It is Chapter 26 when we are given the clearest indication of how Huck feels about Mary Jane, and interestingly this also marks an important stepping stone for Huck's personal development concerning his sense of what is right and wrong, because he finally stands up and acts for what he thinks is right, instead of just observing passively the Duke and the King and their scams, and acts to help Mary Jane.
In Chapter 26 Huck feels increasingly uncomfortable because the girls of the Wilks family are so nice to him. Although Joe begins to doubt Huck's ever more fanciful descriptions of life in England, after Mary Jane rebukes her for her treatment of a guest, Huck is shamed to see how good Mary Jane is. Note what he says after this episode:
I says to myself, this is a girl that I'm letting that old reptle rob her of her money!
Huck goes on to describe their behaviour towards him:
And when she got through they all jest laid theirselves out to make me feel at home...
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