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L's Secret
Light cringed as he watched Ryuzaki pop yet another sweet into his mouth. How could he possibly eat that many sweets and not get sick? He remembered the time when, at the fair, he had eaten a whole bag of cotton candy, against his father's advice. Light shuddered involuntarily, at the memory of the nausea that came after they returned home. Since then, Light hadn't had much taste for candy. He turned back to his files as he heard the crunch of another candy wrapper.
"Light, would you like some?" Ryuzaki asked, holding out a mint for him. "Er, no." Light was unable to conceal the shudder that ran down his frame at the sticky-sweet smell. "Thanks anyway."
"Okay then," Ryuzaki mumbled and slowly brought the candy to his mouth. He loved watching the others react to what they perceived as his freakish candy addiction. In truth, while the candy served a genuine purpose (the sugar stimulating his mind as well as giving his hands busy work unwrapping the candies while he was deep in thought), Ryuzaki took no pleasure in his constant candy high.
In fact, although nobody would believe him if he told them (not that he ever considered telling them), Ryuzaki hated candy. It took years of practice for his stomach to be able to tolerate the constant barrage of sugar and caffeine. It was a mystery to him how he survived without becoming a diabetic or his teeth falling out. How he kept so thin was no mystery, however. He was (although no one would ever guess) a very active man, often spending hours working on his martial arts in the wee hours when most sane people were sleeping (but who would ever accuse him of being entirely sane?). That, coupled with his unnaturally high metabolism, served to keep the world's greatest detective fighting fit.
Like his real name, and the little kitten who lived in his room, the fact that he hated candy would remain L's little secret.