serrico wrote a short Lionel-Martha piece
here in which Lionel reflects on the difference between surface and substance when it comes to Martha Kent. Only about ten paragraphs long, and still one of the best pieces of Lionel characterization I've ever read. I highly recommend it.
And can I just say, I LOVE that my 400th post is a Lionel rec. Really, since she wrote this story based on a prompt I gave her I'm considering it an early birthday present.