A Friendly Favor
By Onyx Cheetah

"You want me to do what?!" Remington blinked, gawking at the face on the phone. His friend video called him as she had done many times before, but he hadn't expected a call quite like this.
"I know, it's a bit…. well… weird to ask for this, but work is going way too late and it was an important gift for Hailey. Its importance is why you can't break her mental state either. I need you to be in character as a babysitter until you get her home to me." The palomino looked at him in a serious gaze, her tone told him she meant it and he knew better than to do anything against her wishes especially when she was like this. She was in a tough spot and, even if it was an insane request, she was a close friend who needed help. 
He sighed and nodded slowly. "Okay, tell me what I need to do again."

About an hour after the call the hoss pulled his car up in front of a cutely painted building, playground to its side, the word "Daycare" written across it in yellow. Only it wasn't an ordinary daycare, the word "Regression" preceding the large yellow lettering. Without that distinction and the fact that the playground was much larger in size than normal ones, he wouldn't have been able to tell the difference between a normal daycare and the one his friend sent her girlfriend too. She warned him of what would be coming- her girlfriend would be mentally regressed to the point of being a young kid, closer to a late toddler, and would be acting as such. Not only that, she would also be wearing large toddler clothing. A far cry from the business woman attire he'd normally see Hailey in.
This was all so strange and confusing to him; he wasn't sure what to exactly think about it. He didn't know how to mentally prepare for it either. He tried to steel himself but it was all such a foreign idea to him that he just couldn't really prepare. Putting his car in park, he walked towards the adult daycare.
A dalmatian at the front desk waved a friendly wave as the pony walked up to him. "Well well, you must be Remmy! Melanine gave us a heads up that you were coming! She also told us that you're new to this so we'll take it slow, explain how to handle it, and then bring you to Hailey to take home." Remington nodded slowly, kind of lost, unsure what to say to the energetic and friendly dog in front of him who was quickly getting up.
"First things first, as you were told, this is a mental regression clinic. I know, it's weird… but many people have uses for it. Relaxation from overwork, from stress. Of course there's also people who just enjoy the fetishy side of all this." As he finished that statement the dalmatian couldn’t keep from wagging his tail, a barely audible noise sounding like a rustling of a bag tickled the hoss' ears. "Whatever it's for, we're here to help!" 
Walking into the first room, Remmy saw his first babied out adult, a bunny. His mind emptied, focusing only on the scene in front of him as he stared at the adult bunny in a babyish diaper and onesie playing with blocks. The dalmatian's words bounced from his mind as they continued to walk forward.
"-and that is what we strive to do!" Passing by the next doorway, out of visual range of the bunny, Remmy finally came back to reality. "Now, I need you to promise me not to break her state of mind. Not only is the procedure expensive, if it's broken early, she will be more stressed than before! This could be caused by anything too adult. Like, even a rap album or seeing someone make out on TV. Just keep it G rated around her and keep her comfy and she'll be all right!" Grabbing the door knob to the room in front of them he pulled, swinging it open.
Sitting there in a skirt-all with cute pink tights under it, and a thick outline of what could only be a diaper definitely visible under that short skirt, was his friend's girlfriend. She was strangely adorable though. Like a 3 or 4 year old just sitting there in front of him, just larger. The two of them walked towards the "toddler" and the dog kneeled down towards her, his backside now fairly obviously showing that he was wearing a diaper of his own. 
"Hey cutie, your momma had to stay longer at work. Don't worry though, she got your favorite babysitter to come and get you home! Isn't that exciting?" The "little" palomino pony turned and looked at the large hoss standing there awkwardly, her regressed brain trying to process everything that had been said. 
Slowly as her tiny mind recognized the familiar face in front of her, linking the word babysitter with Remmy in it, she smiled and giggled. "Yeah!" The dalmatian stood up and motioned at Remmy to come closer and say hi. Breathing in slowly not knowing what to say, he stepped up to her.
It didn't matter what he was thinking of saying though, looking down at her this close it wasn't Hailey the business woman staring back at him. Definitely not the same as her usual eyes, stressed and overthinking every visual stimuli she received. These eyes were definitely that of a little cub. Just innocence and happiness stared at him with a smile on her muzzle. He kneeled down to her level and as he was about to speak, she booped him right on the nose, eliciting a tiny sneeze from the mentally older hoss. She began giggling innocently, and he smiled back at her, booping her nose back as well with a beep noise. This wasn't going to be so bad; she was even kinda cute this way.
The dalmatian led them out, the young-minded pony's hoof holding Remmy's the entire time. Giving him a car seat to borrow for her ride home he said his goodbyes to the little horse and offered up his services any time to the "adult" horse. "Just in case you ever need to unwind." Blushing at that, Remmy left the building and walked his new ward to his car.

Placing the car seat on the ground he opened his back seat and helped the "little filly" get inside before grabbing the car seat and trying to get it in, never having done it before. This was all new to him, and having a regressed horse next to him added to the issues. The second he had sat Hailey down, her curious "toddler" nature got the better of her and she began to explore every nook and cranny and crumb left in his car. Buckling the seat in was going to take a bit of effort while keeping her from falling or from sticking some sort of nonsense into her muzzle.
Finally, after many failed attempts, he had achieved buckling the seat in. He wiped the growing sweat off his brow and cheeks and went to go help her into the large cubby chair when he noticed she was gunning for the other door handle. He reached to grab hold of her and pulled her away from it, but he barely had a grip.
Climbing in after her to grab her more comfortably, he climbed over the adult toddler seat. Slipping by her legs, he lifted his arms above his head and went to wrap his arms around her midsection. What he didn't realize was his muzzle was straight in the line of fire. As soon as he grabbed her by the tummy, she grunted and a rumble shook from her rear right above his sensitive hoss nose. Remmy blinked and stared, unmoving. That was unexpected. Squirming in his unmoving grip, Hailey's tail fanned the dirty smell around, engulfing the pony in her scent as he tried to regain his composure.
What came next he couldn't explain at all: to his shock his sheath thickened and his cock grew inside. His mind went into overdrive. He couldn't believe that he would get hard over something so random and innocent as someone passing gas, especially in Hailey's state of mind, against his nose- especially in a public parking lot! It shot him into action quickly. He squeezed again to grab her and lift her with a bit of effort back towards the seat (this time thankfully not letting off some gas) and wiggled his way back out the door, over the seat, till he stood there staring at her sitting in the car seat.
Panting from the quick movement and breathing in the fresh air, his pants loosened. Remmy sighed in relief and smiled, poking the regressed girl on her nose eliciting a new giggle. It was just a fluke, some weird thing that he couldn't explain, and thankfully wouldn't have to. Making sure the seat was all locked in place, he pulled the straps out from behind her, first locking her arms through the strap and next, the waist- he stopped. He couldn't find the buckle for the waist. Bending down to the seat, he looked around and saw the belt holding the buckle leading underneath her bottom.
Going to reach for it a long slow braaap slapped from her diapered rear. Instantly the scent of filly poots entered his nostrils. His fur down his back stood on end as the aroma filled his senses. His horse dick once again roused, beginning to strain against his pants.
He sat there for a minute unable to move, breathing in her gas as his brain tried to rationalize any of the feelings he was having. It was all for naught though, he knew he got hard at his friend's diaper farts and no amount of irrational thinking would let him know differently.
As the air cleared, his mind slowly began working again and his bulge stopped straining. Quickly the hoss grabbed the buckle under her bottom, positioned it and clicked it into place and scrambled out of the car.
Breathing the fresh air in deep, he felt his heart calm down. The stallion didn't even realize it was beating so fast. He closed his eyes, took a deep breath, and closed the door. He would have to do a long introspection once he got home.

Behind the wheel of his car his mind wandered away from the event earlier, and he once again felt clear headed. Humming to the music on the radio he left the strangely turned-on Remington behind in the daycare parking lot. He was just his friend's help once again.
A soft grunt tickled his ear and he turned the music down to listen, looking back in the rearview as often as he could. He could see her playing with her skirt a little and staring out the window but couldn't see anything else going on. Shrugging, he went to turn on the music again when he heard another soft grunt, followed by a soft rumble, this time not drowned out by the music. She was farting, again! He laughed to himself innocently at first, then his brain shot back to earlier when she tooted right next to him causing the… reaction. He blushed, and caught the next rumble, louder this time. 
"Gosh, you're a little gassy girl tonight, huh?" He tried to get his brain off the… weirdness from before, keep it innocent in his mind, but even saying that made his nether regions stir a little. Not to mention the scent that passed by his sensitive nose just for a few seconds. The earthy aroma mixed with a baby powder scent being activated from her nether air rousing the dormant powder. 
He huffed and opened the window, trying to keep from focusing on the strangely intoxicating smell. The hoss sighed in relief, the fresh air once again seeming to clear his mind. On the other hand, the woman in the backseat whined and whinnied loudly like a little filly as the open air flipped her mane all around. He looked back and she cried out holding her hooves in front of her face.
Figuring the smell finally left, he shook his head and closed the window. "Well, stinky girl, how else am I supposed to clear the air?" Seeing her in the mirror though, mane disheveled and tears in her eyes, he sighed. "Sorry hun, I won't do it again, okay?" Her innocent smile in the mirror in response was worth it and he told himself he wouldn't do it again, even if the smell got rough.

Soon after turning off the highway onto a twisty mountain road, one without a pull off, he heard a long grunt and looked back to see the large "filly" wiggling in her seat. The smell almost instantly tickled his nostrils, a smell so much thicker than the toots- this was something more. He blushed suddenly as he realized what she was doing. Looking back in the mirror he saw her lift herself up in her seat, grunting more and more. As he heard more and more grunts the smell became overwhelming, the car filling with the scent of a fully used adult diaper. 
It was disgusting, yet his pants said otherwise. Hidden below the denim, his horse cock strained in its prison, wanting nothing more than to be released. He started panting, his body becoming overwhelmed with this strange need. He didn't understand its reaction, especially to the scent of a full diaper. It should disgust him, but here he was: his cock was threatening to rip his pants and his crotch was soaked with his pre, wetter than Hailey's diaper probably was.
He needed to let his cock out, the pain of the strain was distracting his driving. Maybe if it was let out he could ignore it until it went down. At least it sounded smart to his sexually inflamed brain. He'd just have to keep it out of sight. Didn't wanna cause issues like the dalmatian had said to him by letting the mentally regressed adult see adult things like his rock hard dick.  Staring into the mirror to make sure she was looking away from him he grabbed his zipper and pulled; the strain of the cock against the crotch caused him trouble, keeping the zipper tight together. He pulled again, harder. Finally, the zipper released, his large horse member instantly popping out. The relief he felt was immeasurable, he couldn't believe how hard it was- especially with what it was hard to; the scent of his friend's girlfriend's very filled diaper. 
His dick twitched, a bead of pre forming and dripping down the front of it slowly as he thought about the cause, the scent filling the forefront of his mind again. He breathed slowly, trying to push through the strange thoughts in his head, to ignore it. Just 30 more minutes, that's all he had to last.
Surprisingly, it was working. His brain filtered the scent, and he no longer had to focus on it. His dick, though it was still dribbling pre, slowly receded back down into his sheath.
See! All he needed was to let it out and ignore it! He wasn't disgusting and perving on his friend's girl! It was just weird circumstances that caused-
There was another loud grunt, and a plopping sound. The smell of horse apples hit him so much harder this time, enveloping his senses and enlightening his flame once again. His dick shot up, this time painfully throbbing.
"Oh god, Hailey! You really, really stink hun!" She giggled, taking it as teasing, even as Remmy was whining about his predicament. He was stuck in his car for another 25 minutes or so with a very stinky pony woman in her surprisingly messy diaper, and it was making him go wild. With another loud toot, she sealed his fate, dick twitching as he whimpered.
He looked back in the mirror at her. She seemed to be so satisfied, smiling away.

This time his cock wouldn't go down. The scent seemed to sit on his nose. Every inhale was as intoxicating as the last, sending another shiver up his spine and a drop of pre to his tip. It was beginning to get painful, his cock throbbed and begged for release.
Looking out the window, he tried to find an area to pull off, just to clear the air. Maybe even change her, if possible. He needed to, his hard stallion dick throbbed with every beat of his heart and wasn't going to relax anytime soon in this air. There wasn't any place to pull off though. It was a small road- guardrails on the side of it as it twisted and turned up to higher up hills.
Adjusting himself in his seat his handhoof grazed his cock and fireworks shot through him. In that moment he knew what it was that he was craving the most: he needed to paw, needed to get off as the scent of her used diaper filled his nostrils. 
Looking back into the mirror he noticed her head drooping down and her breathing was shallow. Thank goodness, she was sleeping!  His hand jumped to his dick instantly, no more thought to it. He needed it and now that she was consciously out of the picture he was going to get his relief.
He squeezed softly filling his handhoof with his tender, warm horse meat. Unable to control himself a loud moan escaped his maw. He shut his mouth fast and looked worriedly into the mirror, but she was still fast asleep. Sighing, he shook his head almost deciding not to continue, but as he deeply breathed in from the sigh it renewed his need with a vengeance, the smell from the adult filly's used diaper tickling his brain once more.
Grabbing his member tightly again he moved his fist slowly up and down. Heavenly was the only word he could use to describe it. Being stuck in a car with that earthly aroma emanating from that woman's full diaper drove him so crazy, so wild, so feral. He throbbed with every pump, each throb causing more and more pre to glob up and spill over his already flaring tip. 
He started grunting and moaning, he felt it, his balls started to tighten. God, her diaper smelled so amazing. He loved the scent, he couldn't stop what was coming, he was going to… going to…
There was a whimper and whine in the back seat. Heart jumping, his hand pulled away from his cock and he pushed the throbbing meat as far out of sight as he could, whining. He was so close, so close… but she let out another whimper. Looking back and seeing her wiggle around, she looked towards the front and with begging eyes and in her cute cubby voice she let out a small "I… I need a changie…"
His brain screamed no, his horny brain begging to finish, to stay trapped with the smell. But his heart couldn't tell her no. Even though he knew she was an adult pony, her tiny voice just hit the section of his brain telling him she was just an innocent little girl needing help.
"O-of course sweetie." His voice was shaking, his orgasm was so close, and the scent still made his dick throb. "As soon as there's a place to pull off! Keep an eye open outside!" He tried to make sure she was looking off to the side. He really didn't want her to see his throbbing, dripping stallion cock out. Definitely not with the warnings he was given.
As she stared out the window looking for a place to pull off, he found his hoof instinctively reaching for his dick all over again. He was so close, all he had to do was finish. He kept a close eye on her from the mirror but began pumping his dick softly and slowly, beginning to work his way to his orgasm, once again. Inhaling deeply, he smelled her messy diaper scent again. He bit his lip, stifling his moan as the pleasure overwhelmed. His pre pooling heavily he felt his balls tighten up again. Just as he was about to blow, he heard an excited call. It was Hailey, pointing towards the street in the distance. She had found a turn off.
Oh god. He had to stop again. He felt as if he was edging the hardest he'd ever edged. Sighing again he pulled into the turn off. He blushed and swallowed slowly as he realized he was rock hard and had to step outside. 
Okay… okay he said to himself, even his thoughts were breathless, just get a hold of yourself, you can do it, make it go down!
Another whimper escaped her muzzle as she awaited a change. He couldn't wait too much longer, yet his stallion dick remained as hard as ever. Trying to think past all of the stinky diaper smell that turned his brain to needy mush, he slowly, painfully was able to remember how the clean air kept him clear headed. Quickly he opened the window and breathed the outside air in.
All his normal thoughts finally came back. He couldn't believe he had been fapping with Hailey in the car, let alone to her diaper full of horse apples. She was his friend's girlfriend! And it was a full diaper for fuck's sake! Shame overwhelmed him and his member slowly sunk down. Not fully, he had been too close for too long to completely lose it, but down enough to be able to slip it into his pants and barely zip it up. He sat there a moment longer looking at his still straining pants, a wet spot from his pre soaking into the fabric, and shook his head. This would have to do for now, the "little foal" needed a change.
Standing up outside his car door, almost fainting from too little blood to his head, he couldn't believe what had happened. Even now thinking about her scent still caused him to spurt little beads of pre into his pants. He shook his head. Never again. He couldn't let this thing happen again.
Opening her door, the scent hit him hard. God she stinks so… good. He blushed at the thought automatically flowing through his mind. He slapped himself to keep hold of himself causing the regressed woman to laugh, and even though his cock strained hard again he helped her out of the seat. 
Her diaper drooped heavily as she stood up in the pull off area, and even as he helped to get her to the front seat, his eyes just stared at it.
Laying her down in the front seat, he searched through her personal bag they gave him to take home with her, finding everything he needed to help clean her up- including a new diaper. Grabbing everything he knew he needed to use, he walked back up to the woman in the very bulgy bottomed diaper staring up at him. He stared back at her blushing all the while, her scent still driving him mad. He cleared his throat, grabbed her cute cubby leggings under her skirt, and started to pull them down to leave just the full diaper on display.
There, staring back at him, sat a very well abused pamper. One full of logs and logs of horse apples, the off colored bulging bumps alone let him know this, but it was the scent after the reveal that was the last straw.
As the last shield of her leggings protecting his nose from the full disgusting scent of the diaper- with fresh mess, piddle, and powder- was pulled away, his body gave up holding back. Like a fire overwhelming a dry field the smell engulfed his mind, his body, his everything. He gave one last gasp and his strained cock exploded into his jeans. Horse cum flowing from his member. His balls just emptying as much as possible, load after load staining and soaking into his pants.
It was too much, his knees gave way collapsing forward as softly as he could, barely able to control himself as he landed, muzzle next to the bulgy rear. Another wave of pleasure came over him as he was forced again to smell her full diaper scent, this time directly from the source. His balls sore as he exploded a second time into his already soaked pants. Panting, he closed his eyes and tried to let the wave of extreme pleasure pass.
After what seemed like forever, his balls still twitching though empty, his mind cleared from the extreme horniness that had overwhelmed him. On shaky knees he slowly stood up, finally ready and able to change her diaper.
The rest of the change was thankfully uneventful, cleaning up her bottom and front while taking a lot of wipes didn't cause any of his new found "issues." The only issue now was his newly soaked front, cum globbed all over the inside, and some pushing through the jean material. But to the uninformed eyes it had just looked like he soaked his pants. Hailey had noticed this too, sitting up and giggling at the wet front oblivious to any naughty implications it had. "You nee’ a diapie changie too!" She laughed a sweet little laugh through her words, embarrassing the hoss and making him blush hard. He nodded, laying her dirty diaper down on the floor to deal with later, and buckling her back in her carseat before grabbing spare pants, some sweats he kept in his car.

—-

Driving back down the hill side, Remmy blushed as he passed by the turn off he had to use earlier. There was definitely a wet spot on the ground still from his extreme load of horse cum pooling down his legs as he changed Hailey. But, it wasn't just an embarrassed blush, it had been long enough for his libido to rev back up. He felt heat in his face, and desire grew. His sweats tented unfettered and unstraining- unlike the jeans earlier- as he thought about that scent again, being trapped in a car with it. The more he thought about it the more he could smell it. In fact it was almost as if… it was in the car still. He caught a quick glance at his floor and saw the diaper still sitting there. He huffed and ran a hoof hand along his bulge.
It took only a second of thinking before he turned around to turn into that pull off, grab that diaper, pull his horsecock out and put the diaper up to his nose. He inhaled deeply. Like electricity, his fur stood on end and his hoof paw moved hard on his cock as he began furiously masterbating. It wasn't going to take much to finish again, the scent was so good.
He moaned loud as his load quickly shot out hitting him, the car roof and the full diaper. He was hooked on that scent forevermore. Panting, he dropped the diaper back on the floor and drove off. He knew what he had to do.

He hoped that it wasn't too late for the night as he pulled his car into the empty parking lot of the adult daycare. Empty except for one car, that is. He quickly got out and made his way to the door as he saw him leaving the building. The exact fur he was looking for, the sweet little dalmatian he saw earlier. His clothing looked more like a 90s kid as opposed to his professional outfit he wore earlier. But the thick underwear bulge in his jeans definitely led him to know it was the same puppy as he had talked to earlier.
He turned around, jumping as he saw the large hoss coming up to him quickly, a large shadow in the darkening sky. He backed himself up against the door. Remmy blushed and stopped mid step as he saw it. He didn't want to scare the poor dog. "H-hi! I'm sorry, didn't mean to scare you! Just wanted to catch you before you left!"
As the dalmatian's eyes got used to the light he started to recognize the pony from earlier and relaxed a bit. "W-wow, I didn't expect to see you back, especially so soon!" He chuckled, hand rubbing his neck anxiously as he talked. "We're closed for tonight though."
"That's okay!" The hoss moved in closer, backing the dalmatian into the door. "I thought I'd take you up on your offer of your… services."
The dog looked up at the taller figure backing him into a corner, "b-but as I said, we're closed."
Remmy smiled, "Not those." He leaned down into a kiss, his lust from the day overwhelming him "I wanna have some very strange fun with you…" he kissed him and wrapped his hooves around him, paw sliding down to his bottom groping the thick garment under his pants. "...and your diaper!"
Breaking the kiss, and turning around, Remmy motioned him to follow. The dalmatian stared at him for a moment in shock of what just happened but soon followed after him, tail wagging and crinkling hard.

—-

A loud grunt filled the air mixed with the smell of a newly loaded diaper, the dalmatian squatting over the nose of the hoss. His horse dick throbbed and strained without being touched as the thick white material threatened to touch the horse's nose as it filled with disgusting and foul smelling puppy mess. The pony pulled the dog toward him by his waist after the newest crackling had ended, the third time that night that he had filled that one diaper.
Remmy wouldn't let him change though, definitely not, it was just too great smelling. As the warm bottom hit his nose the dalmatian formed a sort of 69- letting the hoss get his disgusting diaper rear and letting himself get the musky, cummy, horse cock. Remmy inhaled, another horse load exploding from his flared head and landing on the dalmation's muzzle causing him to twitch inside his loaded diaper.
This was the beginning of a long, disgusting, happy friendship between the two.