I decided to uploaded this as it was never uploaded much elsewhere. Had a nice description to this too, which was almost lost save for a reading of it on youtube.

https://www.youtube.com/watch?v=SjHbwjBpa5E

EDIT: finally transcribed mostly.

~

Enough!” Twilight Sparkle shouted, Applejack and Rarity suddenly looking her way.

She got fed up with their constant bickering at her very first slumber party. Every fun-loving even she planned from her “Slumber 101: Everything You Wanted To Know About Slumber Parties But Were Too Afraid To Ask” book had gone horribly wrong, because they couldn’t knock off their little feud.

“I had it up to here with you two,” she continued, before tossing her book to the ground in anger and stomping out of the room.

Applejack and Rarity stared at the door for a moment before Applejack started in with “This is all your fault!”

“MY fault?!” Rarity exclaimed. “YOU’RE the one who started it! Traisping around with your ridiculously muddy hooves, being so INCONSIDERATE of Twilight’s floor, and you just wouldn’t let it go! You just had to—!”

She was interrupted by Applejack thrusting her finger against her chest angrily.

“Y’all put some hay into that, you nitpicking little varmit! Twilight didn’t give two hoots about my hooves being—!” Applejack began before Rarity slapped away her hand angrily.

“How DARE you interrupt me! You have no right to—!”

“I’ll interrupt you whenever I feel like it!”

“TWICE! Plus now! Oh, the nerve! Oh, I certainly can’t STAND you, you… bumbling baffoon!!”

“What?! Ya’ll take that back, you overanalyzing, little goody-two-horseshoes, good-for-nothing ATTENTION WHORE!!”

“Did—?!” Rarity’s eyes were wide with shock. “Did you just call me a whore?!”

“Hmph. An attention whore an’ a regular whore ain’t the same.”

“You…” Rarity angrily shoved Applejack backwards.“How dare you! You have no right to [adhere?] to a lady like me in such an ill-mannered and raunchy means.” (Maybe I should slow down and pronounce more…)

She shoved Applejack once again, knocking her off balance and onto the bed. Applejack was terrified in every sense of the word. She spoke up. “N-now Rarity, hun, sugarcube, ya’ll just calm down now. I wasn’t thinking when I was talking. No hard feelings or nothing, right? Er…”

Rarity stomped her hoof angrily, her eyes narrowing with rage, her cheeks blushing, her fist clenching. Without even so much as a move to the door, she used her unicorn magic to lock it, and started to crawl into the bed, forcing Applejack’s legs apart and making her way between them.

“If you think for a second that I’d let some careless half-wit like you call me such a thing, you got another thing coming, missy! Oh, you better believe that you got another thing coming! IT! IS! ON!” Rarity said, her hand painfully gripping Applejack’s breast as she said “on”.

With a squeak of pain and a hurried attempt to crawl away from Rarity, Applejack spoke up, “O-okay, Y’all win, Rarity! Just calm down!”

The second Applejack finished her sentence, Rarity screamed in an angry, […], horny rage “SHUT UP!” which muffled the sound of Twilight trying to open the door. “You put your fingers in me this instant!”

Outside, Twilight (who prepared some more s’mores and more masked zuccini to try to start the slumber party over again from the beginning) knocked on the door and shouted “Uh, girls? Why did you lock the door?”