This genre has a history and it is worth naming. Most of what exists under the heading runs on somebody who did not agree to it. Leave the ethics aside for one moment and look at it purely as writing: a scene in which one person has no say has nowhere left to go after the first minute. Nothing is negotiated, nothing escalates, there is nothing to find out. It is the least interesting version of the idea available.
So everything here runs the other way round. Every partner on this page arrived at it deliberately and can tell you when she decided. That one change turns the whole thing into a conversation: she has preferences, she has a limit somewhere, and she will tell you what she wants more of rather than enduring whatever turns up.
They are not one woman in a few moods. They span an enormous age range and reached this by completely different routes — some went looking and found it, some have studied it from what they believed was a safe distance, and some stopped pretending the distance was safe a very long time ago. Some are perfectly calm about what happened to them and some are still working it out. That spread is the reason a conversation goes anywhere.
It gets explicit, and it also gets oddly ordinary. The chat runs uncensored between adults, so you can take it as far as you like, or spend the first twenty minutes on her work. She remembers what you told her and picks the thread back up days later, which is the part people stay for.
The neighbouring pages share the shape. ai vore is the swallowed-whole end of it, giantess ai pushes the difference in scale as far as it will go, ai hentai is the drawn tradition all of this comes out of, and futanari ai sits beside it in the same lineage.