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?"
She nodded, "One moment, your grace."
Millie put the box down on a nearby table, and pulled a pencil out of her hair. She also drew a small book of handwritten notes out of her bra and started sketching out the symbols. She chewed on the end of the pencil, considering, and then wrote a few extras.
She nodded to herself, "She doesn't quite understand it, your grace, but she has an inkling. These ones, on top of box, refer to the construction of circles. Ways to measure how big circle is by only knowing part. Like this, it tells you how many paces around the circle is, if you only know distance across the circle."
"Interesting." The empress said, actually lighting up, "Help to design magic circles in theory, yes? Toofy likes. Could help solve issues with bad gateway that needs repairs in east city... Sorry. Distracted. Other formulae?"
Millie smiled sheepishly, "She isn't natural philosopher, your grace. But, they could help her... This side of secret box? Millie thinks they describe measuring inside of shapes. Like how much water can fit inside a box. But any shape for symmetrical things."
Toofy leaned forward, looking at the symbols, "Wanna learn to read. Going to yell at royal tutor. He not teach Toofy things she need know. What does Millie call this?"
"Geometry, your grace. All formulae for this are geometry. Made for measuring things."
"Like cities. Good for planning city shape, and flow. Controlling trade and commerce, protecting citizens." The empress mused, "Mmm... Very distracting. What more can the Millie say?"
"This last set, she doesn't know." The librarian shook her head, "She thinks she knows parts, but it doesn't make sense. This symbol, usually mean time. But this one usually mean the space inside objects. This one usually mean distance. Not make any sense to her."
The empress laughed, "That's because the Millie is not a magus. But Toofy is. These rules... They're protections on little box. Guidance on how to safely open box, because box is bigger on inside than outside. Time and space are part of same weave. She thanks the Millie. Will come back if she has more questions."
With that, the empress picked up the box and walked away.
Millie sank down onto the floor, ears going flat and tail flopping to the ground. She curled up on her side and put her head in her arms in utter exhaustion from the terror of being so close to not just the ultimate authority in the land, but probably one of the most dangerous magic users to currently be alive, barring the Crown Princess.
The librarian closed her golden eyes and tried to practice remembering how to breathe. She had known that it was inevitable that her path would eventually cross with the empress, especially after so many years, but usually the empress sent someone on her behalf, too busy to deal with things herself.
She really, really, did not want to know what was hidden inside the box. The enchantment on it was enough for her to decide it was too dangerous to know about, let alone the magic to hide it on her shelves, or that it was apparently hidden on behalf of a truly horrible man.
The sun peeking through the windows was warm on her, as she lay there on the floor. It may not have been particularly dignified, but the neko quickly found herself drifting off to sleep.
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"Milicent?"