I do use GDocs for its cloud features; its the easiest program for me to use on my Windows computers in my office, my MacBook at home, my iPad, and my Android phone. If I pretend my phone doesn't exist, then hosting all the files in my Mega drive looks to be the most viable solution. Once I'm done writing, I copy everything into the RenPy text editor on my working computer and then work on the code that way. I write my script in such a way that I can easily convert it to proper RenPy code
Thanks for your suggestions, though!