Twin Portals

The concept of portals is common, but what made the author choose to link two specific worlds in this way? Did the story's magic system evolve from this idea?

Their mysterious nature kept me guessing, but I wondered if their secretive behavior was meant to build suspense or hint at deeper motives.

The lighthearted moments provided relief, but I was curious if there was a deliberate choice to keep the tone from becoming too dark or serious.