This is a song fic about Severus Snape and Lily Evans.   It's about Snape, and how he regrets everything he did for Voldemort and such.  Note: This takes place about a year or so after Halloween and the death of Lily Potter, so Snape really was just mourning over it still.  It's a simple song, and an even simpler story.  It's just about grief and sadness.  It's simple.