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I think for practical purposes, the best way for what you describe at the end of your post would be to use a pseudo-AI within the loader and mods that already exist. You could use buttons as input instead, and characters can still remember feelings etc. already. I find myself telling these chat bots the same things in sex situations anyway, so a few simple button messages that adapt to the situation would do nicely I think. This way there is no need to interpret and replies/action responses will always make sense.