Philip Birk looks for fanfics:

Sounds like you are looking for Richard Lawson's two SM/Ranma crossovers

Here are the entries for those fics in my index (at
www.rakhal.com/ranmalst.html)

Title: Out of Sync
File: Not stored in the Ranma Archives
Author: Richard D. Lawson (sterman@uswest.net)
Webpage: http://www.sterman.org/
Crossover: Sailor Moon

Jadeite is dead, trapped between dimensions. He's bored. But he's also
got
a lot more power now, he's been able to absorb the energy of most of the
rest of the Youma and Beryl as they die. Unable to escape he brings the
Sailor Senshi into this dimension with him. Along with a bunch of youma.
And a teenaged boy called Ranma.

Sequel: The Price of Heaven
Complete 52pp
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Title: The Price of Heaven
File: ranma.sm.the-price-of-heaven
Author: Richard D. Lawson (sterman@uswest.net)
Webpage: http://www.sterman.org/

Ranma is in the dojo one afternoon, when a polite black hole opens up,
inviting him to step into it. He is needed in Crystal Tokyo, where a
menacing black cloud is floating around, zapping citizens.

Prequel: Out of Sync
Complete 51pp
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Hope this helps
--Rakhal