If Tidus talks with Lulu after Yuna enters Seymour's mansion, when talking to Lulu a third time she will say "I shouldn't have to say this, but don't fall in love with her [Yuna]". Replying "Too late" will increase Yuna's affection value by eight. Replying "You're more my type, Lulu" will increase Lulu's affection value by eight. Watching Kimahri leave the item shop will increase his affection value by six. After defeating Ginnem's Yojimbo in the Cavern of the Stolen Fayth, speaking to Lulu in the Farplane will further increase her affection value by eight.