If you're looking for a short horror story to fit that theme, here is a quick tale about a writer who gets a bit too close to their subject: The Final Draft
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A cold draft rattled the floorboards. Viktor chuckled, mentally noting the "cliché atmospheric effect." Then, he heard it: a soft click-clack of keys. If you're looking for a short horror story
He looked at his screen. Below his last sentence, new words were appearing in real-time, though his hands were in his lap:
Viktor froze. Behind him, the heavy oak door creaked. He didn't turn around. He didn't want to see what was now typing the next sentence: He looked at his screen
Viktor always sought "authenticity" for his horror articles. His latest piece, The Anatomy of Fear , required him to spend a night in the abandoned Blackwood Manor—a place locals claimed breathed on its own.
The cursor blinked once, twice, and then the screen went black. He didn't turn around
He sat in the center of the rotting library, his laptop screen the only light in the suffocating dark. He typed: "True horror isn't the jump-scare; it's the realization that you aren't the observer, but the observed."