"Meanwhile: Albus is fighting to keep Fawkes as a familiar. His putting both Alice and Lily into a coma, almost killing Lily has hurt their bond. He had not meant kill Lily. He is telling her that it is for the greater good of the world, not just the Wizarding or Magic world. He is losing the bond, when he becomes a Grey (dark) Lord, instead of a Lord of Light. He binds her to a slave bond. He now does whatever is needed to do... In his opinion, for the "Greater Good". Evil must not win, or the world will be destroyed.
"Just as his lover Gellert Grindelwald, changed from a Lord of Light to Dark, when Albus's sister died from being raped by muggles. Of course, he was not told by Albus, that he put her into stasis, that she did not die. She was not right for him, Albus was. Maybe with some memory charms, Ariana would be acceptable to Harry, so when Harry dies, she can carry on his line, as well as power. Could use her virginity to power the bond.