Trixie's Tricky Voodoo by Pan 
(Zecora / Trixie)

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>Trixie gets a Twilight voodoo doll after Magic Duel
>The enchantress warns her not to use it too often, and to be gentle with the doll
>Twilight will probably not be in danger, but the more pain inflicted, the more obvious it will be to Twilight that she is subject to voodoo
>Probably
>Seems legit
>Stronger pain also makes it easier to find the doll

>So Trixie just gives it a gentle pat once in a while
>Scaled up from a doll to a pony, it's as strong as a good stinging swat
>Twilight's bottom flares up randomly with pain she remembers from her foalhood
>It vanishes as soon as it appears
>She can't figure out what causes it

>Years pass
>Trixie is forgiven
>But still has the voodoo doll
>"I can't have Twilight hate me again. She can't know about this."
>She stows it under her hat and goes to Zecora, whom she thinks will keep quiet about the affair if she shows contrition
>"The spell on this is strong. Undoing will take long."
>"What do you have to do?"
>"Not me, but us. I need your trust."
>She brews a potion and has Trixie gulp it down
>"The Great and Dizzy Trixie wonders what you're doing."
>Zecora takes her by the hoof to a stump outside Zecora's hut
>"Lean over my lap this way. Be warned, I will make you neigh."
>"Trixie has... reservations."
>She does it anyway, she hated seeing Zecora glare like that

(CRACK)
>"Move your tail, little pony. The harm you feel must not be phony."
(smack) (SMACK)
>"WHAT ARE YOU DOING TO MY GREAT AND POWERFUL RUMP??!"
>"Hush, it will make sense in time. Please, it's getting hard to rhyme."
>Zecora looks way too comfortable like this
>She's sitting upright on the stump with an adult pony across her back legs
>Just spanking away
(WHACK) 
>"Ow! Trixie is glad we are deep in the woods."
>"Has anypony told you these trees have eyes?
(CRACK CRACK CRACK)
>"Your naughtiness will not be disguised."
>"Balanced mojo this doll lacks. We are fixing it with--"
(SMACK)
>The energy was now balanced with that last whap on Trixie's rear
>But Zecora felt Trixie had yet to be punished for her other shenanigans
>Trixie was rewarded with some bonus swats
>Officially, the doll had not balanced yet
>Only Zecora and the more magic-affiliated trees knew the truth

>Zecora stops as weirdly (for Trixie) as she started
>She scoots Trixie off her lap
>"Are we done? Please tell Trixie we are done."
>"We are finished here, all thanks to the pain in your rear."
>"The evil energy equalized once your rump was tenderized."

>"Um, thanks."
>Trixie scurried off in shame (she was good at that) before Zecora got any other bright ideas