You were Rosalind Potter, being Harry Potter's sister was a bit exhausting wen Harry first came to Hogwarts when you were in third year but you passed by it. Your bestfriends were the Weasley Twins since first year, Fred and George, both of them being pranksters and you were one too.

One day, in sixth year, you got caught by the Weasley Twins in the courtyard while it was snowing because you wanted to leave Hogwarts to find something in a shop at Hogsmeade with the invisibility cloak but got caught by your bestfriends.

"Now Rosalind, come and join the big boys."

They say at the same time as they put you on the stairs and you stand on the stairs and remove your invisibility cloak, annoyed.

"What are you doing?!" You said and they quickly shushed you while Fred give you a Map and look around to see if someone heard you.

"What's this rubbish?" You said, holding the ordinary map, and Fred scoff and look at George.

""What's this rubbish" she says." Fred said a little bit amused then turned back to you.

"That there, is the secret to our success." Fred said with a small grin in he corner of his lips and then George spoke.

"It's a wrench giving it to you, believe me." George added after his twin with a smile and Fred spoke next.

"But we've decided, your needs are greater than ours. George, if you will."

Fred said to George and George nod, taking out his wand and point the Map in your hands.

"I Solemnly Swear That I Am Up To No Good."

George said the secret spell you didn't know the existence then letters stars to appears on the Map and you read.

"Messrs. Moony, Wormtail, Padfoot and Prongs.. are proud to present the Marauder's Map."

You read out loud and look back at them with a frown. George, seeing your confused frown, spoke.

"We owe them so much."

George said and you then open the Map, seeing many things and lines creating some familiar spot and you said:

"Hang on. This is Hogwarts. And that... no. Is that really-"

"Dumbledore."

Fred cut you off with a grin and George continue.

"In his study."

George said and Fred finish.

"Pacing. Does that a lot."

Fred said, his smile still there and you looked at them and then at the map while saying:

"So you mean this map shows-"

They cut you off again.

"Everyone." They both said and you then said.

"Everyone?"

You asked and they then speaks, finishing the sentences of eachother.

"Everyone."

"Where they are."

"What they're doing."

"Every minute."

"Of every day."

The Twins said, finishing their sentences like true twins. You then look at them, excited and with a smile.

"Brilliant! Where'd you get it?"

Fred smiled more and crosses his arms smugly.

"Nicked it from Filch's office, of course. First year."

Fred said and you were a but offended that they didn't tell you about their new fiding and George speaks next.

"Now listen, there are 7 secret passageways out of the castle. We'd recommend.."

George started, knowing where you wanted to go as they both point to a passage on the Map.

"This one."

They say in unison. George speaks.

"The One-Eyed Witch passageways. It will lead you straight to Honeyduke's collar."

Fred then added.

"But you best hurry. Filch is heading this way."

George then added something too.

"Oh, and Rosalind, don't forget. When you're done, just give it a tap and say, 'Mischief Managed'. Otherwise anyone can read it."

They say the last sentence in unison and they were happy that you were excited like them and that they finally let you know what they found in first year.