I think that the absolute worst question that you can ask a writer (or any creative person for that matter) is, "What are you thinking about?"
Now, I don't know about you, but I have a hard enough time explaining the basic schematics to a given story while I'm writing it, let alone explaining what part of the story I'm currently working on. Shoot, I have enough problems just trying to explain what a story is all about after its done, but that's another issue for another time.
Back to the schematics. Most, if not all, of my free brain time is spent mentally working on my latest story "Dandelion Tears", either by thinking about how to move the story further along to its ending or by thinking about how to get from the beginning of one particular point to the end of that same particular point.
Example: In part one, I introduced a particular characteristic for my two female leads, Melanie and Fryja. For Melanie, I introduced the characteristic of bloodsucking, although I have not identified her with any particular non-human species, nor anyone else for that matter except her human husband Jon. For Fryja, I gave her a servant/lover who gets his periodic energy boosts from sucking on her boobs.
Yes, I said, "boobs".
And no, I'm not trying to turn this into a gratuitous sex romp through the park (although everyone here apparently knows me too well). I'm trying to turn this into a legitimate characteristic and sub-plot point.
I'm sure you've heard of breast feeding and lactating, right?
Well, I'm sure you can imagine what a non-follower of my blog's reaction would be:
Them: "Whatcha thinking about with your story?"
Me: "Breast milk."
Them: takes a couple of steps backwards and says, "Ooooooookay."
Me: "No really. One of my main female characters has a lackey/lover who gets his energy boosts by drinking breast milk, so I'm trying to make that character have a condition in which she's always lactating and needs a way to get rid of the excess. Get it?"
Them: takes a few more steps backwards, and says, "Ummmmm....yah."
Yup, that went extremely well.
So as you can see, whenever someone asks me what I'm thinking about, I never go into much detail beyond, "My story. I'm having a difficult time with a particular plot point."
Because trying to explain how breast milk and breastfeeding became a key plot ingredient to a story without making yourself look like a sick puppy dog, is about as easy as floating down the river with cement shoes.