[Marriage. It was something that was not part of air nomad culture, but anything like that excited Aang. This also caused a realization in Aang: what if Katara expects the same thing from him? He hadn't really considered their relationship beyond the simplicity of being together. Although, being back to square one with this Katara gave him much time to mull it over.]
[Action]
Sure! Wow, you guys really have grown.