It's Nightmare Night, and Ponyville is hosting a costume contest with a cash prize. Trixie is hardly going to not do everything to win, no matter how unsafe, questionable or explicit.

Kinks:
Hypnosis. Loads of hypnosis. Barely any setup, instant gratification. Unaware, triggers, you name it. If you know who I am, you know what this is.
Sabotage. Shame on Trixie for being such a terrible role model and sullying this pure and innocent cavalcade of outrageous fetishes with her dirty dirty cheating.

Further Kinks:
Prologue: Toon/Anthro TF
Rainbow: Nerd/Dork TF; Wedgies; (Light) Humiliation
Applejack: Futa; Puppeteering
Rarity: Clown TF; Balloons
Fluttershy: Playboy Bunny; Dirty Talk; Futa
Pinkie: Rubber/Sextoy TF; Nullge; Futa
Twilight: Bimbony

Was going to write this idea for Nightmare Night, but since I saw that any Nightmare Night story of sufficient length and horniness qualifies for Broni-wan-kenobi's Spooky Cloppy Contest I decided to finish it before that deadline and claim that I wrote it for that instead.