AN: This is so short, I'm not even sure it's a proper story, more a musing, but the idea came to me and I couldn't get it out of my head, so here, enjoy.
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Sherlock loved chemistry, this was universally accepted. He also had a rather disturbing passion for biology, more particularly human biology. But one area of science he had never cared about was physics. It was pointless. It was useless, an opinion that Sherlock had stated on many occasions. Therefore you can see why John was so surprised to see him reading a book about that very subject.
"I thought you hated physics" John said, half jokingly, half serious.
"I think it is useful to know about everything"
"You didn't before"
"Well I do now" said Sherlock, clearly annoyed with the conversation.
"What brought on this change of heart?" Sherlock made no sound, now fully engrossed in the book he was reading. John sighed and left 221b shouting something about milk.
Sherlock heard John leave and sat up. He still found physics incredibly dull, but there was one thing he liked about it, something so stupid, so sentimental that it almost made him gag. He liked atoms. This in itself was not that bad, it was the reason he liked them so much that made him feel so embarrassed. They reminded him of John.
"Well look at it this way" he explained to Billy, the only one who could ever know this "they're small, John's small." Most people saw this as a bad thing, but Sherlock loved it, John's head was exactly the right height to fit into the crook of his neck. "They're incredibly difficult to break, so is John. They form strong bonds very quickly, he killed a man for me the day after we met. They're-" he stopped, he couldn't say something like that out loud without having to run to the bathroom. But he could hear the words echoing around his head lid and clear, for some reason they didn't sound so silly in there. They are the most important things in the universe, they are what keeps me breathing.
