This entire scenario is something that I am secretly wanting to do in all of my stories, but somehow resist in most of them. That is assuming I understand you correctly, where the sexfight is so exciting they go for each other, as opposed to going back to their men or the man they are fighting over.
Here are those stories of mine that fit that description. Organized from most like what you mentioned to least but still ish.
War on the 85th Floor: War on the 85th Floor by Rival’s Rapture – Fights.Sexy -- Sexfighting and titfighting.
Ewa vs. Bri: Ewa vs. Bri by Rapture’s Rapture – Fights.Sexy -- This is a vicious catfight, but there is lots of tribbing (sexfighting) and titfighting in it.
A Christmas Wreck-oning: A Christmas Wreck-oning by Rival’s Rapture – Fights.Sexy -- This one is a little askew. One is with a guy, and the other is the guy's sister.
To the Last Breath: To the Last Breath by Rival’s Rapture – Fights.Sexy -- Again one guy, but they are fighting over him.
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