Grr. Argh. Plot Bunnies

[amberfocus]

Why is it I get these overwhelming, fully-fledged plot bunnies when I am desperately trying to work on other stories? When I am trying to finish fics that have been on the back burner for far too long? I'm not even sure what to call this one. AU? Fever dream? Nightmare? Alien plot? All of it? Stupid TTU prompt. It grabbed me hard and doesn't want to let me go. Normally I wouldn't mind so much, but it's massive and it doesn't want to be wrestled down to the nice, neat size of a one-shot. In other words, way too big for TTU. *grumble grumble*