Thankfully I needn't have worried.
Now that someone has asked me to write a sequel to Kongomato, I put fingers to keyboard expecting nothing to happen. I even went against the grain and began to plan the novel, which is something I never do.
But the second I began typing, a new and hopefully exciting twist occurred to me. So I just went with it, and before I knew it I'd typed five thousand words. Admittedly they were full of mistakes and really cruddy spelling but I never do anything about that until I've finished the whole chapter.