AU The Fault In Our Stars where Hazel Grace succumbs to the cancer and dies and in the last scene all you see is Augustus standing out side with a cigarette between his lips and a hand slowly reaching up to light it.
BUT THE ACTING HERE. BECAUSE HE’S DIGORY. AND HE BUILT THAT WARDROBE. WITH THE WOOD FROM THE TREE HE PLANTED. AND SO HE KNOWS IT’S NARNIA. HE’S WAITED HIS WHOLE LIFE, AND HE’S PROBABLY GIVEN UP AND SHOVED THAT HOPE AWAY IN THE BACK OF HIS MIND AND SUDDENLY THESE FOUR CHILDREN SHOW UP AND THEY FIND IT.
Fun fact: CS Lewis based the professor on JRR Tolkien. Tolkien in turn based Treebeard on CS Lewis.