Cheating the Cycle of Life- A Padded Pony Collab

"Um... Luna, where are we going?" Rumble asked to Princess Luna, his plain white diaper with green wetness indicators crinkling softly as he walked behind her. Princess Luna turned her head while she still walked.

"My child, my newphew, a pressing question about you has come to my attention," she said with a small frown "And I feel I need to answer to it as fast as I can do."

He nodded, as he kept walking and walking, the stone walls covered in white and red painted plaster giving way to bare stone and mortar walls, and the wide windows allowing the entrance of daylight slowly shrinking, until they got replaced by simple chandeliers that Princess Luna lit up with a simple spell as she passed by them. Rumble Felt nervousness gripping his heart, as he slowed down his walk and looked around him every few steps, before rushing forward to catch up with Princess Luna.

After a rather long walk, Princess Luna and Rumble arrived at a rather large wooden door with rusted horizontal metal supports and a doorknob, which Princess Luna then rotated clockwise. A loud clang followed by a prolonged squeaking sound that came from the door, one that made the colt recoil and  whimper, as Princess Luna then pushed it inwards.

"Come Rumble, my child," she said, as she then gestured to him. He immediately stopped cowering and walked up to Luna as she entered in the room. It was gray, a shiny metal box on a stone stool shaped like a pillar in the middle of the room below the chandler, and with a black metal frame on the wall on the right from the door and an oval mirror at the opposite side of the room.

Princess Luna then lifted him up with her magic, moving him next to the frame, which made him whimper in protest due to the suddenness of the movement.

"Fear not, for this will not sting, because I do not wish so." she said, as she grabbed four ropes from the box and as she used her magic to put Rumble in a spread eagle position then grabbed a  "However, you must deprived of your mobility."

Rumble nodded and gulped, as she let Princess Luna move the rope around his hooves, before making a knot, and then making it pass on the frame, making yet another knot, until all of his limbs were tied to the frame, basically suspending him.

Rumble blushed and snorted, clearly flustered.

"Uh-hu... this is odd." He  said, as Princess Luna grinned at him "I do like feeling as helpless as a baby, but... never this way... then again, mommy would never hurt me... I'll see if I like this."

Princess Luna's magic aura then enveloped his diaper's tapes, which were pulled away, prompting Rumble to blush and shiver due to the unusual sensation of his lower parts exposed to the air. The diaper fell on the ground, Luna folded it and then walked next to the frame.

Rumble tilted his head in confusion, as he watched Luna look at him without saying a word, only to blush and lower his ears, once he realized that she was staring at his penis and his nuts. His blush grew a little stronger when, looking more carefully, he could see she was frowning and squinted eyes, as if she was... disappointed.

Rumble tried to speak up and ask what his "mommy" was looking for and why, but, in his embarrassment, the words died in his throat, instead coming out as barely-perceptible squeaks. Princess Luna then visibly shook her head, as she turned around to grab a sand coloured envelope, which she then opened with a quick snap, before emptying it on the floor, revealing what was inside the envelope, which only furthered his embarrassment about the situation.

"These are the photos of your peers' genitals," she said, showing off the crotch shots of some of Rumble's classmates at school. Princess Luna moved the mirror closer to the frame where Rumble was tied up, allowing him to make the unmerciful comparison more quickly. "Your testes and your verpa are quite small indeed, of sizes that are more suitable to toddlers than to colts of your age."

Rumble looked himself in the mirror, seeing his nuts, which were little more than a barely-visible sack in-between his legs, and his cock's sheath, which clearly lacked of light. The photos of all his classmates showed testicles that were extremely prominent, some even reaching the knees, and penises that nearly touched the owner's navel.

"Ugh... why did she had to dig those out? I already know I have a a baby's dong..." he muttered to himself "But maybe.. it fits me."

The colt squeaked and his face went beet red with embarrassment. Princess Luna's smirk grew, as she took a pink diaper with purple hearts and an elongate light pink rod from the same box.

"Maybe you'd be better suited as a little filly," Princess Luna said, making Rumble squeak again.

"W-what?" He asked, as Princess Luna then proceeded to move the rod next to his butthole, which caused him to immediately cover it with his tail. "H-hey! what are you d-doing t-there?"

Princess Luna slid the tip of the rod inside Rumble's ass, which made him stop to whine for instead stare right in front of him with widened eyes and the strongest blush he could muster.

"I am just... getting you in the part, to to speak." She said, as she pushed farther, causing the colt to lower his ears and bite his lip, as he felt himself conflicted, about the sensation he was feeling right now.

"This is uncomfortable, but... I like it?" Rumble thought. He yelped, once Princess Luna firmly inserted the object in his anal cavity with a plop. "But why?"

Princess Luna then unfolded the pink diaper, then set it around his crotch.

"Now let's get the little filly dressed up as it is proper!" She said, taping up the diaper, as Rumble turned his head around, pressed his ears again his head and whined lightly.

"P-please, s-stop..." He said half-heartedly, as he kept looking away. Princess Luna chuckled, as she taped up the diaper and, once she did so, she patted his diaper, making it crinkle.

"You look gorgeous already, my child," She said with a chuckle, as she then extracted a pink tutu and four pink frilly booties from the box "But you are missing some garments!"

The sight of those pieces of clothing alone was enough to make him yell "Stop!" and struggle around. However, as he did so, he felt something going from his chest, down to his crotch, and making his sheath quake and move around.

"I will not, my little niece Rumbley," Princess Luna said, as she slipped the booties on Ruble's small hooves, in spite of his movements and pleas to stop, and securing the tutu around his waist. With this done Princess Luna moved aside and pointed at the mirror with her left hoof.

"Behold, your new attire!"

Rumble saw himself in that utut and in those booties in the mirror. This, coupled with the fact that the mirror was compounding his helplessness, made him feel tingly in his lower parts and in turn creating a little bulge on the diaper. Realizing that, he gasped and then squealed, his ear shot against his head.

Princess Luna then smiled, as her horn lit up. Shortly thereafter, Rumble felt a vibration coming from deep inside him, shaking him all over, making him feel uncomfortable and good at the exact same time.

Rumble wished to ask something, but his confusion and his shyness forbade him from asking Princess Luna about what was going on, leaving him squeaking, squealing and blushing while tied to the frame. The vibrations stimulated him in ways he almost could not understand, his little dong quivering and forcing a tiny bulge on the diaper, in turn causing him to turn beet red in both embarassed and the guilt of pleasure.

After some time, during which he felt the tingling grow at the same pace the vibrations did, he felt pressure building up directly in his penis. Rumble stared in  front of him, internally panicking, as he didn't understand what was going on with him.

Soon after, he felt strong, awfully pleasing, sensation filling him up and causing him to roll his eyes backwards. He then felt release, as the diaper started to take a grayish coloration on the front and as the bulge got bigger and warmer at touch.

Princess Luna clapped, as she undid Rumble's diaper, revealing that he was expelling a white substance from his dick.

"W-what is that?" The colt whispered confused. Princess luna patted his head.

"That is sperm, my child, which is also a sign that you have entered in that wonderful age called puberty and adolescence."