well, damn.
to understand this story better, I read it aloud as if I was narrating an audiobook, complete with character voices (though there are only two), and I completely psyched myself out.
Way to go, Joey. Read a horror-filled short story to yourself out loud alone in your house at night. That totally won't give you chills and cause you to glance around as if

Spoiler

YOUR not-so-dead sister will show up all bloodied and kill you

but yeah this story is creepy af