Optimus certainly did try to kick and thrash, mute growling only audible from his chest and engine.

The worst part of all of this was his sudden helplessness. The complete communications blackout. He could have called for help before, if it had become too much. Now though...

Now there was a real tingle of fear, hidden deep under the anger. Megatron had, of course, had his chance to kill him several times over, already. But the helplessness exacerbated it nonetheless.

Humiliation spiked up as his weakened legs were hoisted up; had he the strength, he probably would have attempted to dent the mech's head between his thighs. Instead, he refocused himself on keeping his panel closed, determined to not humiliate himself further by exposing his interface to whatever games Megatron wanted to play.