Lily's worst memory:
Every time Lily Potter even thinks about her worst memory, she's overcome with emotion. Even now in the afterlife, she has crying jags for hours from dwelling on it for too long. But the fact is, most people wouldn't get so emotional from their worst memories, because the fact is, she has two. If she ever encountered a dementor, which she never had and hoped never to, even when Dumbledore told her after a particularly draining heart to heart that a dementor would never have an effect on her, and would simply be confused. Lily always had been different…
Her first worst memory, and also the earlier of the two occurred in the sixth year of Hogwarts, and involved her first love, a certain Severus Snape…
They had been friends ever since they'd met on the train, on their very first day and first year of Hogwarts. Although it wasn't seen a normal by the rest of the school, especially their own houses, they shared a great bond, and were wonderful friends. As fifth year begun, it seemed to Lily and Severus that they were drifting apart. They had always done everything together, from sitting with each other at lunch (much to the displeasure of the Slytherins and Gryffindors) to sneaking off to Hogsmeade together, before they were officially allowed. They had even found a private room, where they could be alone if they got tired of the excessive house rivalry, or wanted to hide from the marauders.
When they arrived back at Hogwarts, it seemed like their houses were trying to sabotage their friendship. Lily's Gryffindor roommates, Alice, Venus, Brooke and Phoebe were always talking to her, wanting to show her a new make up charm they'd learned, and just generally being clingy. They all tried to discourage her from being friends with Severus, but she refused to stop being his friend, as she was sure that it was a friendship to stand the test of time. She was even starting to develop more than friendly feelings toward him.
Severus's housemates in Slytherin were also talking to him and telling him about spells, but in a bit of a different manner. The 7th year Slytherins, especially Lucius Malfoy, Rabastan Lestrange and Amycus Carrow were actively campaigning to recruit Snape into the Death Eaters and into Voldemorts service, as well a telling him plenty of Dark spells, charms and hexes. There were rumours that he was Voldemort's personal potions master, but that didn't actually happen till half way through their sixth year. His friends were also starting to discourage him from his friendship with Lily, they were personally appalled that he was even talking to a 'mudblood', but they were a bit more subtle about it. The more than friendly feelings that Lily had developed were more than mutual, as far as he was concerned. So when he spoke that forbidden word to Lily, after she had defended him from those idiots, James Potter and Sirius Black, he withdrew from the reasonably nice person he was, and immersed himself into the Dark Arts.
Lily was devastated, she thought that their friendship was just going through a phase, and that spark of hope that she thought she'd seen had been ignited, just when Severus had uttered one word. She really was truly devastated, retreating to her room for nearly a month, only coming out for classes when Remus came to talk to her.
When Severus called her a mudblood, and forever ended their friendship, that was one of her worst memories.
A/N: Lily has two chapters, the next one will be up soon. After that it's Dudley. Requests are welcome.