Huge Transformation FMG (Patreon)

While the 5'8" (172.7cm, 1.7m) tall clothed woman was growing muscles larger than any woman in history, she didn't even notice at all, as her attention was entirely captured by the huge woman in front of her growing to a giant 12'6" (381cm, 3.8m) height.

This piece (and the non-FMG version of it) was actually inspired by this story: https://www.deviantart.com/chimeracore-llc/art/Killer-Ambitions-Part-1-932295871

It's about a tiny woman who gets her DNA spliced with that of an orca (killer whale) and grows to immense sizes. In height, bust size, and muscle. She also takes on various orca characteristics, which isn't really my thing, so I didn't include any of that in this piece. The large woman's height starts in this sequence at around the height of the story's protagonist at the start of the second day of her transformation, while the final 12'6" height is the height she achieves at the end of her transformation in the story.

This girl is also by far the largest I have created to date. Also, for some reason this scene is super fast to render, so I did the full sequence from 2 angles.