I should probably explain the options a bit more, as I did kinda simplify it.
1) outright possession. We let Kitty take over Amalia.
2) Refuse to negotiate
3) Lie to the father that Amalia is dead
4) Force the father to help us fight Kitty
5) Promise to set Kitty free but she cannot have Amalia, keep to that deal
6) Promise to set Kitty free while telling her she cannot have Amalia, let Kitty bribe us to take Amalia
7) Betray Kitty by promising to help, then killing her
The way I see it, most people are voting for 1), but some of you may prefer 5) or 6) or feel that maybe double-crossing a desire demon is a fun game. Just letting people tailor their choices more effectively.