Oh, the joy of writing.
I sometimes start writing with one intention in mind of where I want to go and before I know it, something else is developing. For all of that I still have to remind myself of this when I feel stuck in my writing. I have to remind myself to just start writing, just let the words come forth, and don’t worry too much about the results. This can be a push sometimes, but if I can push through that block, more often than not the words will come of their own volition.