Y/N's POV

A month passed quickly, me and Hermione worked on the Potion whenever possible whilst Harry and Ron used Harry's invisibility cloak to steal some ingredients.

When the Potion was finally ready, it was Christmas and we were all sitting down, enjoying our Christmas dinner. Everything that had happened seemed to be forgotten as all four of us enjoyed our Christmas together.

Earlier, the four of us had opened our Christmas presents together. I was happy with my presents, I gave away some of my spare chocolate and sweets to Ron, Harry and Hermione.

Hermione was happy with the gift I got her, it was an enchanted bookmark. I didn't know where I found it but when I saw it, I thought it was a great gift. Hermione herself had gotten me some Quidditch accessories and some Muggle sweets, which I appreciated very much.

Me, Harry and Ron had barely finished our third helpings of Christmas pudding when Hermione ushered us out of the hall to finalise our plans for the evening.

"We still need a bit of the people you're changing into," said Hermione matter of factly, "and obviously, it'll be best if you can get something of Crabbe's and Goyle's, they're Malfoy's best friends-"

"His only friends." I chuckled.

"-he'll tell them anything. And we also need to make sure the real Crabbe and Goyle can't burst in on us while we're interrogating him."

"Luckily, I came up with a genius idea." I said, before producing two cupcakes. "I've filled these with a simple Sleeping Draught. All you have to do is make sure Crabbe and Goyle find them. You know how greedy they are, they're bound to eat them. Once they're asleep, pull out a few of their hairs and hide them in a broom closet."

Harry and Ron looked incredulously at each other.

"Y/N, I don't think-"

"That could go seriously wrong-"

I opened my mouth but Hermione cut me off.

"The Potion will be useless without Crabbe's and Goyle's hair," Hermione said sternly, "you do want to investigate Malfoy, don't you?"

"Oh, all right, all right," said Harry, "but what about you and Y/N? Whose hair are you two ripping out?"

"I've already got mine!" said Hermione brightly, pulling a tiny bottle out of her pocket and showing them the single hair inside it. "Remember how Millicent Bulstrode was partnered with me at the Duelling Club? She left this on my robes when she was trying to strangle me! And she's gone home for Christmas, so I'll just have to tell the Slytherins I've decided to come back."

"What about you Y/N?" Ron asked.

"Um...truthfully I don't have any. I was planning on just staying in the bathrooms." I said sheepishly. "We don't have enough anyway."

Harry and Ron looked furious, but luckily I got away with it and was allowed to stay in the toilets.

Third Person POV

When Hermione and Y/N had ran off to check on the Polyjuice Potion again, Ron turned to Harry and they were both wondering whether the plan would fail.

To both boys' amazement, stage one of the operation went just as smoothly as Hermione and Y/N had said. They lurked in the deserted entrance hall after Christmas dinner, waiting for Crabbe and Goyle. Harry had perched the chocolate cakes on the end of the banisters. When they spotted Crabbe and Goyle coming out of the Great Hall, Harry and Ron hid quickly behind a suit of armour next to the front door.

"How thick can you get?" Ron whispered ecstatically as Crabbe gleefully pointed out the cakes to Goyle and grabbed them. Grinning stupidly, they stuffed the cakes whole into their mouths. For a moment, both of them chewed greedily. Then, without the smallest change of expression, they both fell over backwards onto the floor.

By far the hardest part was hiding them in the closet across the hall. Once they were safely stowed among the buckets and mops, Harry yanked out a couple of Goyle's hairs whilst Ron pulled out several of Crabbe's. They also stole their shoes, because their own were far too small for Crabbe and Goyle-size feet. Then, still stunned at what they had just done, they sprinted up to Moaning Myrtle's bathroom.

"Did you get them?" Hermione asked.

Harry showed her Goyle's hair.

"Good. And I sneaked these spare robes out of the laundry," Y/N then said, holding up a small sack, "you'll need bigger sizes once you're Crabbe and Goyle."

The four of them stared into the cauldron. Close up, the Potion looked like thick, dark mud.

"I'm sure me and Y/N have done everything right," said Hermione, nervously re-reading the page, "it looks like the book says it should...once we've drunk it, we'll have exactly an hour before we change back into ourselves."

"Now what?" Ron whispered.

"We separate it into three glasses and add the hairs."

Y/N's POV

I ladled three large portions of the potion in each of the three glasses. "Time to add your hairs."

All three of them added their hairs.

I then spoke. "I would recommend you changing into your robes beforehand since once you change it'll be harder."

"Good idea," said Hermione, "we'll take seperate stalls."

Harry, Ron and Hermione each went into a stall whilst I waited. Soon after they had each consumed the potion, Harry and Ron came out of their stall, the difference was that they were now Crabbe and Goyle.

"Holy crap guys..." I said, shocked, "this is unreal."

"This is unbelievable," said Ron, "unbelievable."

"We'd better get going," said Harry, "we've still got to find out where the Slytherin Common Room is. I only hope we can find someone to follow..."

"Hey Hermione, are you ready?" I asked.

"I-I don't think I'm going to come after all. Harry and Ron, go on without me."

"Hermione, we know Millicent Bulstrode's ugly, no one's going to know it's you-" Ron said.

"No, really, I don't think I'll come. You two hurry up, you're wasting time-"

"Hermione, are you ok?" Harry asked concernedly.

I looked at my watch, five minutes of the sixty we had passed.

"You two go, I'll check on Hermione." I said. The other two nodded and made their way out.

"'Mione, are you ok?" I asked, standing right outside her stall.

Just then Moaning Myrtle appeared. "Ooooh, you don't want to see her, it's real bad."

I waved her off. "Can you just come out?"

"The Polyjuice Potion only works with human hair...not animal. Turns out the hair I got wasn't actually Millicent's. It was her cat's."

I gulped, Hermione had transformed into a cat. Before I could say anything, the lock clicked and Hermione walked out, her face was covered in black fur. Her eyes had turned yellow and there were long, pointed ears poking through her hair.

I couldn't help but chuckled slightly, I then stopped when I saw Hermione's sad expression. "Cheer up 'Mione, when Harry and Ron get back we'll take you to Madam Pomfrey."

The two of us ended up sitting together, talking.

"You would make a pretty cute cat." I said accidentally, realising what I said, I cursed internally and blushed furiously. Luckily, Harry and Ron had come back.

"It's not Malfoy." Harry said sadly.

"And I was so sure it was him" Ron groaned. When the two of them saw Hermione, they were shocked but I told them to stay silent.

We took her to the Hospital Wing where she remained for several weeks. There was a flurry of rumours about her disappearance when the rest of the school arrived back from their Christmas holidays because of course everyone thought that she had been attacked.

I visited her every evening, bringing her homework when lessons started again. Sometimes I would be alone, other times I would be with Harry and Ron. Either way, I just came every single evening until she was well enough to leave.