Hips twitching, Orion almost gave in automatically, his own pleasure of being so snugly encased nearly over-riding everything else. But a surge of vexation at the order was enough to make him stumble, and he drew completely to a halt in irritation.

"...no."

Growling, Orion reached down to press against Megatron's hips, attempting to pin him in place with both hands and a glare.

"I'll move when I wish to."