Draco pulls his legs up crossed on the end of the bed with an encouraging nod.

As Billy's explanation progresses, he can't entirely help his amusement. "Clearly not nearly as much as you. Never gave it much thought until I arrived here, but obviously it's been on my mind rather a lot since. It's strange, the magic feels all wonky and twisted sometimes, but then at least it still works."

He's a bit curious about the finer points of universe hopping, but also- "That sounds quite exciting, although... somewhat terrifying. Multiverse is definitely a new word."