No one says you have to sketch with dry pencils on dry paper and then wet your drawing. Wet your paper first if you like (soak it in a tub to really saturate it), then draw on it for a soft, lively, unpredictable line. Be careful not to tear the paper as you draw; it’s more delicate when it’s wet.
Another way to work dry-into-wet is to make dots with the pencil’s tip for a pointillist effect.
These color samples show three different pencil brands drawn into an area of wet paper. I first mopped the paper down with clean water and then drew from left to right, directly into the wet spot. Note how the lines soften and change in color due to the wet paper.
Another way to work dry-into-wet is with dots from the pencil’s tip for a pointillist effect. In this example, at left I first wet the paper with clear water and then made repeated small marks with a variety of pencils and crayons. The small grouping on the right was done in reverse, by first making the dots and then wetting the paper. Notice how the dots are less emphatic, paler, more blended and not really as interesting.