Author's note: Before I finished "Show Me Myself" this idea popped into my head, and I've been holding back on it for a while, now I'm finally writing it, and boy does it seem like a weight has been lifted off my shoulder. This is intended to be a multi-chapter fic, please review if you want it to end up that way.

Warnings: Pre-movie, SLASH, MegtronXOptimus, and my own theories

Disclaimer: I own nothing, but the theory on why Megs went bung-nuts everything else is owned by their proper copy-right owners. Life just ain't fair, eh?

Secrets

Everyone has secrets. Secrets that they share with a single person, secrets that they keep hidden even from those closest to them. Some secrets are nothing but embarrassing experiences others are promises to keep quiet. Everyone has secrets that they fear to reveal, and some that they tell to let friends know they trust each other. There are even secrets that people keep because they are dangers to those they love, or just those around them. Those secrets are the most carefully guarded and painful ones.

On the planet of Cybertron, back when it was a mighty empire, it had two leaders who had such secrets. Megatron and Optimus Prime were once close, not brothers as they sometimes called each other, but closer. Still, their secrets had to remain secrets, for the sake of the secret that they shared.

"Oh…Ahh…Ahh…Meg-Mega…tron!" Optimus gasped as the older mech's claw-like fingers traced this chassis, searching for the prize.

"Optimus…" he moaned as he drew their bodies together, "Optimus…"

"AH!" Optimus gasped when Megatron's energy swept through him. He clutched Megatron's shoulders, holding him close as his lover continued teasing him.

Megatron grunted and pushed his pelvis down again, Optimus pushed his up to meet him, this time passing his own energy to the other. Their moans increased and Megatron's hand continued to slide across Optimus' chassis. His hand froze suddenly.

"Ahh…" Megatron murmured with a smirk of satisfaction playing across his face, "Here it is…"

Optimus gasped again as Megatron pulled away his armor to reveal the blue spark within. He leaned down, his own armor retracted to expose his spark. Megatron kissed Optimus deeply and caressed his body.

This was their shared secret. Their love was one that they did not want anyone to interfere with.

"M-Megatron…" Optimus moaned in pleasure. "D-do it… now!"

With a lustful growl Megatron thrust his chest onto Optimus. They screamed each other's name, ignoring the blinding light that came with the pleasure. For an instant they were one, able to see into each other's mind. The moaned and sighed when they came apart. They never stayed that way for too long. They had their secrets. Optimus was shy about his, and Megatron…Was willing to kill to keep his safe.

Megatron rolled off of Optimus and the other snuggled into his arms. Megatron pulled him closer and whispered into his audio sensor the words that he really did not need to say. Optimus whispered them back.

He was exhausted; sometimes their interfacing was very rough. Optimus sighed; there was once a time when Megatron treated him as if he would break at any touch. Now Megatron seemed to think that Optimus would break at any touch that wasn't his own. He couldn't really decide if Megatron was protective or possessive, sometimes he wondered if there was any difference between the two.

"Megatron?" he asked.

His lover didn't respond, he'd already fallen into recharge. Optimus chuckled; Megatron murmured something and pressed him closer again. Optimus shut off his optics and began to drift off. He was never happier in any other time than when he was here in Megatron arms, and he thought for sure he never would be.

He didn't know that his secret could have made them happier. But he also didn't know that Megatron's could cause them pain.

Author's end note: Tell me what you think and I'll tell you what their secrets are . By the way, I've finally gotten around to warning my editor about threatening my readers )

Vulture Editor: I know what they are… no I'm not telling, nice try twits but my own safety is on the line here… I took a blood oath not to threaten you guys anymore so I can't push my luck by revealing the Great Secrets.