Author's note: I forgot to say before but the story is set after the Christmas holidays, of 5th year. So it is sometime in January. I also changed a bit of Chapter three, instead of Six moths the spell now lasts for a year, this is because I just realised that it would make any future relations between Sev and Harry illegal when he got back, so this will take him well into his 6th year and over the legal age of consent.

Here is an Answer to the Question as to why Harry wasn't told about the switched thing. Well Sev didn't tell him well would Harry have believed him? I don't think he would have. And Dumbledore didn't say anything because he was trying to preserve the time line.

Part five:

Harry entered the great hall, he glanced around. The hall itself seemed the same but Harry never appreciated how much the pupils themselves added to the 'feel' of the place. The Grifindor table was filled with unfamiliar faces something that he hadn't felt since his sorting.

"Hey Jamie." A much younger and healthier looking Remus called. Harry smiled at him. Next to Remus sat the betrayer Harry had a hard time not glaring at him but he managed to force a smile. Harry took a seat next to Remus and Si sat on Harry's other side. This must have been the normal seating arrangement because no one said a thing about where Harry chose to sit.

"Jamie what happened to you?" Reme asked. Harry pulled a face.

"Urgh. I have already explained it all." He said cheerfully, "Si you tell them." With that Si launched into a highly dramatised version of what had really happened, involving, somehow, a dragon, a damsel in distress and Severus Snape. Harry laughed. But found his eyes drawn to the Slytherin table where a much younger Snape sat. He could hardly keep his jaw from dropping Snape was, for lack of a better word, hot. His long black hair fell around his face in a silky mass. The face that Harry had remembered being sallow was a beautiful ivory. Even the scowl that was on his face was gorgeous. 'Harry James Potter, you will get a grip on yourself' he told himself sternly, but a wicked little voice in his head muttered 'but you would like to get a grip on someone else though wouldn't you.'

"Well that's Si's version and since you all know him you will also no not to believe any of what he just said." Harry said mockingly, trying to cover up his distraction, he would not allow himself to be distracted by Snape of all people. Reme and Peter laughed at the statement while Si pouted, pretending to be angry.

"He's got you there Si." Reme said between burst of laughter, Si agreed reluctantly and smiled.

Harry watched the marauders; he had never seen them act this way before. They all seemed so comfortable with each other, so happy. Remus didn't have the shadows under his eyes that Harry remembered, Sirius was so very full of energy something that all those long years in Azkaban had robbed him of and Peter, Peter seemed to revel in the others company.

"Jamie, we have to think up something to do. The people are getting complacent we need to shake them up a bit." Si whispered. Harry smiled wickedly; Fred and George had played enough pranks in all the years Harry had been at Hogwarts to keep the rest of the Marauders entertained for months.

"I do have one idea..."

Harry stood next to Si as they waited outside of Professor Aquilina's room huddled together under his invisibility cloak. He couldn't believe that the greatest pranksters of all time hadn't thought of using Polyjuice. But then of course none of them really did like potions.

"Jamie, how do you know this will work?" Si asked. Harry almost sighed he couldn't tell him that he had made this potion before an that they had snuck into the Slytherin common room, though that feet in itself would probably impress them greatly, so he settled for a partial truth.

"A friend told me."

"Who?" Sirius intergraded. Harry smiled.

"Now you know I can't tell you that." Harry winked as if to imply that he had got the information using less than honourable means. Si smiled knowingly and left it at that.

The Professor finally left and Harry and Sirius slipped inside. Harry looked around noting just how different it was compared to the way Snape had kept the room. Aquilina kept he room light and airy she had even gone to the trouble of creating windows. They showed the Hogwarts grounds the must have been spelled to show the same as some of the other windows. Si was also wandering around as if in a state of awe, he had never had the need to sneak into a teachers office before so this was knew to him, Harry smiled finally a rule he broke better that the marauders themselves.

"What do we need?" Si hissed.

"Shh, don't worry I'll get what we need." Harry looked over the shelves picking out everything they would need, he was careful not to take as much as it would be missed. Finally he had everything they needed.

"Lets go" Harry hissed at Si, and threw the invisibility cloak over them. At that moment there was the sound of footsteps outside the door. Si took a sharp breath. 'Great' Harry murmured 'does every generation have some teacher who is hell bent on disrupting my plans.' The pair stood side by side next to the door waiting for whomever it was to pass by. But they had no such luck, the footsteps stopped directly outside of the door.

The door swung open and Professor Aquilina strode in. Harry almost laughed at the irony 'and it is a potions teacher spoiling my fun.' She was clearly here for a purpose other than the intruders, as she didn't even think of searching for anyone ho shouldn't be there. She went to her desk and riffled through the papers pulling one sheet out she smiled to herself. Tucking the paper inside her robe she turned and left.

Sirius sighed deeply.

"That was way to close Jamie." Harry smiled, Sirius was actually scared of getting caught, something must have changed as in the later years when they had made the marauders map they can't have had any fear of being caught. Because stealing the plans for Hogwarts, well if they were caught the shit would defiantly have hit the fan in a big way. With a start Harry realised that it could have been his fault for the change, it probably was his fault for the change. Before the fifth year they had been about Fred and Georges level nothing really important but after that was when they became animagi and they made the map.

"Don't worry Si, I never get caught." Which was true as from James' diary he knew that James had never been caught and Harry sure as hell hadn't, well there was that one time with Moody but that didn't count it wasn't fair for teachers to be able to see through invisibility cloaks. Si looked at Harry a strange look on his face.

'Oh shit, oh shit. He knows something is wrong.' Harry panicked.

"Jamie, something odd is going on you well never quite so happy about blatant rule breaking before." Si asked. 'Oh shit' Harry mind screamed. He forced a smile.

"Si, you know me. I get bored easily. Have to find new challenges." Harry said hoping that the answer would satisfy Si. He looked around "and the next challenge will be getting back to the dorm without having another run in with a professor." Si nodded accepting Harry answer.

"Well let's get out of here and get with the potion making." Si smirked forgetting about his suspicions about Harry.

They made it to their dormitory with no more mishap. Well there was a slight problem with Peeves. The mischievous ghost was trying to get Harry and Sev caught. With chants of: 'students out of bed' but luckily no one cared was Peeves was jabbering on about so Harry and Si got to their dormitory in one piece.

"Reme, Peter. The intrepid explores have returned." Si called out as they entered the dorm room. The pair instantly sprang from their beds, still fully clothed. 'pity' a little voice in Harry muttered, and it is safe to assume he wasn't thinking about Peter. Harry felt like banging his head against a wall, why was he thinking these things, he had known he was gay for a couple of years but he wasn't normally as horny as this. A thought about Malfoy's ass here 'he really does have a nice ass' and a thought about how Seamus would look naked there. Usually these thoughts were few and far between but now. now he had had thoughts like these over two people, his professors no less, in one evening. 'Maybe it is the lack of the pressure of being 'the boy who lived' and I am just acting like any normal 16 year old male, well who is gay', he couldn't make any kind of a move or Remus it would kill Si, who at this point still insisted he was straight. Plus James himself was straight so it would majorly fuck up well, everything. Harry smiled at Reme, but the smile was tinged with sadness, it would be years before those two finally got together. Harry hated knowing what was going on yet unable to tell a soul, he knew that Si really did love Reme but was just to stubborn to admit it.

"Si, have you got the ingredients?" Reme asked bounding over to Si. To Harry it werewolf felt about Si ' that is the benefit of hindsight I guess' but yet he couldn't say a damm thing. Si smiled at Reme.

"Yeh we got them, thanks to Jamie." Harry smiled at them.

"Well let's get to making the Polyjuice." Harry instructed.