Look I get the whole steam thing with the younger sister but I was just giving you a real lore reason with her schizophrenia being the reason why we can't get with her, like it makes her mind resistant or it becomes a new personality for her. You already established the dolls magic can't be resisted, then the sister should be effected too. Since steam has you by the balls now and it was obvious that little sister was going to be the dolls new vessel. You'll either need to either remove the sister all together or provide a new target as the vessels but that means you'd have to rewrite why your family is going into debt. If steam wasn't an issue then the doll using the sister as vessel would probably lead to the doll also being effect by the magic allowing us to get with the sister both before and after possession, since the dolls new body couldn't resist the magic it would still be effected. All of this just sounds to me like this game will likely be abandoned due to game lore restriction and writing yourself into a corner with no escape.
