Without deviation from the norm...

Jen grabbed the rock from Karyn.
"That's no fair! I apologized! You know these wishes can't be undone!" she said.
"Walk around in these heels for a day and tell me how unfair it is," said Karyn. "Or fix it, if you're so damn smart."
"It was a mistake! I'm sorry! I wasn't thinking. We need to undo this somehow, and get me back to normal."
The two looked at each other in silence for a moment.
"You do look hot, though," said Jen.
"Right back atcha," said Karyn.
Jon looked at the stone for a moment, thinking.
"What if we wish that these school uniforms are a mistake, and will be replaced when we get to school by the regular uniforms?" asked Karyn.
"But these are the regular uniforms now," said Jen, sighing. "Maybe if we wish that they are being replaced this afternoon..."
"Good idea. But let's write down the wish so we don't screw things up even more." said Karyn.
Jen opened her little backpack and took out a notepad and a small blue pen. They talked and discussed the wording for a while, but soon realized they'd be late for school no matter what.
"I wish Karyn and I didn't have to go to school today because we have a legitimate written excuse that no one will question, and will not harm us in any way."
The stone flashed.
"Maybe we should get inside and work on this," said Karyn. "And change into something a little more comfortable."
Jen nodded. Soon, they were at Karyn's house. The two girls started up the stairs, Jen noting she could see Karyn's thong up the skirt. She felt herself get a little tingly. Once they got to Karyn's room, Karyn started peeling the clothes off. This only made Jen's tingle stronger. She looked down at her own sexy female body, squeezed into this schoolgirl costume... She shivered. Is this what it was like for girls?
Karyn turned around.
"Jon, erm, Jen... are you getting...?" she said.
"Can't help it," said Jen. She bit her lip and sat down on the bed. "Sorry. Wow, I'm... I feel really warm." Jen looked down and saw her nipples poking through her tiny top.
"Oh great," said Karyn, "I just turned my best friend into a horny lesbian."
The thought made Jen feel dampness between her legs. She crossed them, trying to get a hold of herself.
"Is it like this for girls?" asked Jen. "All the time? My God, I didn't know this kind of feeling was possible."
"Get a grip!" said Karyn, pulling on a reasonable bra and panties. She then slipped into a robe and walked over to her friend.
"Sometimes, yes, it hits you like that," she said,
"Karyn, seriously... I'm really burning right now," said Jen. She shifted on the bed. She could smell Karyn now. It was intoxicating. "This is... Oh God..." Jen fell back onto the bed. "Oh God, I want you, Karyn. I want you! I wish you would kiss me, touch me," she said. There was a flash.
Karyn gasped in shock, then felt intense arousal flood her system. She climbed onto the bed with Jen and kissed her deeply, touched her sensitive breasts, making Jen moan. Then Karyn pulled back. The arousal started to fade.
"Jon! Stop it! You're scaring me! Give me the stone before you say something else!"
She couldn't hear Karyn. Jen was lost in her own arousal. She rolled over, dropping the stone on the floor. Karyn rushed over and grabbed it.
"I wish Jon was normal!" she said. It flashed.
Her friend was still humping the bed. She couldn't understand why, but it was starting to make her hot. She looked at the stone, then put it carefully down on her dresser before walking back over to her friend. Jen climbed up and pulled Karyn into a passionate kiss. Karyn felt hot and wet almost instantly. The two girls fell into kissing, touching, rubbing, teasing, on the bed. It was over an hour before finally, both girls had come, and lay panting next to each other in bed.
"Wow," said Jen. "Girls... are... awesome."
"Yeah," said Karyn. "I wasn't a lesbian, but after that... I think you turned me."
"You wished for me to be normal," said Jen, "Wishes can't be reversed. I think you just made horny lesbians the majority."
Karyn shivered at the thought. "I think we've officially lost control."
"Control sucks," said Jen. "Where's the stone?"
"Why?" said Karyn.
"I want to have some FUN!"