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About Nui and "boobs filled with non compressible gas", here is what big natty boobs should look like (take notes, illustrators)
>pic related
They follow gravity lines (dropping towards wherever the center of the Earth is) and they deform when in contact with a tight fabric.
Boobs drawn as if they were baloons, pushing the bra out with the same curvature as if they were not compressed, and pushing up even when gravity is pulling them down is a mark of people that did not study enough live models