Biting off more than I can chew?

[bktheirregular]

I'm finding that as I do snippet work - building the skeleton of the story I'm trying to write - I'm starting to write another story at the same time. Taking place probably two hundred, two hundred fifty years earlier. In the same 'verse.

Do you call them prequel and sequel if they're written at the same time?

Or do you just call me mad and ignore it?

:)