Optimus jerked again, hip joint crackling with charge and feedback under Megatron's tongue. His laugh was all in the throat, jaw working tightly as he fought another rising cry. The pleasure was sharp enough to make him miss his chance to open his panels, and he almost failed in holding them closed after the moment had passed.

He could wait a little longer. ...Maybe.

"I could," he taunted, hips quivering. "But why should I make it any easier for you?"

Megatron obviously wasn't going to be easy on him.