You can now engage in erotic and mature conversations with NPCs through the new AI based dialogue system. Characters respond dynamically based on the context/story their personality and the relationship with you.
The girls are completely driven by AI. That means they can see what you hold in your hand, what you are doing with them, were they are etc.
There are not really commands anymore in this mode. They decide what they are going to do or say based on their mood and what is happening.
It also means that the girls don't directly do what you say. Sometimes they need more encouragement or textual enforcement.
Its very easy to make your own AI context by adding an AI text plugin (see plugin/llm directory). You can easily put in your plugin text with your own fantasy context/story.
I think it completely changes the gameplay. Have fun playing!