The idea's developed a bit. The two diners used to be involved with the same man, the first woman being the wife whose husband cheated with the second woman. He's since moved on, leaving them both high 'n' dry. The lunch is full of passive-aggression, lots of seemingly nice but actually barbed comments. I've got some of the opening conversation, and hopefully will get down to writing it in full this week. Sometimes stories spill out almost perfectly formed. Other times they slowly emerge and trying to pin them down on paper is like herding cats or catching a slippery eel.
Not sure how this story will end, but I'm certain no squid will be consumed in the process.