That night, Arthur came to the Room of Requirement.
In his heart, he silently chanted: I need a place to brew potions.
After pacing back and forth three times, the door appeared and opened.
"As expected… right here."
Just as Arthur had guessed, this was where Hermione brewed her potions.
After all, aside from his Zen Garden, nowhere else in Hogwarts offered this level of secrecy.
Since the little witch was still sulking and refused to ask for his help, the only safe place left for her to work on her potion experiments was this room.
"Hm? What's this?"
Arthur noticed several cauldrons bubbling beside the Polyjuice Potion.
He picked up the potion notebook on the side and quickly skimmed through it.
One potion was a modified version of the Euphoria Elixir—a special Hallucinogenic Draught, which made everything the drinker saw appear bright and beautiful.
The other was an unfinished Gender-Change Potion, meant to temporarily switch one's sex.
Looking at the thick potion notebook in his hands, Arthur knew Hermione wouldn't have invested so much time and effort into these without a reason.
After all, she'd never been this passionate about Potions—certainly not compared to Transfiguration.
It wasn't hard to guess what these concoctions were for.
He thought for a moment, then picked up a quill and made a few corrections in the notebook—helping Hermione perfect both recipes.
The next morning, Hermione came to the Room of Requirement.
Seeing her potion notes had been tampered with, she was startled.
But when she looked closer, she immediately recognized the handwriting.
It was her cousin's.
Warmth filled her chest—she hadn't expected Arthur to be secretly looking after her like this.
He'd said he wouldn't get involved in her "plan," yet here he was, quietly helping from the shadows.
Smiling with delight, Hermione got to work, brewing with renewed enthusiasm.
On Halloween morning, Harry and Ron each received a peculiar invitation—from Nearly Headless Nick himself—inviting them to attend the ghosts' grand Halloween Banquet that night.
Intrigued, the two agreed to go.
At breakfast, while the boys weren't paying attention, Hermione slipped a few drops of her Hallucinogenic Draught into their milk.
For the rest of the day, Harry and Ron found the world to be utterly wonderful—everyone they met seemed to smile warmly at them, and even Draco Malfoy didn't look half as annoying.
Though professors noticed their constant goofy grins in class, since they weren't disrupting anything, no one bothered to intervene.
Only Snape noticed something was off—recognizing the effects of a joy-inducing potion. But when Arthur subtly signaled him with a glance, Snape decided not to interfere.
That night, the Great Hall buzzed with celebration. Yet, at the Gryffindor table, two familiar faces were missing.
"Where are Harry and Ron?" Arthur asked curiously.
"They're at another banquet," Hermione replied with a knowing smile.
The moment she said that, Arthur immediately understood.
So that's why she'd drugged them with the Hallucinogenic Draught—they'd gone to the ghosts' Halloween feast.
Hermione herself had once been invited by Nick the year before, but Arthur had stopped her—he knew ghostly cuisine wouldn't exactly suit the living.
"What, so they're eating ghost food right now?" Arthur asked, half amused.
"Mhm. Want to go have a look? I've got something even more exciting planned," Hermione teased, raising an eyebrow.
At that, Arthur remembered her other, unused potion—and grinned.
"Alright. Let's eat quickly."
The two finished their meal in haste and slipped out of the Great Hall.
Snape, noticing their hurried exit from the staff table, frowned slightly and followed.
The ghosts' Halloween banquet was being held in a disused classroom, transformed into a chillingly grand dining hall.
At least, that's what it should've looked like.
To Harry and Ron, under the effects of the potion, the hall gleamed with golden splendor.
Tables were laden with rich, delicious food—far better than anything Hogwarts had ever served.
The boys ate enthusiastically, surrounded by ghostly hosts.
From the doorway, Arthur and Hermione watched as Harry and Ron devoured what looked like grayish, translucent drumsticks.
Nearby, Nearly Headless Nick and the Fat Friar were whispering to each other in amazement.
"I never thought living students could enjoy our dishes so much!"
"Indeed! Others who've attended in the past always said our food tasted like candle wax."
"So tell me," Arthur interrupted curiously, "what exactly is ghost food made of?"
"Ah! Young wizard, you startled me!" Nick's head nearly slipped off from the shock.
"We… don't eat ordinary food," the Fat Friar explained. "Our recipes use ethereal ingredients. Most living folk say it's like chewing wax—and they usually get stomachaches afterward."
"I see," Arthur said with a smirk. He and Hermione exchanged a look, both trying not to laugh.
Just then, Snape's low voice sounded from behind them.
"So that's why those two were giggling all day. And now I don't see them at dinner."
"Professor Snape!" Hermione jumped, guilty as a kitten caught stealing treats.
Arthur, unsurprised, only smiled faintly—he'd noticed Snape following them earlier.
"Well," he said, "Hermione's modified version of the Euphoria Elixir clearly works. Those two are living in a world of bliss."
Snape gave a curt nod. "Effective enough. But honestly, it's not much different from the original elixir. Even the Weasley twins' pranks are more creative."
Arthur grinned. "Don't worry, Professor. The main act hasn't even started."
He turned to Hermione and gave her a subtle nod—time for the grand finale.
With Snape right there, it was too perfect.
Hermione grinned mischievously and pulled out two vials of Gender-Change Potion.
With a flick of her wand, the bottles floated silently over Harry and Ron's cups—and poured in their contents.
Moments later, the boys lifted their glasses and drank.
Almost immediately, their bodies began to change—frames shrinking, features softening, hair growing long and silky.
Within seconds, a pair of female versions of Harry Potter and Ron Weasley stood before the stunned onlookers.
Snape froze.
He ignored Ron entirely.
His gaze locked onto Harry—now looking exactly like a young Lily Evans.
"L–Lily…" he whispered, voice trembling.
If Harry as a boy resembled James with Lily's eyes… Then as a girl, she was Lily reborn.
Arthur coughed deliberately. "Professor Snape, a friendly reminder—you're a married man. And she's about thirteen."
He put particular emphasis on thirteen. Hermione nearly burst out laughing.
Snape's face turned scarlet. "Enough! When this is over, straight to your dormitories! And stop wandering the castle—or I'll deduct points from Gryffindor!"
Seeing Snape's embarrassment, Arthur quickly ushered Hermione away, both barely holding in their laughter.
Behind them, Snape stood staring at Harry's retreating figure, eyes full of longing before he finally tore himself away.
Meanwhile, Harry and Ron kept eating happily, blissfully unaware.
The next morning, the Gryffindor boys' dormitory echoed with two shrill screams.
"Harry! I think I'm a girl!"
"Me too!"
Panicked, the two touched themselves in disbelief.
Gone—something important was missing.
"W-what do we do? Don't tell me the ghosts' food turned us into girls?!" Ron squeaked.
Harry frowned. "No… wait. Don't you think we were acting strange yesterday?"
At that, Ron recalled how she'd thought Malfoy was nice and Snape looked kind.
They both shuddered.
"We must've been dosed with something," Harry muttered grimly.
"So what now?" Ron asked helplessly.
"Maybe we just… wait until it wears off?"
The two sat in despair, praying the effect wouldn't last forever.
Luckily, most of their dormmates were gone for breakfast—otherwise, they'd have died of embarrassment on the spot.
Unfortunately, Hermione's potion worked too well.
By the time class rolled around, they were still girls.
Left with no choice, the two wrapped themselves tightly in robes and scarves before sneaking off to Potions.
But all the layers took time—so they ended up late.
When they entered, only their eyes were visible.
Those who knew them guessed who they were; others might've mistaken them for a pair of masked bandits.
"Sorry, Professor—we're late," Harry mumbled, his voice noticeably higher and softer.
Snape took one look at them and instantly knew.
He smiled faintly—kindly, even. "That's fine. Just take your seats."
The Gryffindors stared in disbelief. Snape? Kind?
Then Snape's eyes shifted to Ron, and his tone turned icy.
"Miss Weasley—five points from Gryffindor."
At the back, Hermione was trembling against Arthur's shoulder, stifling laughter until her stomach hurt.
It was, without question, the funniest Potions class she'd ever attended.
Of course, while Snape wouldn't expose Harry, that didn't mean others wouldn't notice.
As soon as class ended, Draco Malfoy "accidentally" brushed past Harry—and yanked down her hood.
A delicate, beautiful face met his eyes.
For a moment, Draco's heart skipped a beat.
Then realization hit, and the blood drained from his face.
The rest of the class exploded in laughter.
Red-faced and flustered, Draco bolted from the room.
Moments later, Ron suffered the same fate—her disguise stripped away by her own housemates.
By the end of the day, the news that "Harry and Ron turned into girls" had spread through Hogwarts like wildfire.
Meanwhile, Snape had summoned Hermione and Arthur to his office.
"How long does your potion's effect last?" Snape asked, trying—and failing—to sound purely academic.
Hermione hesitated. "I… I don't know, Professor. My cousin helped me perfect the formula."
Snape turned to Arthur.
He shrugged. "Don't look at me. It was brewed and tested straight away—I've no idea how long it'll last."
"Show me the formula," Snape ordered.
Arthur coughed, rubbing his fingers together meaningfully.
The message was clear: that'll cost you.
After all, the recipe was Hermione's creation—he was merely the consultant.
And even a master potion-maker like Snape had to respect fair business.
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