Rainbow's Diaper Discovery

by Nido_King

Rating: mature
Tags: My Little Pony: Friendship is Magic, Rainbow Dash, Fetish, Derpy Hooves, Slice of Life
Length: 1287

Derpy walks in on Rainbow Blitz during a very personal moment and decides to help him. Afterall, what kind of momma would she be if she left such a cute baby without a clean diaper? (Contains R63, Diapers, Wetting and Sissy themes.)

Derpy walks in on Rainbow Blitz during a very personal moment and decides to help him. Afterall, what kind of momma would she be if she left such a cute baby without a clean diaper?

(Contains R63, Diapers, Wetting and Sissy themes.)

Written with original author's permission.

Published 2019-07-04 18:50:01 UTC
Last updated 2019-07-04 18:50:01 UTC

The Single Chapter

Stupid, stupid, stupid! Derpy berated herself as she flew hastily back towards the home of Ponyville’s fastest pony, Rainbow Blitz. She had dropped off a package for him barely ten minutes ago –one he looked very eager to see, she had noted– and flown off to the next house on her route, only to realize to her horror once she had arrived that she had forgotten to get his signature to confirm delivery!

With her job potentially on the line, the grey coated mailmare had flown as fast as she could back towards Rainbow’s home, flying erratically as she saw the cloud house come into view. Bursting through the doorway, she came to a rolling stop onto the cloud floor. Sparing a moment to catch her breath, Derpy bound back onto her hooves as she quickly explained, “Sorry, I forgot to get your signature for the delivery and I didn’t know if you would be home still so I flew too fast and I just don’t know what went wrong!”

There was a brief pause as Derpy noticed Rainbow Blitz lying across his couch and staring up at her with a horrified look on his face. It wasn’t hard to see why, as the stallion was wearing a pair of hot pink socks on each leg, a pink collar around his neck, and had applied a glistening layer of lip gloss to his lips. But the most surprising thing of all was the very thick diaper he was wearing, his still hoof pressed into the front from pleasuring himself through the crinkle garment just seconds before.

Neither pony said a word as the took in the scene, both ponies cheeks flushing a bright red as the pieces began to fit together. For Rainbow, his head dropped at the realization that his life was officially over. Derpy had discovered his secret, and she would no doubt tell all of Ponyville that he was nothing but a diaper wearing, sissy freak and then he’d never get into the Wonderbolts and–

Hisssss.

Derpy’s ears perked up as a slight hissing sound filled the air, one that she recognized from raising her adorable Dinky. Indeed, as her eyes glanced at Rainbow’s diaper–ignoring the obvious tent in the front of it for now–she saw the previously pristine white diaper turn a faint yellow colour as the stallion helplessly wet himself. Looking up at Rainbow’s face, she saw the clear fear reflected in his eyes and the way he scrunched up his lip, looking like he was moments away from bursting into tears.

“Aww…” Derpy cooed as she closed the door behind her and began to walk towards Rainbow, a motherly smile on her face. “I think somepony needs a changy-wangy.”

“Wha-what?” Rainbow hiccuped, sniffling as he watched Derpy approach. Was she mocking him?

Giggling, Derpy reached up and wiped a stray tear off Rainbow’s face. “Don’t worry, sweetie,” she said as patted his squishy padding. “Just let Mommy take care of everything.”

“Mo-Mommy?”

“That’s right, sweetie! Such a smart colt you are. Now, you stay right there while Mommy get’s you a clean diaper.

There were many things Rainbow could have done in that moment. He could have broken out into tears, lamenting how his life was now ruined. He could have yelled and screamed, and demanded Derpy get out of his house and never speak of this to any pony. He could have even fled like a scared colt and gone to hide under his bed from the monsters.

But Rainbow did none of that. Instead, he remained perfectly still, his eyes following Derpy as she picked up his sports bag containing all his supplies and trotted back over, his dick still noticeably hard as it pressed up against his soaked diaper.

Reaching into the bag, Derpy began to pull out supplies like a fresh diaper and foal powder, before noticing something near the bottom. Pulling it out, she giggled as she held up a bright pink pacifier, which she quickly popped into Rainbow’s mouth. The stallion offered no argument as he began to suckle his Paci, beginning to calm down slightly.

With her foal occupied with his Paci, Derpy carefully untaped the diaper, the sound of the tapes being removed like sonic booms to Rainbow’s ears as his diaper was untaped and pulled open, finally reveal his small, yet still hard dick to the world. Rainbow blushed even more, glancing up to see Derpy’s reaction.

Derpy said nothing, her smile never leaving her face as she worked to change the stallion’s diaper, working with the ease of a mother who had done this countless times before, only with much smaller diapers. Still, Derpy was respectably quiet as she removed the used diaper out from under Rainbow and slid a new one in its place. Carefully threading Rainbow’s tail through the back, Derpy began to wipe the stallion clean, Rainbow wincing as cold wipes touched his skin, only adding to his already throbbing erection.

Once he was all clean, Derpy sprinkled a nice amount of foal powder onto the stallion’s crotch as she pulled up the front of the diaper, the soft plastic pushing Rainbow’s erection up against him as all four tapes were secured, sealing him into a clean diaper once more.

“There, all done!” Derpy said, giggling as she patted Rainbow on the head. “Such a good baby, being still for mommy for your diaper change.”

Rainbow smiled behind his Paci, always one to adore praise from anypony. “Derpy, I… I…” Before he could say anymore, he felt himself being picked up in Derpy’s arms as she carried him through the house.

“Now, I think it’s time for mommy’s sweet foal to have a nap. You must be tired after all that.”

Again, Rainbow put up zero resistance as he was carried up into his room and placed into his bed. As Derpy pulled the covers up, she leaned over and gave him a kiss on the forehead. “There, all nice and warm. Now, Mommy has to get back to work, but I’ll be back in a few hours to check up on you. Oh, and don’t worry, this’ll just be our little secret, Berry Swear.”

Hearing Derpy invoke Berry Bubble’s unbreakable promise finally caused Rainbow to relax, as he now knew his secret was safer than ever. With one final good bye, Derpy quietly left the room and it wasn’t long before Rainbow heard her exit through the front door, leaving him alone with his thoughts.

Did… did that just happen? He wondered, staring up at the ceiling as the events of just minutes ago continued to run through his head. Rainbow had always dreamed of having a caregiver, somepony who could look after him and change his diaper when needed, so now that he had been given the chance to experience that…

… he realized he wanted more of it. Oh, so much more time to spend with Mommy.

However, that still left one thing to take care of, as Rainbow reached under the covers and pressed a hoof against his diaper, moaning as his dick trembled from contact. Pressing his hoof deeper into his diaper, he thrusted vigorously as he rubbed his soft, crinkling diaper along his throbbing erecting, feeling himself inch closer and closer to the edge, until…

With a thunderous cry, Rainbow came hard in his diapers, harder than he could ever remember having done so, not even from his first time orgasming into his diapers. Panting heavily, Rainbow felt the growing exhaustion finally pass over him as he snuggled into his covers, smiling as he drifted off to sleep in his very sticky diapers, dreaming of his Mommy’s return.