Megatron's intentions towards him confirmed, Starscream is totally prepared to full on beg and plead for his life (seriously, it'd be physically impossible for him to look any more terrified than he is right now)... and then the music starts.

Not this shit again.

"All that time, serving at your side," Starscream corrects, seamlessly slipping into the same beat with the practice of someone who just did this shit less than a few minutes ago... all as he cringes back from Megatron, posture low and submissive.