This came to me last night. I'm working on too many fics already so I decided
to put it up here to see what someone else can do with it.

The idea:
Shampoo finds out about a real wishing well. Shampoo goes to said well and is
followed by the other feancees. They all arrive at the well at the same time.
In a rush Shampoo, Ukyo, and even Akane make the same wish at the same time.
"I wish I was the woman Ranma loves!"
The girls get their wish, but not the way they expected. In a flash all three
disappear and in their place is one girl. This new girl is the result of the
wish.
The wish took the parts Ranma likes about each of his feancees and put them
together in one person. 

Anyway thats the idea.
James