After the battle of Hogwarts and after helping with the cleaning until McGonagall sent him home, Harry took a Dreamless Sleep so he could sleep. Well, he wasn't expecting waking up with his aunt banging in the door and screaming. Turns out aunt Petunia didn't find out where he was living and went there just to berate him for making her family move or whatever, no, Harry didn't know how it was possible, but he was back to the day he got his first Hogwarts letter, and Harry only realized that when he was out of the cupboard and went on to get the mail and saw his letter there.
Harry tried to act as normal as possible, but he was freaking out, like how in the holy fuck he managed to time-travel sleeping? Was that really Dreamless Sleep that he took? As far as Harry is aware, there's no time-travel potion or whatever! The only thing he knows about are the time-turners, but he and his friends accidentally destroyed all of them back in their fifth (or forth, in Ginny and Luna's case) year and besides, time-turners don't make your soul time-travel! Harry decided to keep everything up until Hogwarts the same, except for the small part where he decided to freak aunt Petunia and uncle Vernon out by just saying "I got my Hogwarts letter. Don't know if I wanna go, though... I heard their headmaster is a goat and one of the professors is a bat. Probably. I might be misremembering." and as he hoped, this freaked the fuck out of Petunia and Vernon and they took his letter away and didn't allow him to reply. So the endless letters started. And then Hagrid happened.
Once he was at Madam Malkins, he saw Malfoy again. But something was off. He and Malfoy accidentally made eye contact and it hit Harry like a brick, Malfoy is also in the same boat of "I-time-traveled-somehow-probably-the-universe-wanting-a-laugh". So Harry says "I know I should probably be freaking out even more now, but I'm kinda glad I'm not alone here" and Draco asks "You too? First Pansy, Blaise and Daphne and now you?" and Harry is surprised "So there's five of us?!" Draco replies with "Apparently, yes." Harry then asks "What are you guys planing to do?" Draco replies "We're not sure yet, we didn't have anyone that was on the light side, we only had Daphne, her family is grey. So we were a bit blind on how to defeat the Dark Lord and all. But now we have you, so..." Harry asks "So you guys really want to defeat Voldemort?" to which Draco replies "Yes. I don't expect you to trust that immediately, but I'm hoping we can work together?" Harry isn't sure what possessed him to agree with a "Yes. Meet me at the train and bring the others, we can discuss the details on the way to Hogwarts."
Then the first of September came, and Harry found some isolated place to seat and wait for Malfoy and the others. When they arrived, though, Malfoy had not only Parkinson, Zabini and Greengrass with him, but the rest of the Slytherins of their year too. Great, it seemed like he was the only Gryffindor that returned. Harry then, just to be sure, asked "All of them remember?" to which Malfoy replied "Yes, all of them remember and want to be part of the plan." Harry sighed and then all of them started to make plans. The Slytherins unanimously decided that Harry would be one one of them this time around and Harry just sighed and agreed.
When they arrive at Hogwarts, and the classification starts, Harry is a bit nervous that their plan will fail if the hat decides that one of the Slytherins doesn't fit the house anymore. So when it was his turn, the hat really laughed. Loud. So he had everyone already starting to judge him and he wasn't even classified yet. Great. The hat then went on and said in his head "So I see you will finally accept my first choice of house?" and Harry replies "Yeah, yeah. Now go ahead 'cause this is getting really embarassing for me" the hat laughs again then says "Better be SLYTHERIN" and the "first" years that had already been classified to Slytherin just stared at Harry until he sighed and said "The hat thinks our situation is hilarious."
Once they were all in the Slytherin common room, one of them casts a silence charm so they can talk freely. Harry then goes with "Okay, so should we go for the stone right away or wait at least the first week?" the others reply with "Wait" and Draco then elaborates "We should at least try to be normal for the first week, then we can go crazy and go after the stone"
They tried to act normal. It didn't work. Snape was really side-eyeing all his first year snakes, they were just way too weird, all of them. The way they would whisper to each other and then go real quiet when someone else even looked in their direction, how once he caught the Malfoy boy sleep-making a potion and then the Potter boy arrived and just...Took the knife out of Malfoy's hand and started to reprimand him for putting himself in danger? Like this was a normal thing an eleven year-old would do...Yeah, that was just too suspicious for Snape.
Then by the end of the week, Harry leads the others through the "Stone Trials" as Draco jokingly called it once, during the train ride, and it ended up sticking. They get the stone and send it back to Flamel.
Then they go Horcrux hunting and Harry decides that maybe the basilisk would make a good friend, so Harry sneaks into the Chamber and talks with the basilisk, who is really friendly when it's not being controlled by Voldemort. The others are way too dumbfounded to even say anything about that, when Harry tells them what he did. Draco passes out, though.
When the Horcruxes are solved, Harry decides it's time to get Sirius out of Azkaban. So they all make a plan to kidnap a rat. They do it and send Pettigrew direct to Madam Bones' office. General public loses their minds when the truth comes out. When the first year ends, Harry goes to live with Sirius.
The second and third year are normal. But then in the fourth the Tournament is on again, Harry is just done when his name is called again. Draco just sighs and says "We should've seen that coming, right?" and all of the others, including Harry, reply with a "Yes". Harry and Draco started dating during the summer, so they aren't really pleased that the Tournament is gonna take away their time together.
The Tournament happens, but Voldemort doesn't return, since they took care of that during the summer of their second year. So it was really disappointing for Barty Jr when nothing happened in the end of the third task.













