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As per the title.

Which HH books depict both characters decent from the favour of the pantheon and Horus?

First Heretic iirc. Definitely focuses on Lorgar, cant recall 100% if Erebus gets huge airtime however.
I think he features more in the first 3(?) books.

No, thats his fall from the emperors grace. His fall from grace is covered in slaves to darkness.

Erebus is told to get lost by Horus in Fear to Tread, after Erebus convinces him to try to turn Sanguinius, despite Lorgar being positive that it was impossible.

Erebus isn't really liked by anyone. Even lorgar never really expresses anything resembling liking him, as far as I remember reading. He's the giant turd that no one likes.

jareddm wrote:
Erebus is told to get lost by Horus in Fear to Tread, after Erebus convinces him to try to turn Sanguinius, despite Lorgar being positive that it was impossible.

Horus then proceeds to give him a unique face-lift.

The other book worth reading is "Aurelian". It is a novella and is included in the "Eye of Terra" anthology. It actually takes place within the chronology of "First Heretic" and describes Lorgar's travels within the EoT.