Depending on which features you need you might want consider using a desktop wiki. E.g. Zim
Outliners would be
I've decided for the time being I'm gonna take the "it'll do" route of writing it in a note editor type app and then just typing it back out when im on my computer again. This doesn't work too great with plain text editors, so I came across a tree-based editor called Notecase, which seems to do the job nicely.
I'd still like to know if there's any kind of proper equivalent to Twine or even if there's an android "port" being worked on at all, though, since I feel it'd be a neat idea.