Are there any stories where the husband gets shared? I prefer if the women don't engage in sexual activities and absolutely no incest. A hypothetical setting could be sharing husband so that the wife's friend could get pregnant.
As others have pointed out. Women shouldn't engage in sexual activities between themselves.
Look at https://storiesonline.net/universe/1047/personalia series, quite a few of the stories meet that criterion. Also from the same author the https://storiesonline.net/series/1348/reginald series where all the stories do.
Ian
ETA "the women don't engage in sexual activities" well, apart from with the husband, of course
ETA 2 Some of https://storiesonline.net/a/Gordon_Johnson other stories also qualify IMHO
It might be worth looking at Stangstar06's oeuvre. IIRC, some of the cheating wife stories have the cheater readmitted as a sort of second wife to the new encumbent after she's served an adequate penance.
AJ
Death By Fucking by Andrew Wiggin. Only two strictly hetro women who share the same man, I'm not sure if they are formally married, but later they also share him with selected other hetro women. There is an incomplete sequel dealing with their children.
< sigh > Now I'm inspired to reread it picking quotes