Any good polyamory stories with multiple family members involved in free use or group sex
"Kelly's Diary" has kind of what you are looking for. Her stories are more long form just keep that in mind. It's a long series so I will try to list some entries:
https://storiesonline.net/s/26728/20100821-my-first-family-sex
https://storiesonline.net/s/26843/20110703-family-boating-day
https://storiesonline.net/s/27162/20120812-my-husbands-girlfriends
https://storiesonline.net/s/27216/20121215-early-christmas-present
https://storiesonline.net/s/27591/20161203-diversity
"Melissa's Secrets" by Pookie also has a lot of great chapters with what you are looking for.
Pete Fox's "Sex Date" series is also great.
Thank you hunterblackchair.
I could not find "Melissa's Secrets". Is that removed from SOL?
"Melissa's Secrets" by Pookie
"Pookie: Stories
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Thanks to all who have given me constructive feedback on all my stories. For those reading my stories for the first time, I hope you enjoy them.
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Pookie
There's a set of I think three stories out there about a couple and a triple (at least I remember as a triple-could be just another couple) that take a trip to Disney World. One couple dissolves, and the girl joins the other couple.
Duaj Writer's 'Florida Friends' series. Several other of his stories as well.
Several of Fantasy Lovers stories as well.
Several of Eros' stories would count, especially My Sister's Family, but note that the stories predate the under-14 rule. If you don't want to read about a sexually aggressive 12-year-old girl you may want to skip them.
https://storiesonline.net/s/32997/my-sisters-family
I'm pretty sure Dorsai had some too,m but the only one on SOL doesn't fit.