>>41365736 (OP)
I think I am on to something with the tentacle monster/demon simulation thing. Gematria seemingly confirms it and multiple works of fiction not closely related are referencing it.
'The octopus' in Jewish Gematria cipher equals 666, 'raped in the mind by tentacle demon' is linked with Lucifer, the Devil, and the running of the simulation.
Matrix has Sentinels, Red Dwarf has Despair Squids that induce lifelike hallucinations, Berserk has a tentacle demon called Incubuses that induce nightmares, and Devilman has Mugaruu, a literal tentacle demon with the ability to make lifelike illusions.
I know that this list of fictional works is not a lot, but combined with the Gematria (of which there is more that points towards this being true) and the fact this should be a rare combo is kinda sus. Pretty sus actually.