Hi! I saw that nobody has replied to your post about this yet, and while I'm not one to like collaborative writing, I wanted to direct you to some different sources on the site that do have this and ones that'll probably get a person to write with you faster than just a forum post. There is the Double-Trouble Writing Roulette which is apart of the Storybook forums where you can find a writing partner. Not only this, but there's clubs/1952/forum which is similar to the last one I linked. And finally there's the Storybook section in itself which has to do with many people collaborative writing. I hope you succeed in finding a writing partner!
I wonder if people felt the freedom in our culture to love louder, if they'd be quicker to say "I miss you" when the absence of someone is felt instead of just thinking it. — soundofmind