Lily Dursley tried to live a normal life despite the fact that neither she, her son Harry, nor her nephew Dudley were normal at all. The identical houses along Privet Drive concealed a great deal; behind the walls of #4 was a witch who had turned her back on the wizarding world and two underage wizards who were currently on Summer break from Hogwarts School of Witchcraft and Wizardry. Today however, Lily was doing something that was as far from normal as possible, even in the wizarding world. It was for her nephew, the Boy-Who-Lived that she was doing this.
Ancient tomes in Latin, Greek, and Runes were spread about her usually pristine living-room, and a summoning circle had been drawn into the carpet where her rather expensive glass-topped coffee table had been. After nearly an hour of chanting the words that would bring the being she wished to call forth across the worlds, a shape began to form. When the long invocation had ended, she backed away in surprise for the person she had expected to be there wasn't and someone else was there in his staid.
To understand how Lily got herself in this position, one would have to go back to her last year at Hogwarts when she had been dating James Potter....
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Peter Pettigrew sat in the kitchen of the Evans home on Christmas Eve sneaking freshly-baked buscuits as they cooled. He had been invited over with the rest of the Marauders by Lily's mother. He pulled his hand away from the tray as if it were on fire when he heard the kitchen door slam. A crying woman who he assumed was Lily's older sister entered. As he listened to the sobs of the young woman who had not yet noticed him, he debated whether to sneak away quietly before she noticed him or whether to go and comfort her.
Screwing up the courage that he had not been known for for the first time in a long time, he walked over to her.
Over the following year, Peter and Petunia wrote to each-other even after James and Lily's relationship had exploded spectacularly in the Great Hall after Easter break with accusations of everything from Amortentia use to false promises made by both parties. It was through these letters in which both had expressed their doubts about everything from their friends to their places in the world that a relationship was formed. It was thanks to this relationship that Petunia was able to go against her family's expectations of her, and Peter was finally able to grow the backbone he lacked. After he graduated, Peter began to date Petunia who was two years his senior.
Due to the closeness of both families amongst other things, it was expected that one of the Evans sisters would marry Vernon Dursley. Until the Christmas of 1977, it had been a forgone conclusion that it would be Petunia. Instead, a Lily who had become rather disillusioned with the wizarding world and desired to leave married him two months after graduation. She had lost her best friend and first love to the Death-Eaters due to her own rash actions after he had lashed out at her while the Jerk Potter tortured him. The boy she had thought she loved (the Jerk Potter himself) but hadn't really had made her last months at Hogwarts a living hell and turned most of her friends against her. It was due in part to this, and mostly because of the dark wizards who were trying to destroy her kind (muggleborns) and all they represented that she wanted to forget the magical word.
Petunia however had found her prince in the form of one Peter Pettigrew who still couldn't believe his luck. They were married on the first day of Autumn 1979 in a beautiful ceremony in which fall foliage in bright yellows, oranges, and reds fell around them under a miraculously cloudless sky. That Christmas, both she and Lily both announced that they were expecting (Lily sometime in June, and herself either in late July or early August).
Had Peter never found Petunia, he probably would never have been able to muster up the courage to directly refuse Voldemort's request that he join him three times and he probably would not have had to go into hiding with his wife and son. If he hadn't gone into hiding, Sirius Black would not have been tortured to death protecting the secret of the Pettigrews' location. If Sirius Black hadn't been tortured to death, they would not have had to select a new Secret Keeper. If they hadn't chosen a member of the order at random so neither of Peter's two remaining friends would be killed, they would not have been betrayed by a person who turned out to be a spy. If they hadn't been betrayed Dudley James Pettigrew born on July 31, 1980 would not have become the Boy-Who-Lived.
On the morning of November 2, 1981 when Lily Dursley found her nephew on her doorstep along with the milk she cursed the wizards who had been stupid enough to leave him out all night with only a blanket to keep him warm. Dudley spent the next ten years being warned of the wizarding world and its expectations of him by his aunt who had cut ties with said world. The young boy who ended up becoming a Hufflepuff did not entirely believe her until his first year at Hogwarts, at the end of which he ended up facing the disembodied Lord Voldemort who had been living in the back of Professor Quirrel's head.
It is because of Dudley's encounter with Voldemort that Lily was sitting in front of the summoning circle in the middle of her living-room floor doing magic for the first time in more than a decade. When she had decided to summon a Boy-Who-Lived from a reality where he had already succeeded in order to help her Nephew, she had expected either an older version of her nephew, or a bigger and more confident Neville Longbottom. She did not however expect a younger version of James Potter.
