Her flames trail over to Finn's foot and he is surprised to realize that it doesn't hurt as bad as it used to; though, once the flames crawl up his leg he screams in pain and jumps into the water.Once he's out of the water, Finn and Flame Princess hug; although, Finn has to wear many layers of tinfoil to protect himself.He then breathes into her mouth, which causes her to re-ignite.
Finn helps her build a new house in the Grass Lands out of wood scraps, and she tells him that she loves it.
Finn picks up a rock and kisses it, then hands it to Flame Princess who kisses it as well.
In "King Worm" Flame Princess is feeding Finn (whom she calls "honey") soup; first lovingly, then angrily when he hesitates (he was confused, having been with Princess Bubblegum as her king and husband seconds earlier).
She comes to the conclusion that they are opposite elementals and that even if they like each other, they would hurt each other.
However, Finn suggests that they try to make it work and that he can take it.