Ten/Donna Turn Left story
I'd like to see a version of Turn Left where the Doctor finds out that in order to get from the parallel universe Donna had to kill herself, because Rose put her to far away from herself for anything else to work. The Doctor notices though in listening to Donna talk about the parallel universe that every other time Rose was able to end up exactly where she wanted to go. How would that have changed how the Doctor felt about Rose? How he felt about Donna, knowing what she was willing to go through for him? Would this change how the Doctor chooses to save Donna at the end of Journey's End? Would he still leave the human Doctor with Rose? I'd like to see the Doctor and Donna ending up in a romantic relationship, but I'd love it if the Doctor fell for Donna first.