
yeah, it seems to be hinted that it works better the more physical they are. I definitely think it is sexual. If you think about how the FL looks back at her sexual interactions with him in their past life it is like their sex life was their guiding. Also, when he kissed her before the was intense desire he felt.

I think it's more like an acummulation of tiredness kinda stuff? considering they have been with the esper's side effects from a loooong time in a world that doesn't have guides, if it suddenly appears it's kinda liberating? tho the oh face is too much, but I guess in the MC original world, as the espers get constant guiding they won't end up like that
the guiding face is crazyyy...also hypothetically in a battle, there must be several espers and guides, and espers need guiding during battles right. so it is possible for a bunch of espers to get their guiding simultaneously, which means...simultaneous o faces???? simultaneous horny looking faces??? yall the possibilities are endless