Moondrop in Gym Class

"Ok, ladies! Dress out!" Professor Alluria called the class to order.
Flashing and spinning lights erupted all around Iona. Streams and ribbons of clothes flew through the air in some directions. On other girls, a ring sparkles progressed up their silhouetted bodies, leaving behind them fancy outfits. Most of the girls spun in one direction or another. Most also shouted out their "names."
Iona groaned. She hated having to dress out for gym. It was stupid. But there was nothing to do for it. She reached into her shoulder bag, and brought out Carlotta. Carlotta was a pygmy slow loris, stupid and giant-eyed. She had patchy brown and black fur. And she was the source of Iona's power.
Holding Carlotta in the palm of her hand, Iona heaved a last sigh, then called out, "Moondrop transform!"
She felt herself lift off the ground. Without actually choosing to, her arms spread to the side, fingers pointing outward. Her toes pointed below her, like a ballerina in toe shoes. Her clothes evaporated, turning into a million shrinking particles that scattered and sparkled. This was her least favorite part of the transformation, but having watched many other magical girls transform, she was pretty sure no one could see anything important between the the light show and her skin's crystalline appearance during the transformation. She had the impression she was turning in circles. It felt a little like it, at least, but she had a very difficult time opening her eyes during this process.
Carlotta floated in front of Iona for a instant, then flattened into a two-dimensional image of herself, which then stretched out till she became invisible, but Iona could still feel Carlotta wrapping around her.
Before Carlotta appeared as actual clothes, though, Iona felt the body changes. Her hair grew absurdly long, forming three trailing tails of hair. Her bust and hips widened while her waist narrowed. It wasn't by a lot, but it was noticeable. Then she felt the clothes appear, flashes of light brightened the darkness of her closed eyes and a splashing chime rang out as each item appeared. Shoes, stockings, gloves, skirt, top, bows and ribbons, two bracelets, a necklace, and a tiara.
It wasn't the same every time. Heck, the costume had never repeated, but Iona had gotten used enough to how it felt to know what was appearing.
Now she knew she was spinning. Her skirt spread out, and her hair tails flew out behind her. After a final burst of sound and a flash of light, Iona felt her feet touch the ground. Her hands crossed in front of her, and then one shot forward, hand in a fist, like she was punching something invisible. Her other hand, also in a fist, was at her side, ready to punch forward should occasion call for it. Her feet were in a ready stance, prepared to run or kick or... something.
"Mystical Twilight Duchess Moondrop!" she heard herself shout at the top of her lungs as her eyes finally opened.
There were oos and ahs and a few appreciative comments on her beauty. This embarrassed her beyond description, but she found herself, as always, unable to blush in costume. She was no longer, strictly speaking, Iona. She was Mystical Twilight Duchess Moondrop. And, of course, the whole class had watched. The average transformation time of magical girls rested somewhere south of thirty seconds. Moondrop's transformation always lasted exactly 2 minutes and 26 seconds. The others would be done and have nearly two whole minutes to watch her change.
She took a second to look at her costume this time.
"Fuck," she muttered.
The costume was incredibly impractical. It nearly always was. This time it was exceptionally so. Black, pink and red were the dominant colors. Her feet were inside a pair of pink over-the-knee boots with two-inch heels. Was that material leather? Her skirt was extremely short in front. So short she wondered if it covered her underwear. She noted that she was not wearing any kind of shorts underneath. She never did, but she always hoped. She supposed she should be grateful she had underwear. The skirt was red, with ruffling waves. The dress was much longer in back, almost forming a train. Diaphanous black tulle covered the skirt, which was hemmed with black, red, and pink bows. She decided to be grateful it covered her backside, though she wasn't entirely sure it didn't hug well enough she might as well be bare. The bare-shouldered bodice was pink, with a neckline diving so low it couldn't really be called a neckline. It dove between her breasts where it ended behind a gigantic red bow that sat just underneath her bust. The top wrapped around to her back, but her back was almost as bare as her shoulders. She was certain she could not identify what physics kept the top in place. The gloves were a match for the boots: pale pink and up over her elbows. They ruffled up her arms like the skirt and at the open end had their own trains that dangled back down to her wrists. Her left wrist sported what looked like a silver and pink diamond link bracelet. The right had silver bangles with rubies. Her necklace was a simple if sturdy silver chain that held up a large bloodstone. The tiara on her head probably sported something similar.
"You are so beautiful," an awed voice whispered. Moondrop looked up, startled by the comment. She met the eyes of Jade Summer Guardian. Moondrop was not the biggest fan of Jade, but was jealous of her. Jade not only had a reliable costume, it looked comfortable. She had a leather jacket (a deep green that was almost black, ripped denim pants, fingerless gloves, and a half tee. True, she had high-heeled boots too, but still. Of course the fashion wasn't what Moondrop would chose: rhinestones covered the jacket, the gloves had some kind of lacy fringe, the pants were embroidered, and the tee had a giant butterfly printed on it, but at least it wasn't... whatever Moondrop was wearing.
She learned long ago not to complain. The other girls, every single one, worshiped Moondrop's outfits. They wanted to be her so bad that they wouldn't stop making overtures to be her friend, no matter how mean Moondrop was. She saw that worship in Jade's eyes now. Moondrop gave her head a tiny shake before stopping herself. Just enough that one of her hair tails came into view. Of course her hair was pink. It had red, black, and pink ribbons running through it. She wagered the tails were tied off with bows as well.
She strode quietly toward the front of the class. Feeling like her ears and cheeks should be burning red. She tried to ignore a few other whispered comments of admiration.
Finally the professor quieted them all. "Rope climb!" Alluria shouted.
Moondrop's eyes went wide. "What the hell?" she screamed in her mind as their teacher explained the rules. They were not actually required to climb the rope. They just needed to retrieve the wand the professor had placed at the top of the rope, ten meters up. Ideally they would use whatever powers they had as magical girls. It was decidedly unfair, as several of the girls could fly, but there was no use in complaining about that. It was what it was.
"What it was" turned out to feel like being dropped in ice water when Moondrop was called to go first. She closed her eyes and groaned quietly as she stepped forward.
Professor Alluria held up a stopwatch and bellowed "GO!"
Moondrop could not fly. It would have been useful in the spirit busting she was called to do as a magical girl, but it was not a power any of her outfits had ever given her. Instead, at the shout Moondrop leaped into the air, each of her hands grabbing a bracelet and pulling it off her wrist. She caught the rope about half way up, and as she did so each bracelet changed shape to cover the palms of her hands and pads of her fingers, gripping the rope underneath them with ferocity. Moondrop hadn't known they were going to do that, but the one good thing about this job was she instinctively used whatever random powers came with each outfit.
The trains of material dangling from the gloves wrapped themselves around her biceps, and she felt her muscles strengthen. She began climbing hand over hand, moving upward with a speed she wouldn't have thought possible before Carlotta bonded with her. As it was, very little surprised her anymore. She reached the top, sat on the cross beam, which was only a few inches wide, and held up the wand she was sent to get.
Alluria stopped the timer. "Impressive!" she shouted. "But I didn't expect any less."
Then Moondrop noticed the other students again. They were gazing in rapt fascination. It ... felt like something different than just watching her climb the rope. A few of the girls were whispering to each other. Moondrop had almost expected cheers. They always seemed excited about everything she did. A couple were pointing excitedly.
In the whispers, Moondrop finally made out a single syllable. "Thong." She was confused for a moment before the horror smashed into her brain like it had been thrown against a brick wall. She hurried to try to cover herself from the viewers below, lost her balance, and fell.
There was a cacophony of shouts from the girls below, nearly all of them various magical girls summoning their powers.
"Chromium Metal Damage Reflection!" "Sunray Bounce!" "Sleepytime Comfort Pile!" "Domigirl Binding Capture" "Ice Princess Restraint!"
The first two powers fired off before Moondrop reached the ground. The net effect was Moondrop's skin started to reflect light, and she literally ricocheted off the floor and headed back upward. She was unharmed, though the ringing crack of the impact didn't lend any relief.
The third power brought into existence a rather large pile of pillows and plush animals on the floor under Moondrop. Moondrop had two simultaneous thoughts: first, that it actually did look pretty comfortable, and second, she wondered if she would still bounce off them.
Before she could find out, the fourth power took effect, and a leather mermaid harness bound her legs, attached to a leather strap which connected to the ceiling. Moondrop's descent was interrupted.
Then the fifth power encased Moondrop in a block of ice, and she blacked out.