That Optimus responded so readily even to bites which, really, weren't particularly gentle was certainly interesting. Some part of him was pleased as well, but he reined it in, letting the lazy waves of pleasure haze and disguise that particular feeling.

He didn't need that showing up right now, but that didn't stop him from giving in for just a brief moment, closing his teeth about a line and tugging. Relaxing his jaw immediately after that, Megatron simply kissed the abused area and pretended to ignore the flashes of annoyance.

The shame was a bit more alarming, but he guessed it was all tied up into each other and while he probably wouldn't be able to fix that with simply once, he'd start on it when he had Optimus beneath him and unable to protest.

Of course... the tentacle-like cabling might be an issue.

"Hmmm, yes." He muttered against Optimus throat mostly for the vibrations it created against the metal, withdrawing his finger even as the caliphers fought to keep it in, but unlike a spike, fingers were smooth and lacking all the tiny little mechanisms that would hook together with the same in the valve.

Smirking against Optimus' throat, Megatron jammed his finger back in completely, this time with the surface charged with current, and clamped down with all his own caliphers, valve and ports at the same time.