Don't worry anyone who's been reading Cooking Lessons. I have not and will not give up on that story. If you've been following my facebook page you'll know that I needed a break from it, and I've found this story in my WIP folder. I have 20 chapters already written so I can update this story regularly while I write more to this and Cooking. Hopefully it will make up for the fact I haven't posted in a while.

Please let me know what you think. As it's such a short chapter, if you guys like it I'll post the next chapter tomorrow. After that it'll be a chapter a week.

The Prank

Chapter One

There was a knock on the dungeon door. Severus Snape looked up from his marking to see Harry Bloody Potter, the bane of his existence, was standing in the doorway.

"What do you want Potter." Snape spat injecting as much venom to his voice as possible.

"Um... Professor, can I have a word please?"

One week later.

"I have to go or I'll be late for my detention."

"I still can't believe you got a detention Harry. What on earth did you do?" Hermione asked looking up from her book.

Harry had an odd look crossed his face briefly. Too fast for either of his friends to identify. "I guess I asked for this one. I should go."

Harry trapeze down to corridors to his potions classroom and knocked confidently. The door opened revelling Professor Snape in his traditional long black teaching robes. "Ah, Mr Potter. On time for once. Well get in here. Let's get started.

One Hour Later.

A loud bang in the quite of the night woke most of the castle and the Bloody Baron was seen streaking through the castle, then returning with a running Albus Dumbledore following him.

Thirteen Hours Later.

Harry blinked, the sun was in his eyes. Sitting upright Harry saw he was in the infirmary. Madam Pomfrey bustled over. "Lie down now, and relax."

"Would you care to tell me exactly what is going on? And why can't I see properly?"

"I'll get your glasses."

"I don't wear glasses you foolish woman."

From another bed came a deep rich familiar voice. "Holy Shit."

"Language Severus." Admonished Madam Pomfrey.

"I did not use any foul language. And I can assure you if I were to do so I would be far more eloquent than that."

Madam Pomfrey drew back the curtain separating the two beds, and there was a loud gasp. "What's going on?" Severus asked.

Madam Pomfrey handed over a pair of glasses, when he put them on he looked up into the face of Severus Snape who was sitting on the edge of his bed swinging his legs grinning widely.

Harry's body flopped back into the pillows. "Bloody Fuck."

Madam Pomfrey turned to him. "Language... Um... Severus."

"I Apologise Poppy. But it's not every day you see yourself sitting on another bed grinning like a demented cat."

"I think I better go get Albus." Madam Pomfrey fled the room leaving the two men sitting there. The smile on Snape's face falling instantly.

"Hey, if you're meant to be me you're gonna have to keep the smiles up. If I can do it you can." Harry sat up. "You're doing pretty good though."

"And you Mr Potter have been practicing with long words."

Harry sniggered. "They'll be back soon. Back into character, or we'll be caught out before the end of day one."

Severus sighed before plastering a grin back onto his face. "Why did I agree to this again?"

"Because you can't say no to a challenge and you wanted to prove I couldn't get away with pretending to be you. But that no one would suspect you of pretending to be me."

"Oh yeah, that was it."

The doors of the infirmary were flung open and Hermione and Ron came bargaining in. Hermione catching Harry in a bear hug. "Unhand me this instant Miss Granger before I take away every house point from Gryffindor for the next two years."

Hermione paled, looking at the sneering face.

"Hiya Mione." Snape called from the next bed.

"Um... Professor Snape?"

Severus waved at them from his bed, grinning. "Sort of. Did I miss dinner?"

"Merlin's Shrunken Testacies. They've swapped." Ron said gapping from one to the other.

"Congratulations Mr Weasley I see you have not lost your perchance of stating the obvious."

Hermione looked from one to the other and after a moments indication she flung herself at Professor Snape and gave him a bear hug. Finally letting go she smiled up at her friend who was now much taller than her. "No you haven't missed dinner, but, will Madam Pomfrey let you out in time?"

"Of course she will Miss Granger. I will see to that." Came the voice of Albus Dumbledore from behind her. "Madam Pomfrey informs me, there is nothing physically wrong with either of them. Apart from the fact, they seem to have swapped minds. They are free to leave."