a dreamwalking scenario sounds good, i like that one! maybe merlin somehow dreamwalks across universes into gbf and belial is annoyed because he's supposed to be the one who harasses people in their dreams but also kind of interested because white haired pretty boy who shares a voice actor with his precious lucilius.

it'd work for both a shorter thread and something more long-term spanning multiple visits, if that's something you'd be interested in. :>