It didn't take much for Optimus to understand what Cliffjumper meant, and he started to nod in agreement while he still could. However, the second, longer touch earned a low groan, optics dimming in pleasure.

"Nngnn. Well, at least you appreciate the s-sentivity of such things. You'd be surprised how many don't, even when they have similar designs themselves." His audials have been yanked and tugged and mistreated too many times to want to recall properly. He kept up his own motions despite his pleasure, hand at Cliffjumper's jaw moving on to stroke at the vents along the side of his helm, testing the sensitivity.