(June 3rd Update: The second butterfly emerged today- one week after the first).
We placed a small container of water in the house and let the butterfly dry its wings for a while. Then we opened the house to let it out. I gently placed my hand in front of the butterfly and let it crawl onto my finger. We didn't try to touch it in any way- I just let it crawl on me and stay as long as it wanted.
Check out the beautiful pattern on it's underside.