"Anything?~ How very accommodating~" Sin mused in a teasing manner. She also had no issues being serious, but after a full ten or more millennia being duty bound, she came off as a bit more fun seeking than serious. Of course, she held a certain amount of curiosity about the nature of the world, and even the previous one she lived in. She didn't know a lot about the Void either, other than of course its basics, so she had no issue learning and she was a rather quick study.
According to Anos he was rather excited to potentially see the armory she'd created when pulling his castle back together. A grin spread across Sin's face, she didn't currently have it in her to be as coy as she should be. "Oh? I can't really wait either... it's going to be great~" she mused. It didn't even matter that she didn't fully remember constructing the place. She knew that in bring this castle together she'd done something quite invasive. She'd made it a living shrine to her admiration of Anos. A girlhood dream become reality was this place and each and every piece of it hinted as such, not that she'd be admitting such a thing.
Of course, this would only become more obvious as time went on. For instance, the locking mechanism on the door was seemingly understood by Anos and called excessive. She'd gone without fully explaining that she'd moved all of his personally written manuscripts into a private space, not only because they were powerful, but simply because they belonged to him. "I am surprised to hear the words excessive and delightful to used to describe a singular thing..." she said as she observed his ability to use the locking mechanism on the door. It functioned as she intended for it to, and as such she could only be happy about the outcome. And once they were inside this equivalent of a cozy study, she felt the pulse of tomes written by Anos. It made her skin tingle gently and had those hearts in her eyes opening only briefly. 'These are all Anos' books!~' she could have let out an excited little utterance, but instead she made her way to the most extravagant and largest tome to exist. Something called Origin Magic which was large enough to make her torso look small and had pages heavy enough they couldn't have been turned conventionally. "Hoh? Origin Magic seems to be quite fickle about who gets to know it~" she mused as if the subject matter itself was alive. She didn't truly know if that was the case, but it wouldn't stop her from running her fingers along the spine and cover of this large tome.