Lily's death was the motivation of the whole adult life of Severus Snape, his deepest regret, something he has never forgiven himself for.
That Lord Voldemort made Lily, among others, his aim, Severus knew for about a year before that tragic night. What did he do to save his beloved? What happened that we haven't been shown in canon? Maybe there was only one tiny element that needed to be changed to change the whole outcome?
...or maybe it didn't happen at all?
If this spurs your inspiration, feel free to share your impressions with us in a form of art or fic.
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