Definitely a most interesting and unique start to the story. I can see a Hermione who's immersed herself in muggle fantasy doing just what she did when Harry rescued her (and even muggle fantasy may well have a basis in reality that the wizarding world has not realized or forgotten about). In any case, I loved the bit about Harry's ancestry as it makes a bit more sense of his father's animagus form. It's interesting to see that both of them have Sidhe ancestry; I have to ask if all who have the ability to work magic have such ancestry or if there are other sources or occassional "sports" without any such ancestry, no matter how removed?
It will be rather interesting to see how this bonding the knowledge of their natures changes things to come.