I'm not a hundred per cent sure that Mathys will doesn't have a 'please burn everything in this bookcase' bit the same way some people have a 'please delate my browser history' friend.
And the worst thing is, the "Extensive and esoteric collection of romance and smut of all kinds, up to and including Druchii and Skaven" isn't even in the top 5 weird/unexpected/"Oh Shit" things in Mathilde's home. Like, there's:
Half a dozen skulls of Vampires she's either directly killed or contributed to kill (of different kinds, even! We only lack a Lahmian!)
A room specifically designed for a Dragon
The still cold mask of the Warboss whose half-a-million-orcs-strong Waagh Mathilde personally annihilated
The anti-glowing Dwarf-Wizard superweapon harnessing the power of a God which she used to annihilate the aforementioned half a million orcs
The bottom half of Drycha. Yes,
that Drycha.
A small wooden figure of herself, for some reason
A complete collection of coins from Tylos, Strygos and Nehekhara which would make your average numismatician start frothing at the mouth
Doctor Quirin Waramunt himself, who also turns out to be a former Skaven commander
As of right now, eight brand new Orbs of Sorcery (one of each Wind) which nobody knew existed
And last but certainly not least, the
original Liber Mortis. As well as the Scrolls of Zandri. And handwritten notes by
Vlad von Carstein on his Ring, which apparently was made by Nagash himself.
Yeeah.