A/N: My first instinct about this idea was to turn into a B Plot... I should have listened to that instinct... I couldn't come up with much... But I hope you enjoy anyways...

Chapter 11: Just One of Those Days

Katsuki Bakugo hated his situation. He didn't know why he was dragged there. Well technically he did, for some reason "Magic" decided he would be the perfect Element of Honesty.

But still he hated this, and the other five didn't seem to mind… mostly… it was hard to tell with Shoto.

If it wasn't for the fact that Twilight seemed to be right about everything he would have run away to figure out a way home on his own.

He also had to admit it wasn't all bad, Ponies knew he was awesome, there were plenty of places to train (he had secretly gone to the Everfree forest to fight monsters for training). Plus the whole super strength thing wasn't that bad.

But still he couldn't wait to get home and either pretend it never happened or forget about it.

Unless he died… then he would probably try to come back as a ghost and haunt whoever sent Twilight back in in time.

And considering he didn't know what that thing that kidnapped him in the Everfree Forest was, it was possible.

He began to wake up after another day of training in the Everfree Forest.

As he did he felt off…

Just like there was something different.

Then he noticed something trailing off his head.

Then felt something off about his crotch.

Then he fully woke up.

"WHAT THE FUCK!" yelled Katsuki waking everyone in the library.

However Twilight wasn't done with the renovations to the library so the boy's room was still the same room.

So everyone in the room stared at the screaming mare in Katsuki's bed.

A mare the same colors and Cutie mark as Katsuki… but had long pigtails in addition to the usual spikey mane.

And immediately they knew who she was.

"Kacchan?" asked Izuku.

"You want to die Deku!" yelled Kacchan almost on instinct.

"Is that seriously how you respond to turning into a mare?" asked Spike.

Not too long later the girls were told what happened.

"Okay! I have no idea how this happened!" admitted Twilight.

"So it's not a spell?" asked Izuku.

"There is a spell, but it's only temporary… and only the most powerful unicorns can perform it." Said Twilight.

Katsuki stared at Starlight.

"Look if it was me, I would have admitted it by now." Said Starlight, "Besides the spell doesn't affect manes."

Katsuki still glared at her, consdering how much the two bickered it made sense he didn't buy it.

That was when Spike burped up a scroll. It was a letter from Princess Celestia.

"I don't know what could have possibly happened I'll have Twilley and Moon Dancer look into it, but right now I'm as stumped as you are." Read Spike.

"We can check with Zecora." Said Twilight, "She might know something."

Since arriving in Ponyville they had met Zecora thanks to the fact that Twilight trusted her with the knowledge of her insistence.

"Fine! I'll go see her!" yelled Katsuki.

Katsuki stormed out of the library.

"Somepony should make sure he doesn't blow anything up." Said Twilight.

"I'll go." Sighed Izuku.

"Are you sure?" asked Twilight.

"You might him angrier." Said Ochaco.

"I'm sure it will be fine." Said Izuku.

He managed to catch up to Katsuki who was glaring at everyone staring at him or rather her.

"So…" said Izuku.

"Shut it Deku." Said Katsuki.

Izuku was silenced.

"OH MY CELESTIA! TWIN TAILS!" they heard Everlasting yell out.

"You want to fight!" yelled Katsuki.

However Everlasting was laughing hysterically.

"Oh man! I can't just imagine you showing your dere side in private!" laughed Everlasting.

Katsuki was ready to fight.

"Don't blow her up!" yelled Raspberry.

"Blow up her house instead!" said H.P.

Katsuki actually stared at the three nerdy ponies.

"What?" he asked.

"What the hell guys!" yelled Everlasting.

"Did you just swear." Said Izuku who had gotten used to ponies not swearing.

"Oh yeah, I swear sometimes, I'm not from Ponyville, I'm from San Franciscolt… also my dad is from the Manehattan area. When he gets made he swears more than Kacchan over there." Said Everlasting.

"Don't call me that!" yelled Katsuki.

"Like H.P. said, blow up her house! It will be a be community service." Said Raspberry.

"It's seriously a plight on the town." Said H.P.

"Stop encouraging him!" said Everlasting.

"Clean your dang house Evy!" said Raspberry and H.P.

"NEVAR!" yelled Everlasting.

As the trip bickered, Izuku and Katsuki both back away slowly.

While they did quite a few stares and whispered no one outright laughed like Everlasting did.

"Wait… do you know the way?" asked Izuku, "I forgot to ask Twilight."

"I found her hut a while back." Said Katsuki.

"Really?" asked Izuku.

Katsuki didn't say anything after that.

"Wait… when did you find it?" asked Izuku.

"I've been using the forest as a training ground." Muttered Katsuki get him off his back.

"Oh that's cool!" said Izuku, "And it makes sense… it's a good way to get your mind off everything."

"What's that supposed to mean?" asked Katsuki.

"I mean… I have to get my mind off everything too, I mean I miss my mom…" said Izuku.

"Of course you do." Muttered Katsuki.

Izuku wasn't sure if it was a his default attitude or just him muttering because had a bad relationship with his own mother.

"Not to mention those villains showing up at the USJ, they're after All Might and what if they can kill him… I mean they must have a plan." Said Izuku, "Also what if we forgot! I'll just end up going back to square one when I finally got control of my quirk… and if it's the worst case scenario then One for All will be lost… I mean…"

Katsuki looked at Izuku.

"Shut up." muttered Katsuki.

Izuku sighed.

They made it to the hut. And she noticed that Katsuki was now a mare…

"You don't know why you have suffered from this transformation but you think I could figure out the causation." Said Zecora.

"Why else would I be here?" asked Katsuki.

"Maybe it was something you did yesterday." Said Izuku.

"I did my usual training." Muttered Katsuki.

Zecora began to think and quickly realized something.

"Did you touch any plants that are blue, if so I think I know what it wrong with you." Said Zecora.

"How should I know?" asked Katsuki.

"Kacchan… you have to pay attention to weird colored plants in the forest." Said Izuku.

"Maybe I did, who knows." Muttered Katsuki realizing that maybe he should pay attention… as he still wasn't sure what that plant almost did to Izuku (nor did he honestly want to).

Zecora sighed, thankfully she had the cure that would hopefully work. She gave the two the cure.

"Use this to take a bath and hopefully it will be the right path." Sid Zecora.

"And if not?" muttered Katsuki.

"Unfortunately my theories have run dry, hopefully Twilight Sparkle should come up with a theory that should apply." Said Zecora.

"Whatever" muttered Katsuki leaving with Izuku following.

Not too long later at the Library, with the exception of Ochaco and Shoto, everyone was trying to research what could have caused the transform

"Honest none of this makes any sense!" said Twilight.

"Unless he went to the Everfree forest for some reason yesterday and none of us knew about it." Said Spike.

Twilight face hoofed.

"It's all right, I don't think it crossed any of our minds." Said Tenya.

"Wait… you think you figured it out?" asked Momo.

"There's a plant in the Everfree forest called Poison Joke, it has a magical poison that plays a prank on the pony it touches." Said Starlight.

"Wait… it can change someone's gender?" asked Ochaco.

"Change their genders, shrink them, lose control of their body parts." said Starlight.

"Fluttershy had a stallion's voice when it happened to her." Said Spike trying not to laugh at that one.

"You found about it?" asked Momo to Tenya.

"It was in that book that I read." Said Tenya.

That was when Izuku and Katsuki.

"We found what might be the cause." Said Twilight.

Then she saw he was carrying a container.

"Oh… Zecora thought the same thing." Said Twilight.

Katsuki rolled his eyes as he went to the bathroom.

"What does the blue plant do?" asked Izuku figuring at they might know.

"It magically plays pranks." Said Ochaco.

"Oh…" said Izuku.

After a bit, unsure if it was the case, thankfully once he came out he was a stallion again.

"Why were you in the Everfree Forest?" asked Twilight.

"I've been training there." Said Katsuki.

"Just tell us when you go there." Said Sunburst, "Even the outskirts can be dangerous."

Tenya gave him the book that he read.

"Fine! I'll read this book." Said Katsuki.

"At least it was just poison joke." Said Twilight, "And not something permeant."

They all agreed it was probably better for various reasons not to bring up again.

However the next day…

Katsuki once again woke up.

He noticed that something was off.

He was now a foal.

"What the fuck!" he yelled.

This woke up everyone in the men's room and they saw that he had once again transformed.

"Seriously!" said Spike.

"The poison joke cure should have fixed it." Said Tenya.

In the mare's room, they had woke up because of the scream.

However Starlight was trying too hard to look innocent.

"Seriously." Said Momo.

"I do not know what you are talking about." Said Starlight, but it was clear she was lying through her teeth.

"Starlight…" said Twilight.

"Come on just let him squirm for a bit." Said Starlight.

Thankfully she did reverse the spell.

And hopefully Katsuki learned the lesson about paying attention to what could be in the Everfree Forest.

Or at least he'd known to pay attention to any blue plants… he didn't want to have another joke done on him like that.

Next Time: Princess Celestia comes for an official royal visit. However somepony who wants to take over Equestria. However there's two things about this one... she has an army... and the other is that she was somepony very important in the original time line... Who is it? Well it's probably who think it is... but what will happen? Find out next time!