Optimus blinked at the sudden change of pace; he was finally getting used to the pattern they'd set, spilling not a drop between them, only for Megatron to lean back. He rumbled in disappointment and disapproval when Megatron downed the rest of the energon himself. He gave the cuffs on his wrists a baleful tug.

"...I haven't called anyone yet, have I?" He licked the traces of the last mouthful from his lips, trying not to eye the sparklight glow too obviously.

Gladiators shouldn't have something so pretty. He had no idea how Megatron had survived the arenas intact with such a vulnerable display.

"But I would suggest you don't stop what you were doing. I'm still hungry."

And given the tone, it was possible that he didn't just mean energon at this point.