This is a beautiful scene where Tink declares her impossible love to Peter.
Peter just found his happy thought, re-learned how to fly, and re-gained his place as the lead lost boy, all of that thanks to Tink. After a celebration, Peter and Tink find themselves alone for a moment.
I would recommend playing the scene as if Tink was human size the whole time. Get creative with the scene to make the "You're big" line work. You could either replace "big" by "beautiful", or move the lines at the beginning. Remember to always bring the scene back to what is concrete, even when there is magic. Make it extremely simple for it to work for yourself as needed.
And, as always, read the whole script for context (and clues) about the relationship. No scene is an island. Making it concrete will only make it better! Also, avoid watching the movie. That will ensure you give your own interpretation of the scene. Lastly (and most importantly): have fun with it!
Download Part 2 of the script on AwesomeFilm.com (The scene is on page 96)
More like this one on Simply Scripts