Take what you learned from your Renaissance Art class: play with levels and perspective. The background features two small mouths diligently licking each ball, while the foreground is dominated by very luscious and detailed lips.
It's just like one-point perspective, except there are four points of interest and they rotate between the slurping the head, caressing the shaft, and forming a vacuum seal around the balls. Ok, it's nothing like art class. We may or may not have failed Renaissance Art last semester.
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