After little more than five weeks of writing, I've hit the 100pg mark on The Bitter River. I'm also very close to 40K. On Friday, I started writing on the trilogy and thus far have alternated my writing days between the two projects. The method seems to be working, but it is the trilogy that keeps me up late when I lie down to sleep. It's the trilogy that creeps in and whispers ideas to me when I'm awakened at 5:30am by the rain showers. It's the trilogy whose churning will not immediately allow me to fall back asleep. Despite that, when I sit down to write on my historical, the words come without problem; the characters are cooperative.
I don't know if it will continue, but I'm impressed with the way they are cohabiting my brain.