Sunset Shimmer just got to the hoomyn world and needs a place to stay. The obvious solution is to murder the other her and take her place. Underage-futa-murder-rape ensues.
This is a prequel to Sunset for Twilight.
Contains: anal, deep-throat, digging your own grave, futa, getting off on despair, implied deserving it, loli, necrophilia, normal high-school girl activities, obvious lies, poor self-esteem, rape, selfcest, snuff, underage, vaginal
(This is alternate Chapter 53 of the story "Celestia's Relaxing Vacation". Most of the story is hosted at https://www.fimfiction.net/story/197090/celestias-relaxing-vacation, but since fimfiction doesn't allow stories involving underage humans, I had to make this one chapter elsewhere. If you want to read the entire fucked up story, you should start there.)