Interesting indeed, Soundwave was an odd bird no matter how you slice it. He shivered again, the apparent purring continuing unabated. At the very least it kept his motor mouth from running.

The deeper feeling seemed to stimulate it more. While the end result definitely wasn't going to be the same as rubbing at a spike, it was still fairly fascinating to see the lights blaze and pulse, and Soundwave's unashamed gasps and moans.