Starlight Glimmer: The Mane One

Altering the minds of ponies was one thing, Starlight found plenty of spells for that, but nobody had truly figured out how to look inside a pony's thoughts before. Failing to find any memory-viewing spells, she decided to look for possible spell combinations.

"Hmm," she thought to herself aloud. "A morphing spell DOES allow you to link thoughts and memories on touch if you cast it weakly, but I don't want strangers to realize I'm touching them just to get to know their thoughts. That's just weird. Maybe if I combine a tiny morphing spell with a phase-through spell I can make contact with the stranger without them feeling it, so I can see what kind of boundaries they have before I even start the conversation!" She bookmarked the two pages, giggling to herself as she prepared a new empty scroll to write down a combined version of the two spells. "Starlight", she congratulated herself, "You're a genius."

She didn't hesitate to write down the new spell with the nearby ink and feather on the table. Finishing, she decided the name of her new spell and wrote it at the top of the scroll. "Memory-viewing on touch spell, cast as weakly as possible only." Starlight held her new powerful scroll out proudly. All she had to do now was test it.

She kept the scroll on the table and rushed through the castle hallways to get Twilight. The door to the map room burst open revealing an overconfident Starlight, her mane slightly spiked from her sprinting. "Twilight, I think I've got it now, let's try it again!"
Twilight looked up from the large circular desk, surprised. "Of course." She levitated her book under her royal seat, standing up and following Starlight into the castle library.

"I see you've been busy," she giggled, commenting on the pile of books and scroll on the large reading desk. She turned around, preparing the 'stranger' disguise from before. Meanwhile, Starlight looked at her scroll quickly, memorizing the two spells as well as possible. She began to cast it, when suddenly the library door burst open. Starlight gasped in surprise, causing a surge of magic to get used up in casting the experimental spell, losing control and casting it on herself fully. The rest of the main six flooded into the room with party blowers and confetti, Pinkie Pie rolling in with a big purple and light-blue cake on a trolley in the color of Starlight's hair.

"Happy birthday Starlight!" They yelled. Starlight blushed, absolutely confused. She had gotten so focused on her studies she had forgotten it was her birthday!
Fluttershy spoke up gently, "we wanted to uhm, surprise you by doing this in one of Twilight's lessons. We asked her permission and she said yes..." They all giggled, and Twilight set her costume back on it's coat hangar. None of them had noticed Starlight casting the spell on herself, and Starlight was so surprised she even forgot about it herself.

"I knew this was going to be a stressful lesson for you, Starlight" Twilight explained, "so we don't have to finish it today. It's your birthday after all, let's celebrate!"

Starlight blushed in her corner, forgetting about her magic spell entirely. "Aww, girls, I totally forgot today was my birthday. You're all way too kind..." Rarity had levitated a lovely chair behind Starlight, letting her sit down to take it all in.

"We're always there for you, darling." Rarity commented, "It was Pinkie's idea, really. We're just so glad to make you feel at home here."

"Yeah!" Pinkie Pie blurted out, "remember when I asked you when your birthday was?"

"That was ages ago!" Starlight said in amazement. "I can't believe you've done this for me. All of you. You're all the best, really. I feel happy. I could just.. I..." She smiled and began to cry happily with her hooves near her face at this friendship overload.

"D'awww" everyone cooed, approaching and surrounding Starlight Glimmer for a big group hug, wrapping their arms all around her.

But their arms didn't stop there. They all suddenly panicked as they felt themselves fall forwards into each other, phasing through Starlight's body. Laughter turned to confusion and terror as they all vanished into Starlight's body. Starlight looked around, horrified, having no idea where her friends went. The chair broke under her suddenly, making her realize that her whole body was getting bigger. She rushed aimlessly in the room, desperately trying to find the scroll to try and reverse it. The room became smaller and smaller to her, accidentally crushing the big table under her hooves in panic. She could hear her friends screaming but she couldn't figure out from where. Suddenly her growth spurt caused her to hit her head with the roof, everything suddenly fading to black followed by a massive crash.