"If there ever comes a day when we can't be together keep me in your heart, I'll stay there forever."
Winnie-the-Pooh by A.A. Milne is about friendship.
Do you know any other novels on friendship?
The Devoted Friend by Oscar Wilde. The ending is sad but I love the story.
I love Mark Twain's The Adventures of Tom Sawyer and The Adventures of Huckleberry Finn. The friendhsip between Huck and Tom is beautiful. Huck and Jim are friends although they are different. Their friendship is strong.