Hmmm... I actually had an idea to that effect:
Fukufics - Nabiki and Makoto-an unorthodox SM crossover idea
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viewtopic.php?t=3995As for Ranma breaking away... there are 100's of such stories... far less so with the two sisters though.
Ranma/Nabiki
- 'Goodbye is Not Forever' by Coutuva
- 'Ice to water'-'The Melting Process' by Ryouga's best friend
- 'No Need for Destiny' by Innortal
- 'Out of sight, out of mind' by Turbanator
- R-AA 'Neo-Were-Cheetah' by The Demented Redhead
- R-AA 'Section 19' by The Demented Redhead
- R-HP 'Hikari no Daija' by Miriani
- R-MULTI 'Sic Semper Morituri' by Daniel Jess Gibson
- R-NGE 'Alternate Future' by James Lee-Bloody Paintbrush
- R-SM 'Can't Go Home Again' by Innortal
- R-SM 'The Reborn' by Innortal
Ranma/Kasumi
- 'Home' by grookill
- 'One Trick Pony' by beartooth
- 'Only You' by Tsunami-Saotome
- 'Tattered Mist' by jade-0rchid
- 'Well After Christmas' by Siaru
- R-MULTI 'The Slush File' by Tamojin-Jeffrey Vasquez
- R-PTEACH 'Half a Sleeper and Half an Alien' by migele
- R-TM 'A trip to self' by Alexander Fields-Trugeta
Kasumi
- 'West Bound and Down' by Driver Jim Ohki
Nabiki
- 'Full Ranma Panic' by Calamity-Queen of Cordite
- 'Ice Queen's Rebirth' by TheGrum
Ranma/Kasumi/Nabiki
- 'Unnamed Idea 39' by Brian Drozd
- R-MULTI '1 War - 3 Sisters' by A Brown-Nighthawke
- R-MULTI 'The Goddess Dilemma' by Driver Jim Ohki
- R-AA 'Pokegirls T I T S' by Multiple
- R-AA 'Pokegirls Tendo Taming Haul' by Multiple
Ranma/Nabiki/Kodachi
- R-XCOM 'Dead Man Walking' by Ar-Kaos and sequel arcs...
Runner up... Kasumi will be, if the story ever continues:
- 'Ranma Kingdoms Invasion' by Sargon Dorsai
Runner up... Ranma/Nabiki sort of, Ranma has own apartment, Nabiki gets out to see him from time to time.
- R-SM 'A New Guardian' by Jaxom
Runner up... Ranma/Nabiki, attempted, succeeded for awhile, then NWC followed and eventually caught up
- R-TM 'Chains of the Past' by ShadowHunter2000
Runner up, Ranma/Nabiki/Kasumi, sort of
- 'Red Eyes Fury' by Animeprime