I am Peter Pettigrew

Students at Hogwarts were not supposed to leave their dormitories after 10 p.m. but that has never stopped the Weasley twins from roaming about.

The brothers were holed up in one of the abandoned classrooms in a remote part of the castle they knew Filch, nor the prefects or the teachers visited during their night patrols.

"This new stink bomb is definitely going to make waves," said Fred.

"Waves of stinky Slytherin's throwing up, Haha" replied George giddily.

Both the brothers were squatting around a cauldron. Mixing the ingredients for their newest creation.

"Less gifted twin, would you check the map just in case filch decides to change up his patrol path??" asked George.

"Well yes I would my ugly twin" Fred replied. Taking out his wand from his pocket, he reached for the blank parchment placed on the table beside him.

They knew that they were safe but it never hurt to double check, especially since last year when they were found out by a sixth-year prefect from Ravenclaw randomly.

"I solemnly swear I'm up to no good" Fred tapped his wand on the map.

Ink started to spread out from where he had tapped the parchment. Taking the form of a map. The map showed Hogwarts along with all the people in it. Fred looked over it. Checking where Filch and most of the teachers were. Finally moving over to the part of the castle where they were hiding.

"The corridor is clear... wait who's Pet...."

"STUPEFY" a shout rang out inside the room.

A red beam of magic hit Fred, causing him to fall to the ground like a doll with its strings cut.

"FRED" George shouted for his brother. He looked up to see the end of a wand pointed in his direction.

"Stupefy" another red beam was shot and the second Weasley twin fell on the ground.

A short portly man in dirty clothes stood over the bodies of the two 15-year-olds.

The man has a pointed nose and small watery eyes. His hair is thin, colourless, and unkempt, with a noticeable bald patch.

"Stupefy, stupefy, stupefy, stupefy"

He hits the twins with two additional stunners each.

*

"Phew"

Taking a long breath, I try to calm myself down. I prod the teens with my feet. My wand still trained on their unconscious form.

Both of them are out for the count.

"Okay you can do this; you practiced the incantation and everything" I try to hype myself up.

Pointing the wand towards George.... or Fred I don't know nor care, I whisper the spell.

"Obliviate"

A green beam leaves my wand and hits the kid, removing their memory of the last hour. Now he will think he fell asleep while in the room whenever he wakes up. Along with that all his memories of the marauders map have been removed, he will never know it existed.

The same process is repeated for the other twin.

Finally done with clearing my tracks, I grab the map still clutched in the hands of one of the twins.

Quickly looking over it I watch where all the teachers and patrolling students are. Thankfully none have moved towards this part of the castle.

While in the room I'm in, there are three names on the map, George Weasley, Fred Weasley, and finally me Peter Pettigrew.

"Mischief managed" I utter, while tapping the map causing it to become blank.

I stuff the map into a pocket on my coat and will myself to turn into my Animagus form, the transformation is as smooth as it was the first time.

My form shrinks rapidly and I'm in the form of a mouse again. I scurry out of the room, running back where I have been hiding for the last week.

After a few minutes I arrive on the 7th floor of the castle, opposite a portrait of a man teaching troll's ballet.

I walk across the wall opposite the portrait 3 times thinking about what I want. A small rat sized door appears in front of me and I move inside.

*

As I enter the room, I immediately turn back into my human form. The room is large enough to have a big four poster bed, study desk, sofas and an attached bathroom.

Falling onto the bed, I lie on my back, looking at the ceiling.

A big smile comes to my face, probably the first one since I was shoved in this body last week and wasn't that a roller coaster of a ride.

One minute, I'm in the middle of a bar fight, smashing a glass bottle on the head of the guy whose girl I was hitting on. The next minute, I'm in the world of Harry Potter, in the body of a rat in the Gryffindor 3rd year dormitory.

This body came along with all its memories and let me tell you, Peter was even worse than he was shown in the books or the movies. The amount of stuff he has done would easily qualify him for a dementors kiss in this world or the electric chair in my last. That is excluding betraying the Potters and killing 12 muggles in front of Sirius Black.

There were many families torn apart by Pettigrew, both magical and muggle. Rape, torture, murder, the list was long and some memories are even a bit disturbing for me.

I am not some white washed hero, even though I have my history of violence and aggressiveness towards both men and women, some of the memories of what Peter did to some young muggle girls is still disturbing to me.

Thank god he had the mind to cover his tracks or the people in this world would hate me even more.

The only positives of all the memories were a familiarity with the world and magic, thank God. I didn't want to go around trying to learn magic and be defenceless in the body of a criminal.

The first thing I did was leave the dormitory still in my Animagus form and find my way to the 7th floor. Pettigrew's memories didn't include the knowledge of the room of requirement but he was familiar with the painting of Barnabas the Barmy on the 7th floor. So, it was easy to find my way.

It is the start of Harry's 3rd year. Dementors were already prowling outside the castle.

I had spent the last 7 days in the room only leaving to find scraps of food.

I don't know if Ron had tried to find his pet rat, or if anyone else had tried to search for me. I didn't dare go near students or teachers out of fear to get caught.

My situation was a precarious one, on the one hand I have future knowledge which could potentially help others and bring down Voldemort, but on the other hand all those other people would very much throw me in Azkaban or outright kill me.

I even thought about coming clean and revealing my memories to Dumbledore or anyone else, but no one will believe any word coming out of the mouth of this body. I can't take that risk.

It took a whole day of thinking, trying to figure out how I could clear my name. Well, the world thought me dead at the hands of Sirius Black, who right now was out there trying to do just that.

I couldn't let Sirius catch me and reveal what I did to the Potters and him. I needed to catch him first and take care of him.

The next 6 days were spent trying to come up with a plan and familiarizing myself with magic, although I had the memories and experiences of performing magic as Peter, I couldn't take the risk of my magic not working when needed most.

The first step was acquiring the marauders map which I had just done. This will help me track the people in the castle and Sirius.

Thankfully it was still early in the year, the twins had not given the map to Harry yet. It was easy to track them in my rat form.

*

It was after another week, making sure that nobody had caught onto me, that I was confident enough to attempt the 2nd step of my plan, which was to acquire Harry Potters invisibility cloak.

The Weasley twins have gone about their days like nothings changed, no increased patrolling of teachers and perfects, things seem unchanged as far as I am concerned.

It was 10 a.m. right now and the dormitories would be empty as classes are going on. I made my way to the Gryffindor common room in my rat form.

It was so easy to move around the castle as a rat, Sirius and James may have had the flashy transformations as Animagus, but to be inconspicuous as I wanted to be, a rat was the best choice, well maybe a flying insect like Rita Skeeters beetle would be better but still I'm happy with what I have.

Reaching the common room, I saw the door was open as a gaggle of students made their way out. Scurrying inside I made my way to the 3rd year dormitory.

Reaching inside I checked if the room was empty which it was. I quickly changed into my human form, closed the door and took out my wand.

"Colloportus" I tapped the door with the wand, locking it. Quickly making my way to Harry's bed, I searched the trunk at the foot of his bed and voila, there it was. One of the legendary deathly hallows. The material was like liquid silk slipping over my hands and despite how old this cloak was it still felt good as new.

Peter had used this cloak a lot during his school years along with James, Sirius and Lupin, thinking it was a common invisibility cloak.

I pulled the cloak around myself, covering myself completely.

"Silencio" I cast the spell on my boots so no sounds are made. 

I make my way out of the common room going back to my 7th floor hideout.

*

It's been another week since I raided Harry Potter's trunk, heh. Harry had been concerned about his lost cloak and had asked around to no avail. Even McGonagall and Dumbledore had conducted a investigation of the matter but couldn't find anything. I was holed up in the room of requirement where no one could find me.

I don't know what Dumbledore's reaction was to find that a deathly hallow has been lost or stolen. I can only keep myself out of his eyes and thoughts.

I had been keeping up practicing my magic and what a thought it was, I have MAGIC. From my memories I know that Peter is weak compared to a majority of others. Only being comparable to someone in sixth or seventh year in Hogwarts.

Since I have taken over this body my connection to magic has increased suddenly, going from not having magic at all to having a life time of experience using it, it was like having a new limb. A new magical limb, my control over magic and its strength has increased considerably from what Peter was capable of.

I have access to the room of requirement, the stuff of fanfiction dreams.

It was not all encompassing, it couldn't access all the things in the castle nor could it make training dummies or training rooms or a Hyperbolic time chamber, but it could provide simple stuff like books from the library or anything in the castle which wasn't owned by a student or teacher. So, I was making decent progress in my magical prowess.

That along with the room of lost things was a treasure trove. I have scrounged up almost 700 galleons and 3 mokeskin pouches from the room of lost things. Along with some decent clothes which fit me and I hadn't even gone through 1/10 of the room.

My appearance has changed a lot since I woke up in this world. I'm clean, lost a bit of weight, made my head bald (better to have no hair than bald patches), still no looker but I'll take anything over what the original Peter looked like.

*