School Infirmary.

"Madam Pomfrey, I've come to visit Miss Hermione Granger," Felix said.

"Oh, her." Madam Pomfrey grumbled at him, "Little wizards are so capable of getting into trouble these days, abusing magical potions without a shred of fear ... The way she's behaving, she'll be in the hospital for at least three weeks."

Felix asked with interest, "Can you identify what kind of potion caused this effect?"

"It should be a polyjuice potion mixed with cat hair, it's ridiculous, and I don't know where they found the potion from." Madam Pomfrey said as she poured half a cup of potion from the large bottle, "It startled me when those two little wizards brought her over Christmas night, I almost thought it was irreversible enchanted damage."

"Polyjuice Po ..." Felix chewed on the word, and after a few seconds he said gently to Madam Pomfrey, "Madam, let me bring her the potion on my way."

Felix pushed open the door and walked into the ward.

The room contained seven or eight beds, but only one covered with a white curtain. As Felix approached, the curtain opened from the inside.

"Madam Pomfrey? You've come to deliver the remedy?"

A furry head poked out, hearing the voice none other than his own assistant.

Hermione and Felix's eyes met, and she froze for a moment.

"Ah!"

The little witch let out a scream and immediately shrank back, pulling the curtain shut so hard that the whole hospital bed shook violently.

But just a hurried glance, he had seen his assistant's current appearance.

Her face is covered with brown cat fur, which is mixed with her own hair, a few cat whiskers are scattered on either side of her face, her eyes have turned to ginger colour, and on her head, there are two erect pointed ears.

"Miss Hermione Granger, I heard about your ordeal from Potter and Weasley and came to visit you," Felix said with a stifled smile as he spoke in an undertone.

He waited quietly for a few seconds, and from the curtain came Hermione's shaky voice, "Hello, Professor."

"I brought your potion, and--" said Felix, "If you don't mind, I can take a look and try to see if I can be of a little help."

"Professor, are you saying ... you can fix my problem?" Hermione said in an expectant tone as she hid in the curtain.

Felix mentally still reproduced her look, he tried his best to maintain his cool and said, "All I can say is, I will try, your situation is quite rare."

Hermione opened the curtain a little, she looked up quickly at him, and then buried her face in her hands.

Felix placed the potion on a side table and carefully examined the young witch's appearance at the moment.

This is truly pretty rare, Polyjuice potions are inherently difficult to brew cuz of ingredients, and even Master Potionists don't have much stock of it, much less use it lightly - and the chances of something going wrong like this are even lower.

Hermione caught his probing look, and she asked in a whisper, "Professor, do you have a solution? Madame Pomfrey says that cases like mine are very troublesome and will take at least three weeks to heal."

"Well, it is a mistake in Polyjuice, isn't it?" Felix thought seriously, this situation is indeed difficult to solve.

He extended his wand and gently tapped it on Hermione's forehead, the tip emitting a ring of golden light.

The little witch's face did not change.

"Well, human transfiguration doesn't work, it may conflict with the effect of the magic potion ... fascinating, um, I mean, really troublesome. Well, let's try a few spells to see if the old ones work."

In Hermione's eyes, Professor Hap excitedly cast a spell, he also pulled out a parchment, in which the effects of various magic spells were recorded.

"This does not work!"

"This is somewhat useful, but it's not obvious."

"How about trying this one?"

Hermione looked at Felix with a dull look on her face, are you doing this to help me? I've seen right through you, Professor!

Finally, a rather out-of-the-ordinary magic spell worked.

The brown hair on her face quickly shed and disappeared, and her skin became fair and clean again. Hermione felt the change and touched her face, then grabbed a small mirror from under her pillow to examine it closely.

"Oh, my God." Hermione covered her mouth.

At the moment, her appearance has been greatly improved, the original face thick, lush brown hair disappeared most of it, but the cat whiskers, a pair of pointed ears on the head still stubbornly remained.

But this effect alone can make the heartbroken Hermione amazed.

"Professor, what kind of magic is this?"

"A kind of minor metamorphosis can fix some small imperfections on the body, of course, it is temporary, the magic effect can last about two hours or so," Felix explained.

"Is it Body Transfiguration?" Hermione thoughtfully exclaimed, she had planned to learn this spell, but at the moment she couldn't help but be a little disappointed, because body transfiguration is an extremely dangerous magic.

That most of the adult wizards won't even try to do it.

"You could say that, but it might not work as well as you think - it's rather limited in what it can fix, and keep in mind that this spell was invented by a vampire, and was originally used to simply cover up their fangs."

" Vampire?" Hermione asked with interest, her attitude livened up by the fact that a large part of the trouble plaguing her is resolved.

"Yes, in the Middle Age, vampires are literally hunted by everyone. And to hide in the crowd, they developed this magic. But if you ask me, it's simply not as effective as Body Transfiguration or Metamorphmagus. Basically, no one uses it now."

"Professor, I've heard that Metamorphmagus can change one's appearance at will?"

"Yeah," Felix gave her a look, "so you don't have to risk taking a Polyjuice potion."

Hermione lowered her head, and her pointed ears dropped over her head.

"Professor, I ..."

"You guys brewed the Polyjuice Potion in private, right? I mean you, Potter, and Weasley."

Hermione looked up at Professor Hap with a surprised look on her face.

"Yeah," Felix said absently, playing with his wand, "that's easy to guess, especially when I associate it with the fact that you once asked me specifically for information on particular potions, and I introduced a total of six types of potent potions, but you were obviously more interested in polyjuice Potion."

"Polyjuice Potion can change a person's appearance, and it is indeed possible to unwittingly siphon off information-"

"So, what I'm trying to figure out is, who is the target of your suspicions?" Felix looked at Hermione.

"Malfoy," Hermione whispered.. "We suspect him of being the heir to Slytherin."