Oh hell no!

Gray and Natsu were at it again. A new shipment of potions had just arrived and everyone had their eyes on one: the power strengthener. Mira had just unpacked and already an all out brawl had occurred between the men of the guild, Natsu and Gray leading it. Lucy and Erza were trying in vain to separate them from each other when Natsu shoved Lucy who flew into a table, sending a potion flying.
Mira yelled," Everyone move! That potion is a..."
SMASH!
"Sex changer!" She finished. But as she said that, another potion fell on top of the already soaked group. It was a transportation potion.
Oh great.

Natsu awoke in the middle of a forest, with no idea where he was. When he went to get up, something pink brushed in front of his face. He yanked it to get it out of the way and felt a searing pain in his head. He decided to forget about the pink thing for the time being and see where he was. But the pink thing followed him. He then remembered what Mira had said at some point that day.
"That potion is a ... sex changer!"
"Oh hell no!" Natsu shouted. His voice was oddly high,"I'm a girl!"
He looked down at what he was wearing. It was pretty much the same, except his scarf looked a little more fashionable and he had a T-shirt on under his waistcoat. And... He was pretty much flat chested. That was a shame. But Natsu had finally understood what the pink thing was. It was his hair! It was tied up and went down his entire back. He looked around and saw two boys and another girl on the floor. The girl had only trousers and a crop top on. Oh god. When Gray saw him, he was gonna laugh his head off.

Gray was next to awaken. He looked around and saw a pink haired girl standing over him. He instantly scrambled back and reverted into his maker stance. He didn't like the look of this. He looked round and saw he was in a forest. That was odd, the girl was wearing clothes almost exactly like Natsu's.
"Natsu?"
"Yes?" The pink girl answered.
"What the hell happened to you?"
"I was splashed by a sex changing potion. Who even are you and how do you know my name?" Natsu may have known what happened to him, but he was quite dense otherwise.
"What do you mean who am I? I'm Gray! Gray Fullbuster?Are you blind or something?"
"Right, so you're Gray. In that case, Gray look down."
"What the hell?" Gray had looked down at himself and was shocked at what he saw. He was wearing his normal trousers but he was wearing a white mini top with his fairy tail insignia on. Gray was also pretty much flat chested, but he was grateful for that. Something was tickling his back. He flipped it onto his shoulder and found it was raven black and felt like hair. He then realised it was his hair. It fell onto one side and reached just under his top. He looked up at Natsu and said,"Did I get splashed too?"
"Sure seems like it."
"Dammit."

"Hey if we are here, who are those guys lying on the floor?" asked Natsu. Gray, who was the less dense of the two, thought for a minute and answered, "Seeing as we're both girls, it seems likely the blonde is Lucy and the redhead Erza."
"Oh yeah!" Gray facepalmed. Natsu then had an idea that seemed brilliant at the time: wake up Erza.

Erza Scarlet was woken suddenly by being prodded by a stick. She immediately requipped into her heaven's wheel armour before realising something was off. She looked at the girls who had woken her. They were hiding behind a tree, but when they were sure it was safe, they came out.
"Yup it's definitely Erza. I'd know that armour anywhere. It's changed since I last saw it though," said the raven-haired girl. Erza saw certain similarities to Gray. But that couldn't be him, could it?
"Who are you and where am I?" Erza asked. The pinkette answered,"As for the where we are we don't know, but before we answer the who we are look down." Erza looked down at herself and gasped. Instead of her beautiful armoured dress, she had a full on suit of armour with white highlights. And when she went to see what her hair was like in a stream, she found it was short and sort of like Gray's. She kinda liked it. She also liked her one earring look. She requipped into her normal armour and found it exactly the same but with a flat breastplate and blue trousers.
"We were splashed by a sex changing potion so we're now girls and you're a boy. If you haven't worked it out, I'm Gray, that's Natsu and the guy on the floor is probably Lucy," Gray answered her question before it left her lips. Erza decided that for the minute she was going to lie on the floor and think things over. That was going well until Gray and Natsu decided to see if their powers worked as well. "Roar of the Fire Dragon!"
"Ice make lances!"
"Fist of the Fire Dragon!"
"Ice make prison!" Gray trapped Natsu in an ice cage but in doing so, accidentally froze the blonde on the floor.
"Gray what the hell did you do?" Natsu blew his flames onto the blonde, melting the ice. And that was when the blonde woke up.

Lucy was having a strange day. Just before she awoke, she remembered feeling freezing then immediately afterwards feeling like she was boiling to death. When she opened her eyes, two girls and a very concerned boy were standing over her.
"Is he alright? I sure hope I didn't burn him!" said the pinkette.
The other girl gave the pinkette a massive whack on the head, "Natsu you may be an idiot but you do have some control over your flames don't you?!"
"It's your fault for freezing him first, ICE PRINCESS! Ha that's actually relevant now!" Ice princess... Wasn't that what Natsu called Gray when he was annoyed at him? And didn't the raven-haired girl call the pinkette Natsu? It couldn't be...
"Natsu! Gray! Shut up already!"
"Aye sir!" Both girls instantly shut up.
"Natsu, Gray, Erza?" Lucy asked, just in case.
"Yes?"
"What the hell happened to you guys?"
"We'll explain later. First, look down at yourself." answered Erza. Lucy didn't think that was a good explanation but looked down anyway. She nearly fainted. Instead of her usual attire, she had blue jeans and a button-up vest with the same pattern as her top did. When she looked at her hair it was shoulder-length and straight. She didn't mind it.
"What the hell?" Now she thought about it, her voice seemed lower than normal.
"We were all hit by a sex changing potion. Try using your magic a bit. That's what these two IDIOTS were doing before they woke you up" Erza put extra emphasis on idiots.
"Ok then. Open, Gate of the Lion, Loke!"
Loke appeared in front of Lucy, " Hello Lucy, your prince is he... What the hell? When did I switch owners? Who are you? Is Lucy dead? Who are they?" Loke was utterly confused by the whole situation.
"Loke, calm down! You haven't switched owners, I am Lucy! I got hit by a sex changing potion along with those guys. That's Natsu, Gray and Erza over there by the way!" Lucy explained. Once Loke had got over the new Lucy, he asked, "So how are you going to go back to your original selves? This reminds me of that time we all switched bodies, do you remember that?" Everyone paused. No one had thought of that.
"We'll have to find another sex changing potion and get splashed by it I guess," said Gray, "But in the meantime we need to get back to Magnolia so let's go!"
"This doesn't involve transportation does it?" asked Natsu, getting queasy just thinking of transport.
"Probably, flame brain!" Gray called over his shoulder.
"Can I stay here then?"
"NO!"
"Fine, I'm coming!" And they all set off in hopes of finding a town.