"...Why are my genitals not between the legs I'm currently using?" I/Twilight asked. Twilight/Vesper shuffled her hooves awkwardly.

"Princess Celestia sent me part of an unfinished spell that Star Swirl the Bearded created. He never managed to get it right so he abandoned it and moved on to others." One of Star Swirl's?

"What's it supposed to do?"

"Erm... Nopony knows, so I thought I'd try casting it and-"

"And now my junk's on the other side of the room."

"...Yes..." I/Twilight sighed.

"Great..."

"I could try recasting the spell and-"

"No, that'd be too dangerous. Besides, there's an easier way." I/Twilight turned to Vesper/me. "You said you knew a body swap spell, right?" She/I nodded.

"We're all Unicorns so I can just swap twice and we should be fixed," she/I explained. "I'm gonna switch with Dad first since... This," she/I motioned towards her/my general butt area, "is disturbingly uncomfortable."

"Alright, let's do this." Vesper/I charged her/my horn before firing a bright, white beam towards me/Twilight. I/Twilight closed my eyes from the brightness as the spell washed over me. I/I opened my and I/I was back in- Buck! I/Twilight was still in Twilight's body, and Vesper/I was still in mine. "It didn't bucking work!" Vesper/I looked pissed.

"What?! I've cast this spell plenty of times before, why doesn't it work now?!" Well, it could be...

"It's possible that Star Swirl's spell has counter measures." Wait a minute...! "Actually, now that I think about it; why did Celestia send it to Twilight in the first place?" Vesper's/my eyes narrowed.

"What're ya suggesting?"

"I think this might be some kind of test. If I'm right, it's pretty likely that the spell might not actually be Star Swirl's at all. Celestia probably made the spell herself and put in counter measures to stop Twilight fixing this in any other way than how she was supposed to." Vesper/I nickered.

"Well, knowing that bitch..."

"But what's the test for?" Asked Twilight/Vesper. "What do I do to complete it?"

"Completing it is obviously fixing what the spell did." I/Twilight nodded in agreement.

"I think the point of the test will only become clear when it's completed." Twilight/Vesper tilted her head in confusion.

"You seem more... Logical than normal."

"Your brain is giving me a lot more room to think. It's pretty trippy."

"Um... Okay." She took a deep breath, exhaling after a few seconds. "How do we figure out how to fix this?"

"No idea." She groaned.

"Fantastic..."

"Sun-Bitch said the spell was incomplete, right?" Asked Vesper/I. "Maybe she wants her to finish it."

"We may as well try," I agreed. I teleported the paper to just in front of me and held it with magic. Is it me or is magic easier suddenly? Nah, it's probably just me. I read it again.

'A mark of one's destiny'... Could it mean cutie marks? Hey, we don't have our own cutie marks! All our skills are different kind of magic which is mental skill, so why didn't our marks change as well? Unless marks don't work how I think they do... I/Twilight scratched my/Twilight's chin.

"You got an idea?" Asked Vesper/I.

"Gimme a few minutes, I wanna follow this train of thought," I/Twilight replied.

If I'm right about how marks work, then, unless the spell changed our mental state, our marks should've stayed the same. If I'm wrong, and marks are a destiny thing, there's a good chance that the spell could be about fulfilling prophecies and destinies. It'd be great if I had memories of education right now... A pang of mental pain washed over me, bad enough for me to cry out and screw my/Twilight's eyes shut.

Alright, kid, the old man wants you with us so it's time for me to teach you how to fight.

I can take anything you throw at me.

Oh really?

THWACK!

Argh! What the buck was that for?!

Lesson one; DODGE!

THWACK!

Gah! How the buck is this training?!

Kid, if you weren't such a dumbass, I wouldn't have to teach you like this.

Striker's right, y'know; it wouldn't be so bad if you'd paid more attention in school.

Stop calling me stupid!

Then learn!

THWACK!

Ugh! (It'd be great if I could remember stuff from school right now...)

I flashed back to the present. I'd/Twilight'd managed to keep my/her balance. The other two were just watching me/Twilight. Woah, that was a big one... I/Twilight rubbed my/her temples with my/her hooves. Who is this 'Striker' mare? Wait a minute...! If that flashback was right, I might not know about cutie marks in the first place!

"Twilight!" I/Twilight barked, making her/Vesper and Vesper/me jump.

"Y-Yes?" She/she asked.

"Am I right to think that a cutie mark can appear or disappear at any point that its owner stops being good at whatever it represents?" She/she looked confused.

"What? No, that's completely wrong. All Ponies have a per-determined mark, though nopony knows how or why its chosen. There are rumors that there are ways to separate a Pony with their mark and even give them a different one, but its never been proven."

"Does that mean our mark skills have stayed with our bodies?"

"I'm... Not sure. The cutie marks themselves have, but..." Hmm...

"Earlier you were set on fire. Why?" Twilight/Vesper hesitated.

"I tried to pick up some parchment to ask the Princess for help reversing the spell, but whatever my magic aura touched ignited. Including me..." I turned to Vesper/me.

"Try summoning a Support Circle."

"Okay," she/I replied. The Arcane Circle quickly spun into existence below her/me. "Woah! That was much easier than usual!" And magic's been easier for me. That confirms that our marks are locked to our bodies and not our minds, so maybe completing the spell involves getting our own marks back.

"Alright, I think I have an idea of how to undo this spell."

"How?" They asked at the same time.

"We're gonna have to earn each other's cutie marks."

Author's Notes:

Cleverness, ftw!