Cheating the Cycle of Life- A Padded Pony Collab

Fluttershy was laying on her green couch in her cottage, her rear and front hooves tied to each of the sofa's ends, while, on the table, there was was a pack of adult diapers, wipes, and four shiny tin bottles with a different streak of colour on each one bottle.

"C'mon Fluttershy, stand still, it's just some water!" Rainbow Dash complained, holding a small red liquid sack attached to a green thin tube "I promise it won't hurt!"

Fluttershy kept shivering and firmly setting her tail over her butthole, blushing hard and looking away from Rainbow Dash.

"I-I'm f-fine, really! I-I just need to eat more f-fibers..." Fluttershy said almost in a whisper, as she blushed even harder "P-please, d-don't put that i-into my b-b-butt... I-I am just c-constipated..."

"Fluttershy! You'll feel better, I've done it enough times with my little cousins to know!" Rainbow Dash said, as she moved Fluttershy's tail away, revealing her overly-squinted asshole "Reeeelllaaax, it won't hurt at all and it's for your good."

Fluttershy bit her lip, fluttered her wings rapidly and blushed even more strongly, as Rainbow Dash inserted the tube inside her butt, until it actually peeked into her bowels, at which point Rainbow Dash pressed onto the liquid-filled sack...

Fluttershy's embarrassment, as well as Rainbow Dash's, were at all-time high.

"Ohgosh, ohgosh, ohgosh! I'm so sorry! What will I do, what will I do? My life is ruined!" Rainbow Dash said, packing and eating her hoof nails off, as Fluttershy felt another bowel movement coming, releasing another stream of crap and and making it join the rather putrid and big mass of faeces already absorbed by Fluttershy's diaper, leading her to basically sit atop of a big, stinky, overly-brown beanbag of absorbed liquid poop. Each and every movement made by Fluttershy only resulted in a cacophony of smaller farts, squelches and squishes, along with a resurgence of the odour that inevitably came with them, in turn calling in flies and gnats to fly around the stinky and messy diaper.

Fluttershy muttered something, before farting and squealing again.

"Who am I gonna call? the doc? Twilight? Your mom? I don't know!" Rainbow Dash said, stopping short of eating the truly bony part of her front hooves "Oh gosh! Why am I so stupid? Why? Why? Why did I had to fix your constipation with that enema mix?"

"P-lease, D-Dash, c-change me! I-it's g-getting r-really i-icky..." Fluttershy squeaked again, her vocie now cracking, as more flies gathered "S-sorry, I-I'll e-eat l-less a-apples next time and m-more fibers..."

Rainbow Dash, with her front hooves almost devoid of hoof nails, started to fly around in circles around the house, wailing against herself and her stupidity, not quite listening to Fluttershy's pleas of help.

"Who will I call? How I'm going to fix this?" Rainbow Dash kept saying, until she froze, hovering still for a few seconds. Fluttershy sighed of relief, thinking that Rainbow Dash was finally going to change her monstrously-used diaper.

However, Rainbow Dash disappeared in cyan blur instead, leaving Fluttershy all alone with her unspeakably smelly diaper and the small insects flying all around her.