What do you think can make Nalu fully reach it's potential like who or how will make them confess to each other?

Suggestions (you don'y have to choose from here, let me your ideas.):
1)Lucy confesses first
2)Natsu makes a funny, touching confession
3)two of them alone facing a trial
4)Lucy almost dies for some random situation
*note: ALMOST
5)Natsu needs to save Lucy from her depression and finds out she has always thought of him as the ray of hope to her life and get touched and embarrassed
6)make them play Romeo and Juliet
And i'm out of suggestion.:(
Now your turn.:)