Heh, I know buddy. don't worry, you'll get burped JUST like the big baby you are." Goku promised, and was reward with a smooch to the cheek as he carried Gohan into the living room.
"hehehehe fank ku daddy! ou's da best!"
Goku turned on the television to a pre-school show then cradled the big baby in his lap, and popped the nipple of Gohan's ba-ba in the eager boys mouth.  keeping most of his attention on the cute big baby as he drank eagerly, Goku couldn't help but semi get drawn into the show itself, and made a mental note to ask Gohan for a update on what had been happening with it while he was in the other world. 
(go figure, the afterlife's cable providers were crap.)

Gohan was fighting hard to stay awake as he drained the ba-ba.. it just felt so right to be in his diapies and in daddies lap, and the formula tasted so nummy to him.
Still, he only had so long with daddy and he didn't wanna waste it with a long nap like he had two years ago. Mean old mommy hadn't even been willing to let him have 3 extra hours with daddy and he'd had to go from bottle feeding to waking up in the middle of a stinky diaper change, but instead of diapies it's been gross old undies.
After that he'd promised himself NEVER AGAIN!
He forced his eyes open and smirked around the nipple as he saw daddy trying to pay attention to the show, though this had the side effect of making some of his formula rub down his chin.
Goku instantly noticed though and using a towel he grabbed, he wiped Gohan's chin and pulled the bottle out with a pop as Gohan tried to keep it in.
"heh, I think that's enough for right now, If I keep feeding you your gonna conk out buddy." Goku said, and held up the bottle. 
it was a one liter deal and was a little under half drained.
"Gohan would of argued but knew daddy had a point, and plus with how greedy he'd been he could feel the gas bubbles building up. 
He could also feel a pressure building up at his back door, but decided to let THAT be a surprise for daddy.
"Dadddddy, My chest is all achy!" Gohan whined and pouted, though his eyes gave away the delight he was feeling.
"Oh Then I guess my big baby of a 17 teen year old son needs him's daddy to burp him huh?" Goku asked.
"YESH!.. I mean..if you want to." Gohan said, sitting up in daddies lap and then going all blushy and shy. 
"Heh. cute buddy."

With Gohan and him in a chair with no sides, Goku set a towel over his shoulder then got the big baby set up so his legs went over either side of Goku's.
Putting Gohan's head on the shoulder with the towel Goku had a hand on his son's diapered ass to help him keep balance but then started to rub and gently pat the big babies back.
"Come on buddy, let your gas attacks allll out. you'll feel better soon." Goku said, and patted the boy's bottom a few times as well.
Goku knew from experience that with the look in Gohan's eyes before he'd started to burp him, that he was gonna have a not so little stinker on his hands soon.
Picking up the pace with the patting it wasn't long till Gohan let out a belch that made a near by plant eater run in terror, the dino thought it was a T-rex roar.
"Whoa little guy! maybe daddy needs ear plugs for next time!" Goku teased, but kept patting. 
Gohan went to say something but a second and third belch followed, along with a little bit of spit up!
Normally Gohan hadn't been that babyish, and the spit cloth was really there just to set the mood.
again he went to go and comment on this to his dad but a loud poot came out from his behind. 
Goku stopped patting the boys back and placed that hand on Gohan's lower back, and he playfully shook the hand that had been on the boys butt.
"Yike's! I felt the heat on that one! I think you almost burnt my hand!" Goku teased but winked.
"Daddy! S'not dat bad!" Gohan huffed, but couldn't keep the grin off his face as more loud and bubbly farts roared out of his behind.
Apparently the cloth diapers and plastic pants did NOTHING to hold back the sound, or the smell as Goku wrinkled his nose.
even Gohan reached up and held his own nose.
"Phew, I stinky!" he coo'ed.
"There's a understatement little guy." Goku said, getting up off the chair and cradling Gohan to his chest still, with a arm under the boys butt.
"Daddy, what you doing?" Gohan asked, as he blasted out more fart's.
"Besides having you toast my arm? I'm opening up some windows..I think next year I'll burp you outside..Your a little more rotten then normal buddy." Goku chuckled. 
"hehehe Well I mighta been having wots of tofu, and avoiding the potty cept for going tinkles for the past 3 days." Gohan commented, and was about to give a wicked grin when he scrunched up his face instead.
"...Yeah ok, no more tofu for you." Goku said, though he doubted Gohan heard that.
Since Goku could feel the big baby straining and bearing down, and well, one look at the boys face and it was clear he was trying to go poopie.
"Is somebody gonna make daddy a present despite it being his own birthday?" Goku teased, and then gently, but firmly pressed down on Gohan's tummy.
Gohan's grunted, but nodded, and his face was turning red as he kept grunting. but this time it wasn't from any sort of embarrassment, but from the sheer effort he was putting into making his uh-oh.
as a vein started to appear on Gohan's forehead Goku sweat dropped.
"Uh buddy, maybe relax, I think your gonna hurt yourself, or go a whole new level of super sayain." Goku said.
"T-Trying to..hafa..But..not.." Gohan grunted.
A light bulb clicked for Goku as he realized that Gohan's plan had had a unfortunate side effect.
"oh buddy! you're all backed up!"
Pressing his hand onto Gohan's tummy and moving his fingers, Goku used the same move that master Roshi had used on him the one time Goku had eaten 12 boars and then been unable to pass the meat.
'Let's see, here..then here..and end with a firm push andddd..' Goku thought, moving his hand and waited.
he didn't have to wait long as Gohan went from a pained faced to gasping, and with a massive gross fart, the back of the boys diaper suddenly filled up, sagging and a rotten smell filled the room.
"P-Pooping daddy!" Gohan cried out.
a hand on the boys bottom, that was quickly getting over whelmed by the growing mess could of told Goku as much, but he smiled and kissed his son's cheek.
"Yup, you sure are!"

By the time Gohan had finished with his movement, his diaper was almost down to his knees in the back and he was shocked the plastic pants hadn't bust. 
he was one super messy boy though, and his stink was making him gag as daddy carried him with hands under his armpits towards the bathroom.
"I think we're gonna have to call it for these diapers and plastic pants buddy. you do have more right?" Daddy was asking.
Gohan nodded, the strain of everything he had just done had left him semi exhausted as they were in the modernize bathroom Bulma had built onto the house.
"Daddy's just gonna give you a rinsing and then a bath buddy, your plastic pants may be holding but your diapers lost the fight." Goku explained, Standing Gohan by the toilet and then fiddling with the controls of the bathtub.
"but.. wanted a real diapie change." Gohan whined, his thumb heading for his mouth.
"Buddy, I can do a shower and bath time for you in 20 to 30 minutes, or waste 40 of them just wiping your butt." Daddy said, rubbing the back of his head. "Your choice."
"...Tubby time."
Daddy opened a few windows in the bathroom, it was needed for the steam and well, the SMELL and then as he got the water running nice and warm, he turned to Gohan and raised a eyebrow.
"I'm..not sure if I should take the diaper off before standing you in the tub or after." He said, looking sheepish.
Gohan giggled around his thumb, then moved past daddy to get into the tub, with the drain unplugged and the water just pouring in it wasn't even ankle deep.

A hour later, and after washing out the tub several times, both had realized the mistake, but Gohan was playing with a mixture of bath toys and Goku had gotten rid of the soaked and smelly diapers, tossing them into a mountain area.
(Ironically or perhaps not, while no one would know the other was responsible, Hercule had been giving a TV lecture about how to deal with the wild dinosaurs and how marital arts could protect you.. when the filthy thing had landed on his head. karma in a fashion.) 
Now however Goku was just smirking as he watched the great battle of the toy boat fleet take on the dreaded rubber ducky and rubber froggy menace. 
'he's such a goofball. but he's MY goofball' Goku thought lovingly.
As the fleet managed to take down the menace Goku called for a time out, and then got the bar of soap.
"Um..Daddy. I can wash myself." Gohan said, squirming in the water and getting all shy.
"..I can wipe your poopie butt but not wash you?" Goku asked, sounding amused. 
"...well when you put it THAT way.." Gohan said and giggled. 
washing the boys down, and then his hair (and making sure to use the baby shampoo) Goku drained the tub and dried Gohan off with a towel, then took anther one and wrapped him up tight in it and carried him back to the boys room.
"How's it feel being all squeaky clean?" Goku asked, kissing Gohan's forehead before setting him on his bed.
"Nice daddy! Thankkkkk you~"
"heh, your very welcome." Goku chuckled. 
Tugging open Gohan's bed time drawer, there was lots of folded cloth diapers, but only one pair of clear plastic pants.
"Remind me to tell your mother you need anther pair." Goku said, then tugging out a hefty stack of the thick terry cloth diapers, and grabbing a few diaper pins, came over and got to work.
Soon enough Gohan was in 5 of the diapers, and Goku tugged the plastic pants over them with ease, though Gohan was sulking a little.
"what's wrong buddy?" He asked.
"wanted thicker!" Gohan whined.
"oh, but if I made them TOO thick, you wouldn't of been able to wear my OTHER gift for you." Goku chuckled and winked.
"...huh?"
"one second." Goku said, then disappeared using his Instant transmission move to go into a spot by the house where he'd stashed a box, and opened it before teleporting back. 
getting what was in there made hadn't of been easy in the afterlife, but Gohan was worth the effort and Goku came back, holding a onesie that was in the orange color of the gi he wore, and had Piccolo's school for marital arts on the back.
"what do you think? King kai helped me ma-" Goku was saying, holding it up.
then Gohan tackle hugged him, knocking him to the floor and was hugging him.
Eeeee! I wuv it! fank ku fank ku fank ku fank ku!" Gohan squealed, and honestly his squeal hurt more then the tackle had, and for a second Goku worried about the windows breaking.
"this will have to go under your bed with your other little guy stuff, but for now, how about daddy gets this on you and then we'll go out and play tag?" Goku asked.
His answer was a big smooch on his cheek, and a crinkling of the plastic pants as Gohan wiggled his bum back and forth.

Dressed in his onesie, and holding daddies hand, Gohan waddled outside and was just so happy. sure he only got a little bit of time with daddy every year, but daddy always one up'ed himself. 
as they started to play tag, with goku purposely letting gohan get the best of him, the big baby only had one thought.
'I can't wait for next year!'

The end