It was first-person and basically as I said, I think it was based on a line at a campground on like a Fourth of July-esque night of celebration. A kind of ‘regular dad’ husband with two girls is the protagonist. He starts talking to this wise-cracking older woman but her comments start getting more lewd and stuff escalates and she at least claims that some other guy in the dark is feeling her up, and she asks the dad character to put his hand in her pussy to block the guy’s entrance. There’s a commotion because a pretty, newly married girl’s husband is passed out drunk, and the three other women do hot stuff and kind of coerce the other two into both having sex. Some quotes I remember were, after one of the older women blows the guy to prepare for the young newly-wed’s body, she says “mmm… she’s going to love it.” And in the beginning when people on the line are talking about the passed-out drunk husband, the older woman says “just throw the corpse in the fucking river” jokingly. The guy talks about afterward like “it felt like a dream, but it wasn’t a dream,” and laments that if his wife found out, “my wife kicking me in the balls and threatening a divorce”
It was absolutely stunningly written and is probably the best piece of erotica I ever read, I’d love to find it again