A/N: This is a sequel to my story "Hogwart's Hidden Swimming Pool." It does not need to be read first, but it might make more sense if you read it first.

Disclaimer: I do not own Harry Potter, nor any of it's wonderful characters, it all belongs to J.K. Rowling

Prologue

Fred sat in the Gryffindor common room with his twin George, once again trying to plot a prank. Their last one, which succeeded in getting their brother Ron and Hermione together, had, as Ginny put it, "unexpected consequences." Oh yes, they got Ron and Hermione together alright, by introducing them to their newly discovered hidden swimming pool in the Room of Requirement, but the plan had also managed to get their baby sister Ginny together with none other than the famous Harry Potter.

Now this, this would not do for Fred and George. They couldn't let their baby sister date a guy, especially one a year older than her!

But, unfortunately what had happened, happened, and it was time to let it go, right? Wrong! Maybe they couldn't break them up, but, as they had promised to Harry when they found out, he would regret the day he ever snogged their sister!

Just, how would they make him regret it? That was what Fred was thinking about on this dreary afternoon.

"Any ideas George?" he asked hopefully.

"Tons," said George, "but I don't know what to use on Harry, I mean we have dungbombs, charmed water balloons, and lots more, but I don't know which is good enough."

"George your brilliant!" Fred exclaimed.

"Why yes, I know," said George, "but what did I say to make you realize this, dear brother?"

"Well," said Fred, "you have tons of ideas, right?"

George nodded.

"So," Fred continued, "who says this has to be one prank? How about the never-ending parade of ruining Harry's life?"

George laughed, "Inspired, my dear brother. But Harry's an okay bloke if you get past his snogging of our baby sister. How about we just stick to the never-ending parade of ruining everything in Harry's life that has to do with our baby sister?"

"Brilliant," said Fred, "Where do we start?"

"Hmm," said George, pondering this, "I believe a trip to Zonko's is in store."

Fred grinned deviously, "and we can introduce some of our own products as well."

George beamed at his brother, "Harry won't know what hit him."