Pinkie gasped as she finally spotted one particular guest, diving into the crowd to pop up right next to the magician mare. “Heya Trixie! Are you having a fun evening? Are you? I love what you’ve done with your costume!” She walked on two legs for a moment as well before doing a cartwheel, the bells on her jester cap jingling.

Trixie was watching her with a smirk, one eyebrow raised as she pulled off her top hat and reached into it. “Oh yes, Trixie is having lots of fun already. And Trixie is quite proud of her costume, but surely you can’t judge a magician costume without seeing some magic tricks as well.”

“Ohhhh, is that what your costume is? I thought you were dressed as the protagonist of a self-indulgent and diverse clopfic somepony sat at home to write at 1 AM instead of going out for Nightmare Nmmmf!” Pinkie cheerfully continued to talk into the gloved hand pressed over her mouth, at least until her eyes started to follow the pocket watch swinging in front of her face, her mouth slowly sliding sideways around the hand to keep talking. “Oooh, that’s a really pretty stereotypical hypnotic focus.”

“Yes yes, now keep watching the-” Trixie paused and blinked as she stared at the mare already staring blankly into space with wide eyes filled with swirling spirals. Spirals that weren’t even the right color. “...Right. Trixie will just… do her thing then.”

There was a snap and Pinkie blinked, squeaking inquisitively as she looked around.

Trixie snapped her fingers again to draw her attention, smirking down at her. “There you go. Trixie would say that you should tell these ponies something about your costume, but Trixie doesn’t think you will be talking much at all for a while.”

Pinkie blinked again, then started squeaking some more at the silly filly, bouncing on her big pink rubber high heels to show off her costume. Surely anypony would be able to tell that she was Pinkie Toy the needy null sissy fuckdoll. She pranced and posed some more, showing off her big inflated pink latex mane and tail and her shiny black rubber skin with the hot pink lines and hearts on it and the lighter pink frills marking her printed-on pink rubber panties, one hoof rubbing and squishing the throbbing pink null bulge between her legs.

“Puppet, fuck her ass.”

Pinkie paused in her posing, turning her head towards the voice but finding herself pinned down instead as her friend mounted her from behind, her body going stiff and rigid like a good rubber fuckdoll. She let out a long squeaky moan as Applejack’s huge cock stretched out her rubber fuckhole and pushed into her.

“Don’t’cha worry, Ah’m not just gonna fuck yer ass without asking.” Applejack huffed and panted, her cock immediately growing even bigger and pushing against Pinkie’s rubber stomach.

Pinkie giggled and squeaked, keeping her pose and drooling from the pink rubber lips around her face fuckhole, moaning again as the first load of Applejack’s cum gushed into her and down into her legs, filling up her hollow hooves. She wasn’t exactly allowed to participate in her own contest, but if she managed to fill her whole fuckdoll body up to the top with cum before the end of the night she would definitely have the unofficial best costume.

Twilight frowned as she walked around the party again, wondering why she hadn’t seen any of her friends so far. She’d arrived a bit late after getting a bit stressed out over the details of her costume of Mare Unicurie (especially over what level of thaumic glow would be historically accurate or tasteless), admittedly, but she was pretty sure that she wasn’t late enough for any of them to have left yet. She was definitely sure that the costume contest hadn’t happened yet, and she knew that none of her friends would have wanted to miss that.

“Twilight Sparkle! There you are!”

Twilight stopped and turned around to see Trixie walk towards her. Her mind wondered for a second about the mare’s costume before she shook it off. “Hello, Trixie. I don’t have time right now, I’d hoped to find my friends first.”

“You will have to make time! Trixie is going to prove once and for all who the superior magician is.”

She sighed and raised an eyebrow at the other unicorn. “Really? You want to do this now, right here? You don’t have anything better to do today?”

Trixie puffed out her chest. “Trixie is here as a magician. So to win the costume contest, Trixie will prove that she is a better magician than you, Sparkle. Thanks to the power of Hypnosis!”

Twilight stared blankly at the pocket watch the other mare was dangling in front of her face. “...Trixie, hypnosis isn’t even real magic. There’s no proof that it even works at all, it only shows up in shows in Las Pegasus and places like that.”

“If hypnosis doesn’t work, then Trixie is sure you won’t have any reason not to watch her pretty shiny pocket watch to prove it.”

Twilight considered rolling her eyes, but it was much easier to just let them move left and right along with the watch. “I’m telling you, Trixie, there’s nothing to prove… I don’t have time to watch your pretty… shiny… pocket watch all night. You’re not going to… hypnotize…”

There was a snap and she found herself blinking the colors from her eyes and looking around in confusion.

“What was that, Sparkle?”

Twily giggled and turned to Miss Lulatoon, bouncing lightly on her hooves and sending her chest fluff bouncing as well. “I said that I don’t have time to watch your pretty shiny watch all night if we’re going to win the contest~!”

“If we’re going to win the contest?”

“Well, obviously you’re going to win, Miss Lulatoon, because you’re smart and amazing, but I thought maybe I could get second place if nopony else wants it?”

Miss Lulatoon smirked at her. “Well, Trixie supposes someone will have to win it. Remind Trixie what costume you’re going to win with, again~?”

Twily giggled. Miss Lulatoon asked silly questions like that sometimes, but Twily knew she only did that to show everypony how silly Twily was. “I’m your silly sexy bimbo stage assistant Twily Sparkles, of course~!” She pranced and posed, showing off her large juicy flanks with her big proud BIMBO cutie mark under a too-short skirt, her big, round, bouncy chest fluff, her slim painted pink hooves and her plump glossy pink lips, not to mention her super cute pigtails done up with a pair of bows.

Miss Lulatoon smirked and squeezed her flanks, making her giggle and moan and pose some more.

“Not bad, you might just manage if you show off like that. But perhaps you’d like to see your competition first?”

“Sure thing, Miss Lulatoon! Whatever you say~!” Twily straightened up and bounced on her hooves, happily following after Miss Lulatoon, almost as eager to see all her friends’ costumes as she was to be the bestest and obedient-est sexy slutty bimbo assistant for Miss Lulatoon.

Author's Note

Happy horny Nightmare Night, everyone!
If this does well, I might write a short epilogue. Or I might procrastinate and not write a thing until the next major holiday. I'm a man of mystery.