A Scary Thought is written by Wade Tritschler and began online publication on April 16th, 1997. It currently stands incomplete at 51 chapters, the most recent of which was published on May 23rd, 2016.
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What happens when Kasumi is the one coming back from a training trip rather than Ranma?
This little time switch starts many years ago when it was decided to join the Saotome and the Tendo families. Originally the decision was basically left till Ranma was old enough. However, in another probability the decision was finalized then to have Ranma marry Akane. To help the two children on the road to marriage Soun agreed to raise both children, but in exchange Kasumi was to be raised by Genma. Gee, guess what resulted.
When Soun and Genma decided to join their houses, Ranma was engaged to Akane (at age 6 or so). Soun took Ranma to raise alongside Akane, and Genma took Kasumi. On that training trip. She's now cursed, and a good martial artist. On their return, the engagement is switched to Ranma-Kasumi (since it was obvious that Akane would never marry him). A long story starts. Ukyo as a wolf...