"Avada Kadavra"
Harry woke up in a dark room wondering what happened after the killing curse hit him. He wondered what the afterlife was like but this just seemed like a big letdown.
"Hello Harry" walking toward him was Albus Dumbledore seemingly out of nowhere.
"I'm so proud of you my boy. You did everything that was asked of you and so much more. I was sent here to give you a chance to experience everything all over again."
Harry thought to himself, 'why would he even think I would consider this? He had accepted his fate and they want him to do it all over again just to end up in the same place?
"Sir, I mean no disrespect but I'm done, I gave them a chance to finally end it and I just want to be with my family again. Why would you think that I would say yes after everything I went through to get here?"
The headmaster smiled sadly at him and responded, "This is exactly why Harry, you did everything that was asked of you, for the ones you love but never got a chance to fully live and enjoy it. What is being offered to you is a chance to go back to your 8th birthday. A chance to free Sirius and have a better childhood than the one I gave you. Get to experience what a real childhood is like." Here the Headmaster stopped and gave him a penetrating gaze.
"I want you to understand my boy, that although there are many positives you have to know that there are things that you cannot change no matter how much you wish you could. There are key points in your life that have to be experienced, hardships that need to be experienced, and tests that need to be taken."
"I'm not sure I completely understand sir." Although he was initially set against it, the chance to live some of his life with Sirius, was something he wasn't sure he could turn down.
"There are events in your life that you can change but cannot avoid. You might choose to be a Ravenclaw and study and be better prepared. A Hufflepuff and play the underdog so that you may be underestimated and can surprise your enemy. Maybe go to Slytherin and change a few perspectives there and save a few children from going to the dark. You may choose Gryffindor and remain with your friends and the life you know and just improve on it. Most events that happened in your school years must happen but you can avoid unnecessary danger. The sorcerer's stone rescue must happen because without it Voldemort might come to power sooner, it is necessary for you to banish him so the timeline can stay in place. In your second year you must slay the basilisk and retrieve the sword so it can be used later but you can try and avoid some people getting petrified. In order to free Sirius you will have to somehow make a trip to Gringotts, there will be a letter from your parents to you stating that Peter was the real secret keeper. Peter must remain in Hogwarts until your third year so the resurrection can happen as it happened in your time. The tournament must happen and you must end up in the graveyard whether you take Cedric Diggory or not. You can try and be as prepared so that hopefully some things can be prevented but understand that you are not a God and not everything will turn out as you wish it would. Now here is the most important part Harry. The battle in the Department of Mysteries must happen, without it Fudge might not acknowledge Voldemort's return and many more lives can be lost. Before the battle you may inform Sirius and only Sirius of what you know and what must be done. You can make an effort together to try and avoid his death but acknowledge the fact that it may happen. Once this battle occurs you are free to make any choices you wish."
Harry just listened to everything gobsmacked. This seemed too surreal, but how could he not go back? He could try and save Cedric, Sirius, Remus, Tonks, Moody, and Dumbledore himself. So many lives lost that should have been there to see the day Voldemort fall. Be able to live without the fear of Riddle terrorizing the world they live in.
"What about the horcrux in me sir, will I be able to go back just to have to die again? Will you know any of this in the new timeline?" Harry asked.
"No my boy the horcrux in you is gone. When he takes your blood in him it will form a connection much like the one before that will allow you to be connected and have visions but will only exist in the blood you share. If either dies the connection will be lost. You will still have the abilities that originally were transferred over, these will remain with you always. And no I will not know of any of the new timeline. I must warn you to be patient and please understand that although I have and will make many mistakes with you I've never done them to intentionally harm you. I always did what I thought was best. It pained me greatly that I wronged you so many times in effort to help the greater good.
While Harry was contemplating this Dumbledore spoke again. "Also Harry you must know that you will experience what you magic should have been without the Horcrux."
"What do you mean sir?" said Harry.
"My boy, while the Horcrux didn't actively change you too much, it still managed to suppress some of your magic. Not by an insane amount but the dark part of it tainted your soul which was innately untarnished and pure. Constantly warring at each other didn't let you reach your full potential. By never having a Horcrux in you it will allow your magic to develop more than it originally had. Use your time wisely my boy, you'll have three years before starting Hogwarts in which you may want to develop wandless magic. You won't be a master but hopefully you'll be able to achieve some basic spells and you can continue to do so even after starting Hogwarts. While you should study some more obscure branches of magic also go back to the basics. You missed a lot of basic concepts because you never fully studied to your potential. Make sure and develop your Occlumency before you reach Hogwarts because you have a lot of secrets that can't be divulged to anyone until you are ready to do so."
"I'll do it sir" Harry said with tears in his eyes. "I'll make it better"
And with that everything went dark and Harry knew no more.