The knock echoed throughout the library, telling Patchouli that her guest had arrived; the door had been enchanted specifically to produce that effect. It wasn’t an enchantment that Patchouli usually kept active, as most of the visitors to the library were residents of the Mansion and had reason and every right to come and go as they pleased, and so had no need to ask for admittance. Others, such as Cirno, simply entered directly from outside.
Today, though, was different, as Eirin was not a regular visitor. And, as Patchouli had feared, she was on the other side of the library when Eirin arrived.
Whispering a quick spell, the mage levitated and rocketed up over the chasm that was the Voile. During her century-long illness and residence in Gensokyo, necessity had demanded that she become a very good flyer, both to dodge bullets and to move her weakened body about. Her recovered health let her walk again, but she hadn’t let that keep her from continuing to master flight.
She reached the apex of her arc and began to come down. She approached her landing spot, on top of a large bookshelf. As she came in contact with it, a magic circle opened and she launched forward again. This was enough to take her all the way to her destination: the main library entrance.
She arrived right as Sophia was opening the door to let Eirin into the library. The devil bowed to the Lunarian, and Patchouli landed. She brought herself up, and then gave the doctor a courtesy.
"Lady Yagokoro, welcome to my library," she said. "I am honored to have you here."
Eirin was not left waiting long in the hallway, though she did not really expect to, as the door soon opened to reveal the library’s master greeting her. The greeting, however, was indeed outside of her expectations. Despite what little she knew of Patchouli’s history, the doctor had almost anticipated a much more casual affair than the woman’s mannerisms implied.
There was also the matter of Patchouli’s clothes settling into place from movement more rapid than the graceful pose. Eirin could only imagine that she had hurried to the door, despite showing precious little sign of haste otherwise. That information was not particularly relevant, but it did give the doctor the impression that her presence was more readily anticipated than she had first imagined. In the end she returned the curtsey with her own low bow.
"Trust me in saying that I am honored to be hosted in such a way, Miss Patchouli. It truly has been some time in the making to arrive here, and I am glad that we were able to arrange it." Despite Eirin’s predisposition to a casual visit, she had admittedly observed at least one formality in her preparations. As she straightened she reached into the bag at her side and took hold of something that she soon brought forth.
"It is my understanding of western houses that one does not entreat the presence of another without some sort of small token, so I have brought you this. It is a primer on youkai physiology and anatomy, covering the common types in Gensokyo as well as a few more rare individuals. I developed it in order to properly train some of the rabbits and my assistant, so I took the liberty of making a copy of the manuscript to bring to you as well. It is not a thing of great impact, but at the very least I could surmise that you would not already have one." Despite Eirin calling it a primer, the bound paper pamphlet that she extended was of reasonable thickness. With a slight smile she added, "beyond that, I am subject to your whim."