The Potion Mistress & the Half-Blood Prince

Chapter 17: Advance Potion Making

Disclaimer: I do not own any of the people or places that belong to the wonderful world of Harry Potter, as they belong to J.K. Rowling. The OC (Katherine) is entirely my own.

Severus felt like he had to wait forever for the boy to return. After he had vanished the water on the floor, he turned his wand on himself and vanished the blood and water from his on robes.

Once he was finished, he looked to the doorway again and finally saw Harry standing there, with book bag in hand.

"I didn't mean for that to happen," Harry Potter blurted out. "I didn't know what the spell was suppose to do."

"Who would have thought that the Chosen One would have known such Dark Magic?" Severus spat, ignoring Harry's statement all together. "I'll ask again. Who taught you that spell?"

"A...a library book," Harry stuttered.

"Give me your book bag," Severus command, as he held out a hand to receive it. Harry silently handed it over, and watched as Severus extracted each book, one by one, and examine them.

As Severus pulled out the "Advanced Potion Making" textbook, he began to look it over carefully. He flipped through the pages slowly and then flipped back to the inside cover.

"Is this your copy of Advanced Potion Making, Potter?" Severus scowled at the boy.

"Yes."

"Are you positive Potter?" Severus sneered. He noticed that Harry was breathing harder than normal, and suspected that it wasn't from running all the way from the common room.

"Yes."

"You purchased this textbook from Flourish and Blotts?"

"Yes," the boy said more firmly.

"Then tell me why it has the name 'Roonil Wazlib' written in its' inside cover?" Severus sneered. He now knew that the boy was surely lying to him.

"It's my nickname," Harry said quickly.

"Do you what to know what I think, Potter?" Severus sneered more. "I think that you are a liar...and a cheat. You will serve detention with me every Saturday until the end of term. Is that clear?"

"But sir, I have Quidditch," Harry protested.

"Then they'll just have to lose without you," Severus smirked as he walked towards the door. "Ten o'clock, in my office."

..................

After Severus had left the boys' lavatory, he headed straight for the hospital wing, where he found Katherine sitting at Draco bedside. The boy seemed to be asleep as Severus walked up to stand beside Katherine's sitting form.

"So," Katherine said, looking up at him. "What happened?"

"I believe that Potter has my old potions textbook," Severus said quietly, as he summoned a chair so he could sit beside the bed.

"That's impossible Sev," Katherine shook her head. "You said you destroyed that book when we graduated."

"I said I was going to," Severus said a little louder; his anger starting to grow. "I never got the chance remember. Potter and Black stole my book bag with one week left of school and it was the only book I never got back."

"So where is the book now?" Katherine rose a questionable eyebrow in Severus' direction.

"I don't know," Severus muttered, as he fell back in his chair and crossed his arms. "Obviously the boy has hidden it, because he had someone else's potion book in his bag."