Your little sister Rasazy is fed up with you teasing her about being small. So she tells her mom Sarvenete and she comes up with a plan to help her get back at you. The way Sarvente does so is by granting Rasazy the ability to increase her size, which would also increase her assets and her figure in beauty, but the height has a max of 50 meters. This way Rasazy can now tease you about being small and toy with you until you apologize for teasing her.