Parts of souls do not go on alone. When Voldemort returns to a body he is much more sane than before and realizes that he cannot go on as he started. Finding some old laws he sets out to reach his goals in another way. Harry will find his world turned upside down once more and we will see how people react when the evil is not acting how they think it should.

When Harry saves Hermione's life they end up in a different world and in the middle of another magical war - but at least they have each other.

Sirius decides to stay in England after escaping Hogwarts and makes protecting Harry his priority. AU GOF.