Artistic discussion #3: "explicit content" help.

[Relent<]

I've recently been messing around with some more adult themed /m pictures, and I've recently taken a commission to do some illustrations for the "Yvette" story by feathers_girl, but I never dabbled so much in this field, as far as drawing is concerned. In the illustrations, it is pertinent that I draw a man's member being feathered to a point where it is producing profuse amounts of pre-cum.
Let's just say, I'm not one for portraying bodily fluids, but in this case, I deem it necessary. How would I go about animating such a thing in a realistic and tasteful manner?