If you still haven't tried out some wax watercolor pencils, I recommend you sincerely to try them out.
I bought several of them last year ( Koh-i-noor brand) and they are called just like that - wax aquarell.
They don't act like regular watercolor pencils since the wax gives them smoother lines and richer pigment.
Here I used paper for acrylic. They are bit stronger structure than watercolor ones and added a thin layer of gesso so the surface become a bit greasy. It gave beautiful result since the watercolor made nice puddles.
Wax pencil becoming wet made nice stronger areas, but still some lines left untouched.
If you are interested how this drawing looks like as a digital creation you can check it here
https://makersplace.com/jung/moods-1-of-5-25022/
Thank you!