Once that is done it's time for some of my favourite techniques. I don't think you'll like it that much, it's kinda of minimalist. However, the penis responds well, in terms of precum production, when stimulated from full and partial strokes to tincy-wincy touches and back again.
So now you must lick two fingers and use them to make tiny circles on the underside of your shaft. Keep making those small, light circles all the way to the tip and back again. Do this 30 times on 4 sides of your cock, (e.g. underside, left, side nearest, right.)