Thanks to:
Oliverlover
CrazyBoutEngland
Simplyslow
SashaBT245
Kit Merlot
Lala
TheJazz
stRawb3RRi3zform3
RandomSmirf13
Loving.wood
Marin
Selenes Song
Armr4sleep16
TooSweet4Words
Keiko
Swimgirl
Hathor Valerious

I'm so happy I still have all of your support!

A/N: ASA is the ingredient in Aspirin. I couldn't remember how to spell it, and I just wanted to get this chapter up. And there's swearing. Not much, but it's there.

Chapter Nine: Payback is a Bitch

HOSPITAL WING

Katie still stared at the page, unbelieving.

She looked up at Madam Pomfrey, hoping that she really was kidding.

"I said I wasn't kidding before, and I'm still not now," Pomfrey told Katie, as though reading her mind.

Katie turned back to the page, reading it over again.

The Commotion Potion
(A.k.a. Break up in a Bottle)

Need to get back at a lover who has done you wrong and already moved on? Tired of your current love and need to rid yourself of them? Well, use the commotion potion, and show them who is boss!

Katie read down the list of ingredients and the impressive steps it took to make it. She knew only an accomplished potion maker could pull this off. Her eyes slipped down to effects and side effects.

This potion will cause a sudden hatred of the partner by the recipient, eventually causing a break-up. A few drops are sufficient!

Side effects include:
-extreme mood swings
-hallucinations
-sleepiness that leads to very deep sleeps
-confusion
-headaches

Note – to curb the headaches, sometimes a headache cure is added.

"So I have my ulcer because the headache cure was added?" Katie asked and shut the book. It was frightening to look at.

"Yes. In the headache cure, an ingredient called ASA is used and too much of it can cause ulcers. Were you under any stress?" Madam Pomfrey asked.

"Yes, a lot of stress," Katie replied truthfully.

"Well that probably had its' part. You'll stay over night and I'll give you some medication in the morning before I release you."

"Thanks," Katie said and pulled the covers over her.

"Have a good night," Madam Pomfrey said and left Katie in peace.

Katie lay on her back, staring at the ceiling. She had a huge problem in front of her, and had no idea what to do. Severus found out that she and Oliver had played him for a fool, and wasn't taking it lightly.She just couldn't believe that he'd actually slipped that stupid potion! How immature. Now she had a damn ulcer from all of this!

She rubbed her eyes. She couldn't believe how stupid she had been for thinking that she could pull a fast one on Snape.

"What am I going to do?" Katie asked herself.

She shut her eyes, but opened them when she heard a soft knock on the window behind her.

She sat up and straightened her hair a little.

The knock was heard again.

She got up out of bed and looked out the window, where Oliver was looking at her questioningly, floating on his beloved broom.

She opened the window and Oliver flew in.

"So what the hell is wrong with you?" he asked coldly as he landed.

"I'm sorry Oliver, you don't…"

"… Don't understand?" he said looking at her harshly, "What don't I understand? The fact that you don't want to be with me anymore? That you just used me for sex? You know, you could have just told me you only wanted a fuck buddy, because then I wouldn't have got attached to you. Then I wouldn't be thinking about you constantly…"

"What?" Katie asked. She was confused...

"Don't look at me like you have no idea what's going on! You said that you didn't like me! You basically told me to fuck off when I offered to help you down here because you weren't feeling well!"

"Oliver, shut up! Snape poisoned me!"

"What?" Oliver said, outraged.

"He didn't really poison me, but he did slip this potion to me that screwed with my thoughts," Katie said and set her hands on his face.

Oliver's mouth gaped. "What?"

"He slipped me this 'Commotion Potion' stuff that made me want to break up with you," Katie said.

"That sounds ridiculous!" Oliver said, but pulled her into a rib breaking hug despite the ludicrous potion Katie had just mentioned.

"I know!" Katie said hugging Oliver back, "But here, look at this!"

Katie picked the book up off the nightstand and turned to the page.

Oliver sat down on Katie's bed and read the page silently.

"This is an actual potion?" Oliver asked to no one.

"It is," Katie said and sat down beside him.

"Isn't it illegal?" Oliver questioned.

"I don't think so, we'd have learned about it if it had been. And Madam Pomfrey would have mentioned if it were illegal. It's probably just frowned upon," Katie replied and set her head on Oliver's shoulder.

"I'm sorry baby," Oliver said and pulled Katie onto his lap.

"It's ok, you didn't know. I didn't even know," she replied and wrapped her arms around his neck.

"No, I didn't believe you when you said something was wrong. I should have believed you, I'm sorry," Oliver said and buried his face in Katie's shoulder. "And I'm sorry for overreacting just now."

"It's ok Oliver," Katie said, "I'm not mad at you."

"I love you Katie," he said softly and kissed her cheek, "I really love you."

"I know, I love you too," she said and held him closer.

"He's going to pay for this. I'm going to get him for this," Oliver said angrily.

"No, you're not. We're going to get him for this," Katie said, "We can't let him think that he's going to be able to push us around."

"But what should we do? I mean, we could get in a lot of trouble," Oliver said.

"No. I could easily get him in trouble. He knows it's too risky to get me in trouble. He could say that I used a love potion, but he's knows well enough that it leaves traces…," Katie stopped and thought for a moment.

"I have an idea," Oliver said.

"What is it?" Katie asked.

"We're going to have sex in his classroom and arrange it so he walks in on us."

"We can't do that! We'd get in trouble if anyone caught us!"

"I know, but it still be fun as hell," Oliver said with a grin.

Katie grinned back.

"I'll think about it," she said and kissed him.

"Or we could just do it right here…" Oliver said and laid back on the bed.

Katie giggled and pounced on top of him.

The bed made a loud metal 'clunk' noise and Katie and Oliver stopped for a brief second before erupting into silent giggles.

"I think Madam Pomfrey heard us!" Katie hissed as she stopped and listened.

"Me too, I'd better get my ass out of here," Oliver said and stood up as Katie got off him.

"Yeah, you should," Katie said and handed him his broom.

"I'll see you in the morning," he said and kissed her."

"Ok," she said and kissed him back.

"Think about the plan?"

"I'll think about it."

"I love you Katie."

"I love you too, Oliver. Now get out, I hear her door!"

"Bye babe!" he called and took off as Madam Pomfrey opened her door.

"What in the world are you doing up Miss Bell! I told you to get rest!" the Matron chastised.

"I couldn't sleep, so I was just looking out the window, getting a breath a fresh air," Katie replied and closed the window.

"Get back into bed. I don't want to be up again to tell you off."

"Alright. Sorry Madam," Katie said and crawled into bed.

"Good night again," she replied and walked off to her room.

Katie let out the giggles she'd been dying to let out from almost getting caught with Oliver.

THE NEXT MORNING

"So take these once a day, in the morning. They'll help the ulcer heal. Take these…" said Madam Pomfrey as she handed Katie another bottle of pills, "…after every meal, they'll help with any pain that will arise from the ulcer.

"Thanks Madam Pomfrey, but may I go now?" Katie asked.

"Oh, right, yes, you may. Have a good Sunday," she said and waved Katie off.

"You too!" Katie called back as she left the Hospital Wing.

"There you are!" Oliver said and grabbed Katie, causing her to yelp.

"You scared me!" Katie said and laughed.

"Sorry. I just wanted to come see you," he said and wrapped his arms around her.

"Thanks," Katie said and hugged him tightly.

"Sorry for almost getting you caught last night," Oliver spoke as he kissed the top of her head.

"Meh. It was pretty funny. I nearly died from trying to hold my laughter in," she replied and they started to walk back to the Common Room.

"I'm glad you didn't," Oliver said and paused. "Did you think about what I mentioned?"

"Yes, I did. But I'm still unsure about it," Katie said apprehensively.

"I know. But just think of the look on his face."

"I know, but it just seems like such a cheap way to get back at him."

"Well, we'll think of something then, ok?"

"Alright. Thanks for not forcing that on me."

MONDAY MORNING, GRYFFINDOR TABLE

"Morning sweetie," Oliver said and settled next to his girlfriend.

"Hey you. I didn't think you were ever going to get up," Katie said and kissed his cheek.

They settled into a comfortable silence and started eating.

Oliver looked up at the staff table and saw Snape looking at him quite vindictively.

He let out a snort and kissed Katie's cheek.

"Oliver, what was that for?" she asked with a smile.

"Just because," he replied and then kissed her ear.

"Oliver, don't do that… At least not here…" Katie said in a hoarse whisper.

"I know I shouldn't, but you just look so sexy… The way your eyes look when I do that…" Oliver whispered.

She blushed, smiled and looked away.

Oliver looked up at the table again. Snape was no longer looking at them, but looked as though he had forced himself to look away. His face seemed to have a bit more colour then usual.

"Shows you. Bastard," Oliver thought to himself.

"You know what Oliver?" Katie said, snapping Oliver out of his thoughts.

"What?" Oliver said.

"Let's do it."

"Do what?"

"The plan…" she said.

"Really?"

"Yes. He deserves it. I don't even care if he catches us; I just want to know that we had sex in his classroom."

LATER THAT NIGHT

"Ok, Oliver, I can't do this!" Katie hissed as they reached the dungeons.

"What do you mean you can't do this?" Oliver asked.

"I just can't, I don't want to."

"You said you did."

"I know what I said, but I change my mind."

"Fine, I can't force you. What should we do now?"

"I think you should meet me in my office to discuss what you're doing down here after curfew," an icy voice said from behind the two.

"Oh fuck!" Katie said and twirled around to face Severus Snape.

"No swearing. That'll be detention, this upcoming Friday evening. Anything you'd like to add, Wood?" he said, his voice and expression unfathomable.

Oliver shook his head silently.

"Good. In my office, now."

Katie had a sense of impending doom as she walked into Snape's office with Oliver by her side.

"What were you two doing down here?" Snape asked as he faced Katie and Oliver.

"We were coming to have sex in your classroom to get back at you," Katie answered, straight-faced and unafraid.

"Why would you be paying me back?" he asked, still unfathomable as ever.

"You poisoned her, you son of a bitch!" Oliver shouted.

"Detention for you as well. Saturday morning," Snape said, shooting daggers at Oliver.

"You did poison me though," Katie said.

"I did not."

"You did! I ended up in the Hospital Wing from that ridiculous potion you put in my food and my drinks!"

"I don't call that poisoning though. If I were to poison you, you'd be dead already."

"How could you? Why can't you just accept that I don't want to be with you anymore? I need someone my age, someone I can relate to!" Katie yelled.

Snape stood there, letting his eyes bore into Katie's. She immediately started to bottle her emotions so he couldn't read her.

"I'm not going to let you do that, Severus," Katie said severely.

"And I'm not going to let you do this to me. I will not be made a fool of!" Severus hissed to her.

He made to raise his wand, but Oliver was quicker.

"Stupefy!" Oliver yelled and a reddish light flashed, and when him and Katie looked down, Snape was out cold on the floor.

"Good one Oliver," Katie said, a hint of shock and amusement in her voice.

"Come on, let's go," Oliver said and grabbed Katie's wrist, "We can't be caught here."

"I know, but hold on," Katie said and Oliver let her wrist go.

She knelt down beside Snape's limp body. She drew her arm back and punched him hard in the face.

"Never mess with me again," she muttered and then pulled out her wand.

"Katie…" Oliver started.

"Shh! I need to concentrate!" Katie hissed and raised her wand.

Oliver backed off.

"Obliviate!" she said and then stood up. "There. He shouldn't remember seeing us down here, or giving us detention, or you knocking him out."

"Shouldn't?" Oliver asked nervously.

"Don't worry. I'm not stupid, I know it worked. Now let's go. I don't fancy being caught again."

And with that, they left.

A/N: Sorry that took so long! I hoped you enjoyed it.