[He's right that her intentions are not malicious, but she's already holding out her arms again for the book, expectant and excited all at once... And by consequence, simply loathe to let it leave her touch in case it disappear in a shower of golden light much the same as the Servant himself had. Besides, she wanted to show him a particular page!]

He is here in this place- though not in the form of flesh as we are familiar, more as a spirit whose existence is supported by magic itself.

[Whether that magic is given apparently in the form of spells or... The innate magic of the giver sealed into their blood and... Other fluids...

Nevermind the dusting of pink on her cheeks, though it's an expression Sebastian is likely (unfortunately) all too familiar with.]

When he came to call I was left with this precious tome-

[And a new, very ill advised crush...]