I could use some help, I've been searching for a couple of stories and have recently come up empty-handed -
Both involve an island tribe where the largest-breasted woman rules and have a tit-fight centric theme. I can't remember where I first found them.
The first story has a challenger lose, then defeat the current leader by poisoning her breasts overnight.
The second story is based off the first, and has an expedition party seek out the same sort of tribe. This one is much more violent, and culminates in the tribe leader's breasts being seared against the superheated rocks of the island. I specifically remember the term "vomited out" being used to describe her breasts pulling apart as she tried to back away.