And what a lovely picture it was. Megatron felt his spark flicker and pulse out of tune and his engine briefly rev. But regardless of the very delightful picture he was being presented with, Optimus wasn't regretting anything.

Not yet.

Megatron did cast an appreciative glace at both that oh-so-ready spike and the equally twitching valve, all those tiny little components clenching together and then separating. As he settled properly down again, this time basically laying down along Optimus side, mouth level with the nearest audial and one hand braced around the spike and valve.

"You're not surprised about what, Optimus? Because trust me, while we haven't known each other long, considering what we've done in that time, I feel pretty confident in saying that you will regret that." Murmuring quietly, voice rumbling right into Optimus' audial and lips brushing the metal at every glyph.

The hand he had at Optimus' interfacing housing had his heel just braced against the base of the spike, and a finger, in time with the rhythm of his speech, tracing the rim of the valve.

No closer, no further away. Just slow, lazy movement around the edge while his words and lips created gentle friction right against and in the audial.