GTS-69 was an experimental cure for Dwarfism, but GTS-69 mutated into an airborne virus, and now infecting women worldwide. Any girl infected by GTS-69 will grow drastically bigger in size, causing them to become giantesses the size of skyscrapers, mountains, cityscapes, or bigger. The growth process from GTS-69 is painless and very enjoyable for the girls who are growing. Girls infected with GTS-69 become playful and destructive, feeling a need to grow even bigger, and for giantess supremacy.