Author's Note: This takes place eighteen years after "Toofy" and "Drachne", and likely contains some spoilers. However, it should be easy to follow along without having read it.
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The woman standing on the ladder, carefully balancing as she slid the books back onto the shelves, was a slight figure. Her hair was pulled up tight behind her in a threaded ponytail, showing a calico mix of black and gold.
Both tiny furry ears that poked out of the top of her head were black, though the insides were a pretty little pink. They were currently flattened as she concentrated on filing things in the correct order to match her system.
Her nose was crinkled up with concentration, causing her gold-rimmed glasses to slip further down, almost threatening to fall off, but not quite. She was too busy to even notice that she was no longer alone in the room, and the other catgirl was angrily tapping her foot on the floor in impatience.
"Toofy's going to fucking skin the cat alive if she doesn't pay attention!"
The woman let out a surprised miaow and fell backwards off the ladder. She landed lightly, before trying to grab at the books she had been carrying, which mostly ended up all over the floor.
She pushed her glasses up habitually as she scampered to grab and inspect the books, before putting them onto the stepladder. The woman thought for a moment, and then a look of abject horror crossed her face and she ever so slowly turned.
The other woman was black haired, and her cat's ears were white. However instead of gold, her eyes were a deep and furious red. Eyes that were now trained on her.
She miaowed again, and bobbed her head, stammering nervously, "Em-empress! She's so sorry! So sorry! Millie is very, very sorry, empress. She's a bad kitty. Very much an airhead, she's sorry. She finds it difficult to notice when people are talking to her, and she always seems to -"
"Not know when to shut the fuck up." The empress interrupted, as Millie looked at the dragon teeth piercing the other catgirl's head from her crown, as she realised they weren't actually an exaggerated barroom tale.
She cringed and gave a nervous smile, "Sorry."
"Stop apologising. It annoys Toofy." The empress replied, "She's here because she needs to find something. Something hidden. Something old."
Millie pushed up her glasses, "A book, your grace?"
"Toofy is looking for something that old emperor hid in the Archives. She isn't sure if it is book or scroll, or even made to look like something else entirely." The catgirl mused, "However, she heard from many people that the librarian has a system of order. Make it hard to keep something hidden, if it didn't obey the system. Even if it did, the librarian would have a record of it, then."
The woman nodded quickly, "She sees. Hmm. The Millie arranges things differently in the Royal Archives. Other places, like Temple, order things by acquisition date. However, Millie thinks that's stupid. So she made an index, so that items could be arranged by type of document, then by topic, and then by other features such as author or publisher."
"She sees." The terrifying empress who had eaten the heart of a fucking dark god said with disinterest, "Toofy has spent long time in many libraries. All the secrets can always be found. But she doesn't have much time today. Her Ink came of age today, and fucking elven blood has screwed up her hormones. So... Librarian... The fuck would we find what bastard emperor hid!?"
Millie flinched, whining as she pushed up her glasses again. She scampered over to her desk, carefully putting down her books, before opening a large book of lines filled with handwritten numbers and titles.
She scanned it quickly, "Would her grace know a time it was hidden? Previous emperor hid it, which means eighteen years ago. Much before then?"
"About six months before Toofy killed him." The catgirl said darkly.
Millie cringed, trying not to remember how there hadn't even been a body to bury, afterwards. Not that anyone would have been interested in burying Kaden, not even his concubines. The man had been a jerk.
"Three items of note came from emperor's office in that time." Millie mused, "Two scrolls and... Box. Locked box seems like might contain secret. Would empress come with Millie?"
She scanned the shelves for the numbers as they walked, "Physical sciences... Divine philosophies... Geometries... Here we are. Differential geometries of spacial magics."
Millie walked down, eyes flicking around the numbers as she continued to push her glasses up her nose. She was kind of curious what it was that the emperor had hidden in her archives. She was also quite attached to living, and so didn't want to get caught up in the politics of her empress.
She had been a kitten working as both a slave and apprentice when Lady Twenty Four de Sai had pulled off her coup d'etat. The destruction of the bells and subsequent freedom for all nekos is what had allowed her to take charge of the archives from the half-drunk human who had been lazing about in it.
The neko had been both terrified and awed by the thought that a woman only ten years her senior had somehow managed to seize the entire godsdamned empire. It had inspired her to try and stand up for herself, and her service had been rewarded.
All the same, this was the first time that Millie had actually met the demigoddess who now ruled the empire.
She hoped it would be the last.
She paused, frowning and took a half step backwards. She tapped the numbers attached to the shelves, and rubbed at her chin. "This is wrong. There is a missing item, here."
"Warp and weft." Toofy said with an eyeroll and snapped her fingers. The shelf groaned for a moment before the space seemed to roll and stretch outwards in both directions, revealing a half dozen books that had been hidden.
Millie didn't question it, and crouched, pulling her floral dress up so it didn't get caught. She picked up a small black box, engraved on every side and then stood up and held it out to the empress, "Could this be what he hid?"
"Seems like." Toofy cocked her head, "Wasn't expecting it to be fucking enchanted. Bastard. Toofy was never best at languages. Writing on outside, it isn't draconic, or not any that she has seen. Not elven. Bastard."
The librarian took a closer look at the black box and the symbols carved along every edge. She ran her fingers along them, looking at it carefully. "This isn't a language, your grace. Well, not one as you know it. These are formulae."
"Formulae?" The catgirl said, bristling with irritation. "Like... Natural philosophies?"