Disclaimer: The only thing I own is the story idea and only some of the witty remarks. I own so little; so please don't steal.
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Alterations
It is an unusually crisp August day and they are inside because despite Simon's headstrong behavior, his body is still easily caught up in a cold. Inside, it is warm but stationary; Simon curls up under a ridiculously large shawl dug up somewhere in Jack's closet and sidles up to Jack, sitting next to him on the couch and scouting out the television's stations. "Jack," he purrs, because his voice range lets him sing high but also make the sound rumble in his throat, "what makes you like me?"
Jack presses next and says, "What a girly question."
"Really!" Simon flounders for a moment, fumbling his way around the baggy shawl and turns to face Jack with determination. "I'll ask it another way. Why do you like to kiss me?"
Jack presses next again and feels his face redden. He is older but his face blushes; Simon's, on the other hand, seems unaffected as if they were just sharing stories about classes. "What a bloody waste of words," he scoffs, settling on a sitcom about feuding families while his finger ghosts over the buttons on the remote. He hopes degradation will make Simon drop the subject but Simon merely presses into his arm, resting his cheek against his shoulder.
"I'll tell you why I like to kiss you," Simon says, taking no regard for Jack's feelings about the subject. "Because it lowers your defenses and knocks you off your high horse." He giggles when Jack drops the remote to attempt to silence him by tickling his sides. "But really," Simon continues, after they stop fighting and Jack's hand rests on his waist, "because you're sweet and stubborn and proud and all that rubbish." His coy smile twists into a smirk. "But you probably just think I'm just cute."
"Don't flatter yourself," Jack retorts. "It's not that, it's…" His mind blanks, blissfully clear of any sort of answer. It's not that he doesn't know what he should say; all that romantic shite won't work on Simon. The boy would know if he really means it or not; Simon stares up at him eagerly. But he truly does not know; the flow has carried him along this path and he has not resisted it. He must say something, so he opens his mouth and this comes out: "It must be pheromones."
Simon makes a face. "What are pheromones?"
"Chemicals. Basically you give off chemicals that set off certain proteins in my brain that in turn release more proteins that make me want to snog you. …is what happens." Jack doesn't mean to get preachy, but he's just covered this topic in biology. Simon seems to think this over.
"Scientifically speaking," Simon says eventually, slyly slipping onto Jack's lap in a single movement, "it could also be magnetic." He runs a hand down the nape of Jack's neck and worms his way closer. The television has been forgotten. "Are the pheromones working yet?"
"Who taught you to be so bloody seductive?" Jack asks, but he draws Simon in closer and the pheromones must be bouncing in his mind because he can't think straight when he kisses Simon and his mind is still troublingly blank and this cannot be a good thing.
End
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Note: Jack should know why he likes someone before they get any more intimate. This is called foreshadowing, guys. I've got this whole AU timelined, I'm such a nerd for this pairing. Why is Simon getting less and less harsh toward Jack? Hmm. The next Jack/Simon should be a shot in the dark. I'm anticipating it. Thanks for reading!