I am pro-transformative works as a matter of principle, and I don't believe permission from the creator of the source work is necessary before creating them. However, for anyone who would like to have it, I give blanket permission to create any kind of transformative work based on mine, including all my works archived on AO3 as well as those posted elsewhere, whether fannish or original.
Please credit the work of mine that you used, preferably with a link back to it. If you create a close transformation, such as a podfic or a translation, and you alter my text for your purposes, for example by abridging it, please state that you've done so. I would love it if you would also send me a link to your work so I can squee over it. :)