Optimus attempted a half-sparked glare, but the expression barely made it through in the face of his sudden pleasure. Attacking his audials wasn't fair at all.

"-Nnn... g-get off those." The last thing he wanted to to loose even more ground than he had the moment he'd been cuffed down. His audials were far too sensitive for this sort of power game - he was bound to lose.

Optimus shifted himself away jerkily, uncoordinated with the sharp sensation coursing through his helm and down his spinal struts, feathering out into his entire frame. They were an obvious weak spot, one he'd only stopped protecting viciously after becoming Prime and being able to relax some from his old bodyguard mindset.

So much for that.