This is really lovely--River's voice, and the joy she takes in proving she is a person and not some kind of prototype, and Luke's wonder and acceptance of it all.
There are so many things I love about this story; the cut glass purity of the conversations between River and Luke, the different ways that Luke interacts with the people he loves, and the brilliant way you've drawn the similarities between Luke and River. Oh, it's really all extremely lovely. Thanks for writing it!
Love it. River would truly like Luke's innocence.