He tried, he really did, but the twitch of those cables along with the lingering bite, as well as Optimus' displayed dominance now that... that had been dragged up from where it was usually kept, brought a faint whine to slip out his vocaliser.

In frustration, Megatron tried to straighten up, back off and yank his throat out of the hold, because, no matter if this was certainly part of a proper Prime's... preorgative and some part he'd come to associate with the Key strengthened that, he was not---

And then that charge rushed through like a gentle burning wave, and the collar around his neck joined its gentle persuasion to his Prime's obvious anticipation and vague desire at him doing as told---

Megatron's engine revved.

He wasn't submissive, not really. To be Lord High Protector of Cybertron, to protect his Prime, he couldn't be. But at the same time, he'd had to recognise when orders were to be followed.

"Later. If it would still please you." Megatron's voice was a low thrum nearly silky in its pitch and depth as he stopped fighting. Some part still didn't like it, but another had put together the pieces and if he had to have this annoying little proclivity, he'd rather it be tied to this mech.

Despite the issues they'd had so far, the rest...

Well.

If he could just prove he was worthy of what Megatron's suddenly relaxed frame would imply he was given, that was.