Awwww, sorry you're struggling w/the muse versus your goals for the month! Though maybe making a conscious decision to stop fighting it will let you make some progress elsewhere (or might even make your muse decide smut would be all right after all, w/o pressure). & yay for finishing the other fic!

I like the idea of a reward system. I know in the past I've used music to keep me going--if I keep writing for 3 more songs, I can then go take a break/have a snack/etc.! (& then I hope that the longest songs ever don't come up on iTunes ;)

I hope you're able to get some writing down at your MIL's today, like you suspect.