Megatron's optics had gone unfocused as Optimus' euphoria bled over to him through their shared connection, but at the same time a tenseness set about his mouth even as he tilted his helm, leaning in humming against and inside Optimus' mouth when the tongue slipped in.

The nearly mindless pleasure was still something he was resistant against. He couldn't just let himself go, not even here, not even now, especially not when the Matrix was bared, even if he was technically shielding it--

And seeing flashes of it at the bottom edge of his vision made flickers of a lack... of something missing from their already all-consuming, multi-point connection make itself known. But there was only one step left, Megatron vaguely recognized as current flushed his circuits with heady pleasure, and that step he would not take.

Even now.

(Though his Prime may be able to convince him.)

Stroking over what plating he could reach with the hand he wasn't using to balance himself to match Optimus' rythym, Megatron's hand dug into his shoulder, still somehow managing to avoid the base of the cabling there and jerked himself back.

"What..!" Optics narrowing even as he slammed down out of tune with the rythym Optimus had bed, joining the two disparate connections and making a flare slam though his frame, spark pulsing heavily inside its still-closed spark chamber as current flooded the circuitry around it.

"That wasn't what I'd... You're going to forget that."