Presumably the demon has to keep a complicated model of a fictional world in its head to make sure the subject has matching experiences over time. Every time I return to Australia or visit an old friend, my experience needs to be consistent with previous visits. The demon will also need models for places I’ve read about and places I’ll eventually visit, as well as everything I read about in newspapers or watch on TV. The model will have to be constantly updated. This will be a lot of work, although perhaps the work is nothing for an all-powerful demon.
