I've thought about this for a couple of days and found myself incapable of naming one reader interaction that is my fave, because I love them all. So far, anyway ;) I've said it before and I'll say it again: I feel extremely lucky when it comes to my readers. They're the most supportive group, shouting about The Witch Collector everywhere and always sending the most encouraging messages. Reader love is so motivating. It dims the glare of impostor syndrome and gives us authors reason to sit down and bleed our soul to craft another book.
For an author to put themselves and their work in the world for people to freely judge isn't easy. But when we find our readers, they make the bumpy parts of the publishing path a little softer. A little easier to trudge through. Someone out there loves our writing. Someone out there loves our characters as much as we do. Someone out there is dying to read more.