I have not actually SEEN the library, but many KH stories feature a library and so I'm just going along with my imagination and hope you all don't lynch me for not knowing.
Zexion smirked over his book as he watched Demyx cower behind a particularly tall bookcase in the library. The Melodious Nocturne was trembling slightly, and snatched up a book to hide his face behind the moment a tall blonde woman stormed in.
Waiting a moment, then pretending to have finished his book, Zexion walked over to the other Nobody and seemingly began picking out another, while actually holding a quiet conversation.
"I know what you did, Demyx," he hissed quietly. The anxious man jumped at being addressed by the Cloaked Schemer, and rolled his eyes.
"No you don't. No one was there when I—" he glared at Zexion for almost tricking him into confessing. "I don't know what you're talking about," he covered up coolly.
The slate-haired man grinned.
"What if I were to tell Larxene that it was you who stole her cookies, instead of Vexen who you so previously accused?"
Demyx blanched.
"No! Don't tell Larxene! Please!" he begged, when suddenly Zexion smirked.
"Don't tell me what, exactly?" came the high cold voice of the Savage Nymph. Zexion turned around and bowed slightly at the blonde, who proceeded to cross her arms suspiciously. Her eyes narrowed as she repeated her question. "Don't tell me… what?"
Demyx stuttered as he searched for an answer when Zexion handed Larxene a bouquet of poisonous flowers.
"IX here simply wanted to tell me how he thought you might like these flowers since they complimented your 'beautiful eyes'." Larxene snatched the flowers and glared at the two.
"Oh really? He said that? I seem to recall that he found me simply… terrifying…"
Demyx looked at a loss for what to say, and shuffled closer to the slate-haired Nobody.
"Oh yes. He does. But since he found those flowers, he thought that in a moment of kindness," Larxene and Demyx snorted at the same time; "he would give these to you."
The blonde woman glared at the two suspiciously, but smirked all the same.
"Huh. Well… alright. Maybe. But… are you sure this isn't a… say… apology for my cookies suddenly disappearing? After all, several other people here have been trying to… appease me…"
Zexion bowed once more and grabbed a stack of books.
"Trust me, XII, it is not an apology from me, for I did not steal your cookies." He opened a Corridor of Darkness and began entering it. Demyx gave a relieved gesture of thanks to Zexion, who grinned evilly.
"That would be Demyx." He laughed as Demyx's face went from thankful to horrified. Yelps and shouting filled his ears as the portal swallowed him up.
That would teach Demyx from stealing his cookies, too.
Standard disclaimers apply (sadface)
The flowers were actually an illusion, which Larxene forgot in her suspicion, heheheh. Poor Demyx, he shouldn't have stolen those cookies! This is just a one-shot for now (yes yes I keep saying that! Sorry!), and it's not Zemyx since I really don't like that pairing. I've got nothing against it, but it's just not plausible to me. I don't really like the quality of this, but it was just to clear up my writer's block and give you more distractions while I write up other stories and update more. It was a sort of... warm up if you will. Heheheh