He's definitely getting a sinking feeling in his gut, the longer his master speaks. It's so strange, how for months into the aftermath of the war, he bitterly wished that Megatron would go back to his rightful place as leader of the Decepticons and give up his foolish pretenses of peace, but now that it has actually become a reality (at least in the sense), it is unsettling to the core. Megatron hasn't even said or done anything yet, but the general confusion of having the clock turned back is disorienting to the seeker. He tries not to look too reproachful when he is addressed... And then he looks shocked.

WOW, Megatron!

It's noteworthy that Starscream doesn't look anywhere near as outwardly butt-mad as he might have, were he from around the same point in time that these two seem to be. If anything he appears to be annoyed, exhausted and mostly unimpressed. It's always been obvious whenever Megatron has plotted to get under his plating and try to rile him up even before and he has no reason to believe that anything is different this time around, but with the power of hindsight Starscream is far more inclined to be disdainful and unimpressed by this play than anything else.

...No OK who is he kidding he's still feeling pretty significantly betrayed, under all that. Old habits die hard.

"Lord Megatron, if I might interrupt," he says, and continues without waiting for further permission, so anxious is he, "Dreadwing and I had a few conflicts of information that we had hoped you might clear up."