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The Dark Lords' dreams -- both Dark Lords, that is -- are about to come true, thanks to ... their Librarian?
Dark Lords Thomas Voldemort and Salazar Slytherin have been soulbonded and sexually involved for over three decades, despite the fact that Salazar is trapped in a magical portrait and they have never touched. That is, until a little Death Eater Librarian determined to earn a little respect completes a self-appointed quest that has entirely unexpected consequences.
This is het and slash and multi.