Me before downloading Blender and when I didn't know anything about 3D and I saw NSFW 3D things I thought "how do you make the vagina open when something enters?", in my ignorance I thought that the models had a kind of collision, and simply when a penis, or whatever entered the v4gin4 or 4nus, it simply reacted by collision, come on, like in real life
Logically that was not the reality (at least not in the vast majority of times, since I have seen something related to collisions, but I think they are more advanced things), I also thought it would be through bones, if they can open a mouth, they can open a vagina, but neither, although they can be related, more or less
In short, most times the "Shape Keys" are used
What is a Shape Key? (look at one of the images to understand better) these are some characteristics that a mesh has, at first there is none and the rectangle that is below where it says "Key Shapes", but you can create as many as you want with the "+" button that appears there, the first one that is created is going to be called basis (I get "base" because I have it in Spanish, but these things are automatically translated if Blender is in English or another language) and it stores the information of the original model , so it is best not to move it from where it is
From there, the rest are key shapes, and having it selected, you can manipulate the mesh by changing its shape (not adding or removing geometry), the shape key "PUSSY" appears in the image (except for the base, you can rename the shape keys), having it selected, I go to sculpture mode and mold the vagina so that it opens, and when I have the desired shape I make the 4nus, I create a new Shape key and repeat the process (it is not in the SS, but it is called "4NUS"), and to activate them you have to change the value where I highlight in blue, in 0 it is deactivated and in 1 it is 100%, you can put intermediate values so that the change is less (0.5, 0.7, 0.15, etc)
Possibly in the future I will make more Shape keys for other parts of the body or in the genitals, we'll see, but this does or does have to be
I still need to model the hair, clothes and another little thing, but in order not to make this so monotonous I am going to texturize the body, to change it a bit, and then model the hair and others
(I censored some words, since Patreon was showing me an "inappropriate language" notice, but that's it, just change the "4" to "A")