Ultimately, Sookie and Bill don't end up together — at least, not physically. While Sookie opts not to use her waning faerie light to end Bill and thus lose that part of herself, she still kills him, fulfilling his wish. While straddling him in the coffin buried for him during his human life, Sookie stakes him, and he explodes into a bloody, gooey mess. It makes a little hard to be sentimental, but like that, he's gone. And like he said, he and Sookie are both free.