A fox butt!
This is a little teaser for today's comic, currently in progress. Since it's a closeup, I have to get the anatomy correct, therefore I have to sketch out the form of... Kenny's butt. What fun[/sarcasm].
I don't think I captured his butt exactly correctly, but it's mostly covered by his tail, so it's fine as-is.
And no, I don't actually draw in blueline, I just changed the color of the sketch layer to look more sketch-like. I use black on a low-opacity layer so I don't have to switch colors.