As the senator whipped around and stalked away, Megatron followed the mech's progress with a narrow stare until Optimus addressed him. Looking back at the Prime, Megatron snorted, shifting his shoulders to relax them from the tension.

"I did nothing," he said with a shake of his helm and a hand both, keeping his voice smooth and flat, even if there was a faint sneer over his faceplates. He'd revealed too much, and way too early, even if Optimus did seem to be as good as his word... At least this early in the game.

"It seems the senators are quite used to getting their way by offering bribes... And haven't learned that you aren't as amenable as your predecessors?" Hopefully, he'd be able to deflect that calculating look and the thanks itself; he wasn't exactly sure why he'd stepped around the crystals.

Besides that implication of using the Prime's body again, most probably against his will. Not that, as the Prime (and a former escort), Optimus didn't have failsafes and security in place, but the threat itself was abhorrent. And Megatron wouldn't put it past some mech to actually have the sort of potential control the senator implied he had... or could have, over the Prime to be able to fulfill his threat.