Alicorn Magic by Anon 
(Celestia / Twilight Sparkle)

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>Stupid alicorn magic...

Hmm...

>Filly Twilight Sparkle studying with Princess Celestia.

>Celestia has to leave due to royal business, tells Twilight not to try casting the spell they were practising until she gets back.

>Twilight wants to impress Celestia so she disobeys her and try's to cast the spell anyway.

>As expected, the spell goes wrong. Big mess is made.

>Celestia soon returns, sees mess, gets angry.

>Twilight desperatly apologizing, make excuses.

>Celestia hushes her and tells the filly to turn around.

>Twilight whimpers, and obay's.

>Golden horseshoose are briefly removed, alicorn magic is gathered and two hard smacks land on Twilights flank, one on the center of each cheek.

>Twilight yelps, Celestia has to stop her from rubbing.

>Alicorn magic kicks in.

>The sting of the spanks don't go away and Twilight's flank has two very red spank marks.

>Celestia puts Twilight in corner nose first, then casts a spell to stop her from getting out of said corner until she allows it.

>Tells her she ill only be let out of the corner when the castle staff finishes cleaning the mess, then report to Celestia.

>Celestia leaves and staff soon come to clean.

>Unfortunately for Twilight, cleaning up her magical mess takes far longer then normal mess.

>It's also a lot of work for the staff, but atleast they get to see Twilight's backside while cleaning.

>Meanwhile, poor Twilight is forced stand still in her corner, unable to move much besides squirming, her flank looking like it's been through quite a spanking session and with a constant, never ending sting from Celestia's hoof to match.

>Needless to say the sniffling, blushing and squirming Twilight will not be casting forbidden spells without her teachers consent.

>All of this from just two swats from Celestia's hoof and a bit of magic.
Worst is yet to come.
Twi's mom & dad are gonna have questions about those two big red marks on her rump.
>"Just what did you do at school, young filly?"
A spanking at school means a spanking at home too.
And it ain't gonna be a little two-smacker.
And of course it is then that Shining comes home, Cadence in tow. Both get to witness the spanking and the corner time following.

>To make thing even worse, Celestia descides around this time that Cadence (whom still foalsits Twilight) is ready to learn this spanking trick.

>Ends up using it on Twilight on occasion. Sometimes infront of the still infant Spike (whom would always giggle at her plight).

>Speaking of Spike, he would also get to experience it.

>When Twilight moves into the library tower Spike ends up staying with her.

>Since the young dragon is firmly under Twilight's care now Celestia teaches her student how to reproduce the trick.

>Magical item is required to replicate alicorn magic, but Twilight manages to safely use it without any issues (much to Spike's dismay).

>She continues to use it as a punishment for her charge in Poniville. Ponyville knows that the resident baby dragon gets punished like any other colt/filly his age.

>Even the CMC got it on couple of occasions.

>When Starlight became Twilights student she got to know it as well.

>Cleaning up the mess made from the mind control incident was not fun, especially with a stinging bottom.

>Eventually Twilight did teach her student how to do it.

>Now it is a common method for punishing naughty students in the School of Friendship.