Warning: This story features bondage.

Context: This is a short story written for Day 18 of Kinktober 2025 using the prompt words Tiny and Huge.

The keyhole of the heavy wooden door flashed bright yellow before it unlocked itself and slowly creaked open. A conical purple hat poked through, followed by the furtive face of blonde-haired witch-in-training.

I slipped inside, gently closing the door behind me. Mistress Marsha’s private study hummed and pulsed with activity. Beakers of colourful fluid fizzed, runestones glowed, a will-o'-the-wisp flickered inside a large glass specimen jar.

Marsha was a renowned witch of the academy, a leading expert in the field of potions. She’d tasked me and my fellow apprentices Alma, Yolanda and Braxton with a semester-long assignment to invent an original potion.

Competition between apprentices was intense, and I’d been lagging behind in my progress. So what better way to get a leg-up than to break into the Mistress' study and sneak a peek at her research! I’d surely find some promising ideas, maybe even impress the Mistress herself with my ‘intuition’ in pursuing similar concepts.

I perused the parchments on the finely-carved desk, filled with complex diagrams, experimental observations, and innovative grand designs. A tray held rare and exotic substances, including a glass vial with a tiny sphere suspended in turquoise liquid. I picked it up, eyed the orb within, and gave it a quizzical shake.

The sphere started fizzing a little. Then a lot. Then an awful lot! The whole vial was shaking violently!

“Oh shhhi-”

pop... BOOM!

I had sense enough to toss the vial away just before it exploded into a ball of blue flame. The explosion was smokeless and well contained, obliterating a beachball’s worth of space and not a millimetre further. It did however create a fairly powerful shockwave.

CRASHHHH!

I was thrown backwards, slamming hard into the mounted shelves on the back wall. I slumped to the floor amid a cacophony of splintering wood and shattering glass.

“Ughhhh......”

I was crumpled into a half-buried heap, surrounded by debris and coated in colourful dust and liquid and who knew what else from all the broken containers. Initial impact aside, I was fairly unhurt at least.

I couldn’t say the same for the rest of the study though. The place was in bits. The main desk had a spherical cross-section completely missing, with a few small blue flames lingering at the clean-cut edges.

As I tried with difficulty to sit up, I heard a noise above me. Glancing upwards, I saw one last shelf barely hanging onto the wall at a slant. A large flask of glowing green liquid was sliding down towards the lower edge above me.

“No... nononono!”

It hit the rim, tipped over, and spilled directly onto my face staring up at it.

“Aahhplthhhffff!”

It was slimy, sticky and it got all over me. In my hair, in my mouth, down my shirt. It made my skin tingle. Quite a lot actually.

SLAM!

Uh oh...

A woman in a dark-brown robe glided into the room, Mistress Marsha herself. She surveyed what remained of her study. She picked up a smouldering page of notes, with a curved segment missing, and tossed it aside with disgust. She turned her glaring eyes onto me. Though she seemed almost... confused more than angry?

“M... Mistress Marsha I can explain! i heard a bang and i came to investigate. there must have been someone else in here .... why are you getting bigger?”

Moreso, why was my voice getting higher pitched? Wait... I was shrinking! My robes bunched up around me as my body rapidly reduced in size within them. I couldn’t stop it! It thankfully stopped on its own after a while, my final size no bigger than a handspan.

Marsha flicked her fingers in my direction, and streams of red glowing string flew out from them. They descended around me, closed in on me, and ensnared me like a net. She leaned down and grabbed one long trailing string, lifting it into the air, with naked shrunken me hanging in front of her face. My arms were pinned and I couldn’t cover up.

“Fascinating.”

“m... mistress... i...”

“Hush Nina! You’ve made a real mess of things. But we may learn something from this yet. I’m calling a meeting with the others.”

“what? but mistress i'm not decent. can i at least g-mmmh!”

She flicked her pinky finger and a string with a small knot flicked up and stuffed up my mouth. I swung in the air helplessly as we left her study.

A short while later, Mistress, myself, and her three other regular-sized apprentices were gathered in a lecture hall. They were all gawking at my tiny naked twine-bound form on the table.

“Yo that’s wild!”

“Alma, please. As a result of Nina’s idiotic intrusion and mishap, there’s good news and bad news. The good news is she accidentally completed the size-changing potion I’ve been working on for months. The bad news is I don’t know exactly which parts of that mess were relevant components for the result.”

“Nina being a mess. What else is new?”

“Alma, shut up! Since it will take a long while to sift through the wreckage and test the potential missing ingredients, not to mention sourcing more now that they’ve all run out, you three will be tasked with Nina’s care until then.”

“What?!”

“This is actually a rare opportunity that you shouldn’t squander. You have a miniature test subject for your in-development potions. Running out of the rarer ingredients while experimenting is usually a bottleneck, but much less so much when you can test with smaller doses. That will be Nina’s punishment.”

With that, Mistress Marsha whooshed out of the door. My colleagues looked at each other, then at my scared little face.

“I guess we should take turns to...”

“Me first! Yoink!”

“mmmhh!”

Yolanda plucked me off the table and dashed off with her new squealing test subject in hand.

As Yolanda and Alma walked down the corridor towards their next seminar, Alma marvelled at the little object attached to Yolanda’s bag.

“So she’s actually floating all on her own?”

“Yep! No longer will levitation require constant magical exertion and focus. One potion and the effect is innate and long-lasting. The main problem I still need to solve is not letting her float off into the sky. Hence the ribbons. Isn’t that right Nina?”

“mmmmph!”

I was wrapped up very tightly in thin ribbons, with one long ribbon connecting my bound feet to Yolanda's bag. That ribbon was stretched taut, as I was levitating a foot above their heads. At least the ribbons covered me enough that I wasn’t technically naked, but I was still being paraded around in front of the academy wherever Yolanda went.

“I can’t wait for my turn to use her!”

I yelled into the ribbon cleave gag in desperation as Yolanda approached yet another doorway, somehow still oblivious to the fact that I was floating too high to pass under it cleanly.

“mmmmph!”

BONK!

Yolanda set her books onto a table, joining Alma in the library.

“Hey Alma. How did your latest mixture go? Finally get the invulnerability working?”

“I did! Nina’s pretty much resistant to all forms of pressure now without structural damage. A tiny unbreakable toy~”

“I thought you said you were doing an extended all-day test today. Gave up on it?”

Alma glanced around to make sure no-one was watching and motioned her friend closer with a grin. Yolanda scooted close, and was gobsmacked to see Alma pull her breeches down.

“Alma! What on earth are you doi...”

Her jaw dropped even further when Alma reached down into her panties, and pulled out a sweaty panting naked blonde.

“What better way to test endurance to pressure than by sitting on her all day! As a bonus it tests that suffocating isn’t an issue either.”

“.... alm-ma... please... n... no more....”

“Hush test subject. Back in you go!”

“n.... noooo... please doommmmhhh”

“Stop struggling so much if you don’t want to slip back and end up between my asscheeks. Again.”

Yolanda felt sympathy as Alma pulled her tight pants back up, muffling the tiny yell.

The three apprentices enjoyed the midday sun as they lunched together in the courtyard.

“So have you settled on a potion idea Braxton? You had like four different ideas last time I asked.”

“I have in fact! Mine is, drumroll please, hyper-virility.”

The two girls looked at their male quarter-orc companion with disbelief and derision.

“Uhm. Weird choice aside, how are you going to use Nina to test that? Sounds more like a guy thing.”

“It is. I don’t need to test it on Nina. I've already got an effective version with common ingredients.”

“Hogwash!”

He shrugged.

“So what are you doing with her then?”

“You know those specimen jars? I just leave her in one of those in my room.”

“What? That’s a bit cruel.”

“That’s rich coming from you Alma after your treatment of her. Besides she has plenty of-”

At that moment their conversation was interrupted by a loud bang at the far side of the courtyard. Two young witches were having a public spat. One had just disarmed the other and was levitating the conquered girl into the air. She was flipped upside-down and floated up against a tall lamppost.

As everyone watched, the floating girl’s robes were torn from her body and shredded into strips. All except her underwear which shot straight into her mouth. The strips wrapped around her limbs and the pole tightly, leaving her naked, gagged, and pole-tied upside-down. The finishing touch was two small rods enchanted to vibrate endlessly that hovered up and descended into her. Her panty-gagged moans of anguish and pleasure echoed throughout the courtyard.

“You can stay there up there overnight!"

Braxton suddenly stood up, a flush on his face.

“Hm? You ok there buddy?”

“I... need to go. It’s uhhh... Nina’s feeding time.”

He ignored their confused faces as he hurried off, pulling out a strange white potion on the way.

“What was that about?”

“Probably better to not ask.”

Marsha and the trio stood around me in a large training hall. Marsha was adding the final touches to a flask of bright green liquid. At last, the resizing potion was ready.

“Back up everyone. There’s always a slim chance this will literally explore in our faces.”

“what?!”

Mistress tipped the flask over me, drenching me in the entire contents. A few seconds later, I felt that familiar tingle from the first time. It was working! I was growing! Marsha beamed at the success, but then her smile vanished.

“i’m growing back! This is such a relief. You've no idea how bad that w-...?”

“Everyone out! Get out of the hall!”

“Huh? Why woN’T IT STOP?”

My continuously enlarging body was getting close to the ceiling. I laid flat, scrambling towards the door that the others had already sprinted out of. I barely got my head through the doorway before it became too big.

“AAGH! OH... I THINK IT STOPPED.”

My head was stuck sticking out of the room. The rest of me was cramped but stable inside the hall. I wriggled around but the walls were too sturdy for me to break.

“I guess the balance was off. I’m going to have to brew a new batch. Since your volume is much greater, it’s going to take much longer. You should get comfortable Nina. This could take a few weeks.”

“WHAT?!”

“Hey... where’s Alma?” Yolanda wondered.

I suddenly realised there was something, or rather someone, squirming beneath my naked crotch in the hall.

Marsha groaned. “Ugh, did she not make it out? You two think of some way to retrieve her. I have other matters to attend to.”

Yolanda smirked. “This is a really big problem huh~?”

“... I HATE YOU GUYS SO MUCH.”