A/n: This is somewhat inspired by "Harry Potter giant growth" by .UWU on , although I'll be putting my own spin and a bit more detail (no offense if you're reading this). Also, this fic fill take place in second year. If you don't approve of growth scenes, scenes of nudity (maybe) and other stuff, don't read any further.
"'Mione, what are you doing with that tiny book?" Ron's voice echoed through the great library of Hogwarts, the school of Witchcraft and Wizardry.
This question was of course directed to this 'Mione, or Hermione Granger if you want her full name.
"No Ron, it's not a tiny book, not always anyway." Hermione answered, swishing her bushy brown hair away from her face. "It was shrunk to this size."
"Wait, there's a-" Harry's voice called out by Ron's, sitting beside him, but Hermione cut him off.
"Yes Harry, there's a spell that grows or shrinks things." Hermione interjected, slightly exasperated. "Seriously you to, how can you not know this?"
"Maybe because you read books way past our level." Harry and Ron found themselves mumbling.
"What was that?" Hermione growled, her eye twitching.
"N-nothing!" Ron stuttered.
"Now, do you want to see the spell or not?" Hermione asked.
"Sure do!" Harry exclaimed with excitement, only to be shushed by the librarian Madam Irma Pince.
"What're we waiting for?" Ron asked. "Let's go to the forest."
With that, the trio stood from their seats and left for the forest outside of the grounds.
When they got to the forest, Hermione turned around, the now resized book in hand.
"Well?" Ron prompted after a small silence. "Are you going to show us or not?"
"Be patient Ron." Hermione huffed. "The spell is simple..."
Both preteens looked on to Hermione closer, their attention focused on her (aka Harry's was, Ron wasn't really interested too much).
"All you have to do is move your wand in an S shape if you want to shrink something..." She demonstrated with her wand. "And grow something by moving your wand like a G." She demonstrated again but flicking her wand in a G shape this time.
"Now you can show us how it works Hermione." Harry exclaimed, a curious glint in his eye.
Hermione nodded as she raised the book in her hand and cast, "Shrinkus!"
Harry and Ron watched before their very eyes as the book began to slowly shrink as it shrunk further and further until it comfortably sat in the entirety of Hermione's palm.
"Woah!" Harry gasped, his eyes staring at the now shrunken book, while Ron looked disinterested. He'd seen cooler stuff than this done by his brothers, so he wasn't all that surprised and in awe at the sight. "That's amazing!"
Hermione preened at her ego being stroked as she points her wand to grow it back, "Growkus!"
Suddenly however, as soon as the words were about to leave her mouth, a niffler had come running out and grabbed the book, causing Hermione to shriek in surprise as her spell invisibly spiralled into another direction, aka Harry.
Unfortunately, however, this was not a spell that could be felt nor seen, so when Harry took the spell, he did not notice.
Ron took the initiative and proceeded to boot the creature away from Hermione as she clutched the book tightly in her hand.
After the attack from Ron, it scuttled away.
"Are you alright Hermione?" Harry asked worriedly.
"No worries, it just spooked me is all." Hermione replied with a smile.
"Let's get back to the castle before another one tries to nick something else, eh?" Ron brought up.
"Or some spiders were attracted to the noise."
"Ron's right on the first bit." Hermione nodded. "Let's get back before anything is actually stolen."
Harry nodded his head, but he couldn't help but feel that something was off somehow.
'Were my clothes always this tight?' Harry thought in confusion. 'This is pretty uncomfortable. I better be getting some new ones soon.'
Little did they know though, as they began to walk back, was that someone was watching from the side-lines, hidden by the trees.
They smirked as they began to walk off to the castle.
A/n: This is the first part done, I hope you enjoyed it. It has begun :)