SCG,

You might use the story search function to answer your question. It's at http://www.bdsmlibrary.com/stories/search.php. In the section on "gender codes," mark "no" on anything with the letter "m" to the right of the slash. That eliminates any story with a male as the object of action (i.e., the "victim"). Mark "yes" on anything with "f+" to the right of the slash. That targets stories with multiple females as the object. You might increase the probability of finding a lesbian-themed story by selecting items with "f" or "f+" to the left of the slash as well. Do the same with fetish and consent codes. So, for example, "f/f+ d/s nc" would target those stories in which one female forces two or more females into submission without their consent.

If you find one good story, then click the author's name to see what else s/he might have written.

Not perfect, but a start.

S.