Derpy didn't know where she was or what went wrong - all she knew was that her ass felt fantastic! Ever since she found that playful plant when delivering Spitfire's mail, she couldn't help but get plowed in the ass after every couple delivery stops along her route.

She saw the clock on Town Hall. "Oh no I'm late! Sorry mister..." She pulled herself off in her panic, only to find the stallion had already been fucked unconscious, although still somehow hard, a look of bliss on his face. She shrugged and took to the sky, landing at Dr Hooves' house and knocking on the door. It opened almost immediately and the Doctor stepped out.

"Hey there Derpy! Ready for lunch?"

"Yes-sirree Doc! Where were you thinking of going for lunch? The Everfree Forest sounds pretty good to me right now."

"Um... Derpy there aren't any restaraunts in the Everfree - plus it's rather dangerous..." the Doctor said with a concerned look.

Derpy's eyes straightened for a second in realization and she put a hoof to her head "Oh yeah, silly me! You lead the way then."

Dr. Hooves led Derpy towards the center of town, looking around suspiciously. "Hey Derpy... doesn't it seem like town is awfully quiet today?"

Derpy was distracted, watching the wobble of Dr. Hooves' delicious, sexy balls. "Huh, Wah? Maybe. I hadn't noticed" She sauntered up behind him and pressed her snout to his balls and took a deep sniff, causing his balls and ass to clench in surprise, and lust if he had to admit. "Hey Doctor, do you mind if we skip lunch? I've got another hunger here that needs filling..." She turned to him, revealing her winking pussy and gaping, dripping ass.

Doctor Hooves took a step back. "Woah there! This escalated quickly... Is it heat season again or something? Derpy are you really ok with this? Someone could see us out here!"

Derpy wiggled her shapely rear and clenching ass at the Doctor and played with her clit to distract herself; it was really hard not to pounce on him right then and there, but she liked Doctor Whooves and didn't want to scare him off with her newfound unquenchable lust, her warm darkness, deeper than the sea. "You said it yourself Doctor: town's dead today. I doubt anyone will come out... and if they do, they'd probably just want to join in."

"What was that last part?" he put a hoof to his ear. with a look of concern.

"Nothing important, now come fuck my ass!" Derpy's eyes developed a desperate, unhinged look.

Something clicked in the Doctor's head. "Oh... Oh no... This is very bad indeed! Derpy dear, if you'll humor me, I think you'll find this quite a bit more enjoyable. " He took his sonic screwdriver out of the pocket in his scarf and clicked a button as it whirred to life.

Suddenly Derpy felt her bowels shift, then some lumps started flowing to her exit. She couldn't possibly contain her moans at the feeling. "Hnaagh!" Derpy jumped a little in surprise as sizeable oval shaped seed popped out of her rear and onto the grass.

That felt WAY too good. The nipples on her unusually large crotchtits were as hard as diamonds and her head was full of warm fuzz. She'd be needing more of that later, no question, but she was embarrassed by her odd new anal addiction, so she put on a strong face. "Heh... Hey Doc look, I'm a chicken! - Angh..." Her mirth was covered up by a look of utter ecstasy as a larger seed parted her ass with its birth. This time she couldn't help but cum, anal sphincter clenching almost painfully on the seed as she watered the grass with her winking and squirting. her front feet lost their balance as she arched her back. "Ohbuck... more! MORE!"

The Doctor watched as the seeds piled up like luggage at a broken baggage claim. "I knew it! We’re up against a Passiflora Coprafilia outbreak! Come Derpy!”

“Haaaahgh!”

Doctor dodged a violent squirt. “No, not that way... – quickly: to the lab! Time is of the essence!” He helped her up and began to walk, but was immediately tackled by Roseluck and Aloe.

Roseluck gave him an unfocused, downright sinfully sexy stare, and Aloe spread her gaped, swollen, hypersensitized ass, leaving nothing to the imagination. “ Y-Youre gonna fuck us in the ass with your delicious cock until you can’t anymore…

Derpy wanted to jump in and help him - or maybe help herself to him - but she couldn’t help but push the latest seed in and out of her ass like a toy, masturbating and watching with a deep blush, indecision in her eyes.

Author's Note

Inspired by 2882730 on Derpibooru.

Yep that was indeed a Made in Abyss reference in there, lol

Anyone up for a sequel later? I think there's more I could do with this, perhaps with Dr and Derpy, managing to escape from this situation and trying to save Equestria, despite Derpy's newfound needs.