Optimus hummed against the port, static charge sharp and air around him going heavy with ozone. He flicked his tongue in and out of the connection, his own frame jolting with pleasure and extra current each time; the concentration of it on the delicate parts of his mouth was harsh, but Optimus felt that he could handle it long enough to get what he wanted.

Megatron was close, and he smirked up at the confused mech.

"Still getting...my revenge." He spoke out loud, muffled but adding the vibration to his humming. Optimus himself shivered and twitched with the jolting current. Then he plunged his tongue as deeply as he could manage, lapping at the delicate connection prongs far within.