I like writing things like this. Disclaimer: not mine.
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When he was very small, Sora was afraid of almost everything. After all, monsters lurked in the tall grass shaded by the palm trees, they prowled around under the shadows in the water, in the sea-grass, they waited and watched from his closet and under his bed, always ready to eat little boys with brown hair and pretty blue eyes. Sora drank up every word when Riku said that, and didn't think to question him at all. Riku was bigger, he was older, and they were best friends—if Riku said there were monsters, there were really big, ugly, hulking monsters waiting to eat him.
When the Heartless came, he stopped caring about the monsters from his past and started focusing on the monsters that took lives and ate the hearts of those who couldn't defend themselves. The monsters under the bed, in the closets, all of those places, they weren't real so he didn't have to worry about them anymore. Instead, he worried about a god of the Underworld, a power-hungry wizard, an evil witch, and his best friend who was also his worst enemy. He didn't know how many nights he had spent curled up in whatever bed-like thing he, Donald and Goofy had managed to find, thinking about the past and the monsters Riku protected him from.
When everything was over and they returned home, Sora didn't know what to think. Everything was supposed to be easier, was supposed to be normal, but he kept having dreams, nightmares really, of shadows and darkness and all things wrong in the world, even when things were supposed to be right. Riku and Kairi had started to notice, too, and one night, under the grounds of a sleepover, Riku stayed over at Sora's house, locked the door and curled up in bed with him. The situation wasn't as awkward as Sora thought it would be, or as it might have been were Riku someone else. Innocent enough, Sora had curled close against his side, like they did when they were children, and fallen asleep for the first full night of sleep in weeks.
Riku could not be with him every night, however, and one night, Sora woke up, pale, sweating and panting, fingers curled tightly in the sheets. Swallowing down any noises, he calmed down, sitting up slowly and forced himself to stand up, walking mechanically over to the closet, throwing it open. No monsters there. He went to his drawers next, and his desk, throwing them open and then shutting them quickly, turning to the last place. Kneeling down, he brushed his bangs out of his eyes, looking under the bed—
--and a pair of glowing yellow eyes looked back at him, a body, dark and lanky, following. "I'm much scarier than any monster you could hope to find," Anti-Sora hissed, and Sora couldn't even scream.
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Bwah. Comments loved!