Kevin received Luna's gift as he was gathering his things for their trip. He was in awe of the notebooks, and the letter was very fitting. He took the time to pen a reply before they left.
Luna,
Thank you, love. It is amazing, isn't it.
How could I not forgive you? You had a very valid reason to go, and I cannot fault you for it at all. And you have never been Loony to me. You will always be Luna.
Fun is definitely in store. I'm being taken to America to see a large museum dedicated to a favourite type of Muggle Music. I think having a day away will do wonders for me.