Birthday Card - Cock Spurt

I've been thinking long and hard, figuratively speaking, about how to describe this one.

I knew what I wanted to draw but my imagination isn't great, so I needed a model of some sort.

Needless to say, I had to draw it very quickly at exactly the right time, which took many attempts to get it right, which in itself was hard work for someone.

I'm tempted to explain the subject positioning and drawing angle, but I don't know you well enough to go into it.  When we know each other a little better, ask me and I might tell you about it.