I’d expected the series to play with parallel storylines– Stan and Xev on Fire, Kai and 790 on Water– for longer, but Kai finds a damsel in distress, the titular May, and before you can say “that makes sense in the context of developing parallel narratives, Prince as a love-interest for Xev and May for Kai,” Kai is off Water and meeting up with the others pretty fast, so that’s the end of that.
We don’t actually learn a lot about Water, and certainly it’s unclear which, if any, of the narratives the characters spin about it are true (May, apparently the Water equivalent of Prince, is no less manipulative). We do learn that Prince can regenerate, and possibly May can too. Kai definitely gets all the lines this episode, but Xev seems to have developed a terminal case of naivete, apparently falling in love with Prince despite him being clearly dodgy AF. I should say, though, that I’m really being won over by Xenia Seeberg’s performance as Xev; she slithers about like a lizard and sniffs people and things in a credibly non-human way.
Finally, the crew of the LEXX appear to have abandoned their mission to roam the universe trying to get laid, presumably because they’ve got enough opportunities where they are.