Do you mean this character? To unlock her scene you need to give her 3 slime and 3 goose feathers at the same time you get them by defeating slimes and gooses... so just go to her when you have at least 3 slime and 3 feathers in your inventory and the scene should unlock.
Not that character, these two characters on either side of the throne. It always shows the penis sign and doesn't allow me to get on the throne. I saw that its supposed to be from sitting on the throne for a while, but I can't seem to sit on the throne.