Normally I never write prose. After much world building I now feel the need to. Ever since I resolved to at least pen down a draft, things get curiouser and curiouser. For when I sit down to write a short scene, I start doing so in English, which is my third language. I don't know why that happens. Perhaps I read too many English works lately, or I subconsciously associate fantasy with English, or I don't want to write I in the ornate poetic style I've cultivated in both Greek and German. I doubt that I will ever publish prose. Should I force myself to refrain from writing in this foreign language, that will certainly make me commit a hundred silly mistakes, or is there any reason to go with the flow and perhaps change it later?
Edit:
The way my poetry "happens" and which I now apply to my first prose draft is the following: I receive a stimulus, often music. Then I sense I have to write a poem and that feeling is accompanied by a special feeling of discomfort, which only goes away if I write the poem. At some point a sentence forms in my mind and I start writing the poem with only a vague sense of how it will look like.
Now pretty much the same happens with my draft, only that the sentence which forms in my mind, the seed if you will, is in English.