>>90115343Being the oldest and designated babysitter for the rest of her life.
She probably didn't mind it when Leni was born because she's able to be a proper older sister for someone who's so naturally stupid. I think she at least tried to get used to Luna and then reached a boiling point when Luan started getting her slapstick schtick off the ground.
Luan must have been a huge menace to everyone as a kid, if that April Fools' episode was anything to go by.