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Can't wait to see this animation software doing gender changes.
Wow so smooth. Why does her vagina pop into and out of view though? Looks a bit odd
Well, the labia, much like the foreskin, is movable, perhaps his glans (bottom of the penis head's "mushroom") is wide enough to pull on her lower lips
I made this in my own animation program that I'm developing. It's very smooth because it's vector based with automatic interpolation. It's a bit tricky to animate lines that aren't visible in every frame with that system though, and I didn't really have the tools to fix things coded at the time, so I just sort of stopped.
I think a good way to do it might be to make everything see-through like you'll see in the next animation. I'll work on layering strategies once I get coloring added in.