"Alright you three, I hope you've had fun today." Twilight said with a smile.
"But we didn't get our cutie marks!" Apple Bloom whined.
"Oh, I'm sure you'll get them soon." She tousled the little farm filly's mane. "It's time to get you back to normal though. Can't exactly have you running around with those things without knowing how to control them."
"Finally!" Sweetie Belle groaned.

Twilight stood in front of the trio and localized her magic around each of their members. As with most transformation spells, the return trip always takes far less concentration. The body just innately wants to return to its original form, and just needs a little push. But Twilight's face soon turned to a puzzled grimace as she couldn't feel any change. She tried harder, her magic glowing brighter beneath the Crusaders' bellies. She even broke into a sweat, but still, no matter how hard she pushed herself she couldn't get their dicks to go away.

"That's... odd..." She said panting slightly, punctuating it with a nervous chuckle as she checked over her notes. Zebra magic was quite a bit different foundationally than unicorn magic, and while she was able to adapt the effects of what was originally a cream into a spell, it was dawning on her that a spell couldn't just be washed off. Of course she'd have realized this if she'd tried to get rid of her own alterations first, but she'd simply assumed she could do it without testing in her hubris. She'd practically forgotten they were there anyway, the changes feeling more a part of her with each passing hour since the previous night. "I'm sorry girls, it looks like you'll have to live with those for a while. Not too long, just until I can talk to Zecora and work out the kinks of the counterspell."

All three Crusaders' jaws dropped.
"What's AJ gonna think when she sees?!" Apple Bloom exclaimed. Of the three, she'd have the hardest time hiding the change.
"It's gonna bulge in my flight school uniform!" Scootaloo complained. The scents that arose from the four hormonal ponies over the past couple hours were already causing her cock to stir into action again.
Sweetie Belle shuffled on her feet in silence. She was thinking about what her boyfriend Button would think.

"Girls, girls, settle down. I'm sure everything will be fine. The ponies of Ponyville are very understanding folk - I would know. And I'll be sure to get this fixed by Monday so you won't have to go to school like this or anything. Just... If anyone asks, tell them you got into some poison joke." Twilight grabbed three small coinpurses in her magic and floated them in front of the fillies - their payment for a job well done. each had a leather cord attached to easily hang around their necks. "Now here, two dozen bits each as promised, and a couple of chocolates as a bonus. Also, to help you out in the meantime, take these."

Twilight levitated down some condoms and a pair of lacy white panties down from her loft - both of which were very rarely used. "Apple Bloom, since you're a real leaker, wear one of these so you don't make such a mess." She instructed while using her magic to pull the squishy peen back out of its sheath just enough to put the blue translucent latex sleeve on it. It dripped into the reservoir tip before retreating, and Apple Bloom could only hope they were stretchy. They were, of course. This wasn't the first time Twilight had used sexual magic, and with the few flings she's had she discovered a fondness for boosting their cum supplies. "Sweetie Belle, it's not much, but it should cover you up and still blend in." She spoke in a sweet tone that didn't match the unceremonious magical lifting she gave her to slip the panties up her legs. They were heavenly soft, and on account of the lace, allowed the fur to poke through for better blending. They were tight, but they (un?)fortunately didn't have to contain much. "Scootaloo, uhhh... just keep your wings down." She said apologetically. She didn't have anything to deal with this situation. Usually she'd just 'go for round two,' but that would be a temporary solution that likely wouldn't last until she got out the door, let alone for two days.

And with that, the Cutie Mark Crusaders humbly left the library, tails tucked and knees together. The sun was setting, which meant it was time for each of them to head home. They were all anxious to see what new developments their changes would bring to their lives.

Author's Note

Don't worry, they'll adjust well enough, and everyone's going to be much more accommodating than they might think! I've got a sequel planned eventually, but this took a lot of time and I've got some other things I might want to write first, so it may be a while. Unless of course anybody would like to help out~

Regardless, I hope you've enjoyed my first foray into FimFiction! Feel free to leave any corrections, questions, or suggestions for other stories you'd like to see from me in the comments