I have, and like Xana am lucky to have some amazing partners (Xana being one of them, xD), so choosing one story over another is akin to nominating a favourite child. They're each different, but I love them all equally in their own way.
However there's one, similar to Fruit, where my partner has been swallowed up by real-life, but I know that she wants to continue if she could. I miss it like crazy, as the way our characters played off each other and the direction the story went in, without even requiring discussion, was perfection. It was as if we had a Vulcan mind-meld, and were intuitively on exactly the same page every step of the way. She's also fun to chat to OoC, so that scene is going to be kept open for as long as it damn well takes, xD