A/N: I bring you more Creepy!Knock Out, and I think this is the creepiest that I've made him so far. I think I even freaked myself out a little.

I also added a little bit of Onesided Jack/Optimus because I could totally see it.

This was inspired by Slipknot's "The Virus of Life" and "Prosthetics."

The first time he felt his chest burn, he thought it was just something he ate, and his mother gave him a pill for it. He also thought it was just some kind of jet lag because of the whole thing with Optimus' memories and him going to Cybertron with Arcee to fix it. The second time his chest burned, he didn't think much of it and just took another pill; the burning going away. Though from the corner of his eye, he thought he saw something as he was walking out of his workplace.

He just brushed it off.

The third time it happened, the burn hurt. He asked his mother to have one of the doctors take a look at him, but his heart rate was normal and the blood they took came back with nothing wrong. It worried both him and June because they didn't know if it would continue. The doctor just advised them to come back if the pain came back.

With nothing else to go on, they did as instructed.

June had kept a close eye on Jack whenever he was in her sight and would call him when he wasn't to make sure he was alright. She's asked him when they were seeing the 'Bots and he'd embarrassedly told her he was alright, though when Optimus himself had asked him if something was wrong, he'd flushed and explained about the chest burn. Arcee had been worried and disapproving when she found out he'd kept it from her.

Though not wanting her to get worried was the reason he hadn't wanted to tell her. But he kept the fact he might be seeing things to himself; it didn't help he kept seeing the same gleams of red from the corner of his eye every time he left his work. And every time he tried to see what it was, Arcee would come to pick him up and he didn't want to draw attention to it.

He should have known it wasn't just his imagination.

The red 'Con came out of nowhere and shock had him still for a moment before he ran; he couldn't hear the car behind him, but the 'Con drove ahead of him and sharply turned, the door opening and before Jack could make a turn of his own, he went straight into the cabin. He groaned and tumbled over himself as he tried to get out of the car, but he was forced to pull his legs up or else the closing door would have caught his legs and figured Knock Out wouldn't care if he got hurt.

Jack lifted himself up and tried to get the door to open. "Let me out!" he shouted and could hear his blood rushing through his ears and his chest felt constricted.

"Be quiet, skin job." Knock Out hissed and used the seat belt to strap Jack to the seat. The boy stilled as a blue light ran over him and Knock Out let out a nonchalant hum. "Huh, I was right." He said haughtily to himself.

Jack furrowed his brow, confusion overriding the fear he was feeling. "What?"

"I said be quiet." Knock Out hissed and used a small electrical shock to make Jack go unconscious. "That should keep you out for a while." He muttered to himself and opened his comm. link. "Open up a ground bridge."

Jack groaned as he woke up, grimacing at the unpleasant shock he'd felt and his eyes shot open as he realized that the 'Con had caught him. He tried to move, but he was strapped down onto a large slab and smaller restraints were keeping him where he was. He wriggled around, but couldn't do anything other than struggled uselessly.

The boy looked around as much as he was able to see where he was, though the gloomy darkly lit space filled with other slabs and the counter with tools stationed in the corner left an ominous feel in the room. Jack gulped as he eyed the sharp objects and wondered if they were going to be used on him.

The doors to the room slid open and Jack glared at the smirking red medic that came in, but then it changed to fear when Megatron himself walked in next. The mech glared maliciously at Jack, his optics narrowed in disdain and then shifted his glare to Knock Out.

"You have brought this pest onto the Nemesis, why should I not terminate him where he lays?" Megatron growled.

Knock Out's smirk fell as he straightened up, his expression turning momentarily serious as he pulled out a small device and let the blue light that came out slid over Jack before holding it out to Megatron. "There was a spark signature picked up not long ago, and I went out to see for myself; it was coming from this human, and as I kept track of him the signal grew stronger. I brought this human because he has a spark."

Jack rapidly paled as he heard this and that the red gleams had been Knock Out spying on him. He thought about how this could have happened before thinking back to the trip to Cybertron. Was that how this happened? But how? Jack saw that despite himself, Megatron looked grudgingly intrigued.

"And what exactly would it do to this human?" he questioned.

"As the spark grows stronger, his human body would no doubt be unable to sustain it, and it would look for other means of staying active; his body would change to that of a Cybertronian gradually." Knock Out explained bluntly. "Though I can assure you, this process would be quite…painful."

Jack grimaced and he could have sworn that despite the poor lighting that he saw Megatron almost smirk. "Make sure this human's stay is comfortable while he changes." The mech said and Jack wasn't feeling very comforted by the smirk that returned to Knock Out's faceplate. "Inform me when it has completed."

The clang of the door following Megatron's departure left the room in a foreboding silence.

Jack squirmed in the restraints as Knock Out swaggered over, that smug smirk seemingly a fixed upon expression upon his faceplate. "Why?" he questioned as from what else he got from the conversation was that Knock Out had gone behind Megatron's back to get him. "You didn't know he wouldn't have killed me."

Knock Out grinned down at him. "Oh, but I did. For ever how much he hates you, I knew he wouldn't miss the opportunity to torment you himself when you are the proper size for it." He explained. "As for the why I took you…why not? I saw your signature, wanted you, and took you; it's really as simple as that."

"Is there a chance you'd let me go after this?" Jack asked nervously.

"No." Knock Out said flatly. "Though that doesn't mean we still can't have some fun before you change."

Jack furrowed his brow, his face paling once more. "W-what did you just say?"

The 'Con didn't answer as his servo shifted into a saw and he leaned it down closer to Jack. The boy struggled screamed as he tried uselessly to get away, his chest constricting with fear as he closed his eyes and he waited for the horrible feeling of the saw ripping into his skin. He heard the sounds of the mech chuckling before the buzzing quit abruptly and Jack opened his eyes and squinted as that damn blue light was shined on him again.

Knock Out looked pleased with himself. "Well, it seems fear causes your spark to react more quickly, and that makes the process speed up in turn." He looked momentarily contemplative. "It seems I won't have much time to torment you while you're still human," he paused once more, "though there's still first dibs after you've finished changing."

Jack shuddered at the things Knock Out was implying. "The Autobots will come for me."

Knock Out tilted his helm. "Really now; and why would they do that? They couldn't even get their Prime back when he was on this ship."

"You're wrong." Jack spat.

"Am I?" Knock Out questioned and without warning, he reached down and scratched along Jack shoulder, causing the boy to cry out as his shirt was stained with blood. "I'm going to scratch you every day to prove your little theory wrong, and when you're cover with scratches you'll see that they don't care."

Jack gritted his teeth and through the pain he glared defiantly at the medic. "You're wrong." He repeated stubbornly.

"You're stubborn," Knock Out said and chuckled darkly, "I'm going to enjoy tearing that down."

Jack's glare heated. "Do your worst."

Knock Out returned the glare with a dark grin. "Well I can't do my absolute worst without killing you, and where would the fun be if you ended up dead? No, I'm going to break you until you won't be able to recognize yourself." He continued and dug the tip of his claw into Jack's chest to emphasize his point and the boy cried out at the painful sensation. "And when there's nothing left of you," his optics bore chillingly down into Jack's eyes, "then I'll make you perfect."

When Jack awoke, all he could feel was the increasing pain in his chest and the aches from the cuts on his body. He couldn't keep track of how long it had been, but even with what Knock Out said about giving him the scratches each day, he didn't believe him. He wouldn't put it past the 'Con to just do it anyway to try and trick him.

He wasn't given any kind of food or water, Knock Out only taunting him about how they had to hurry up the transformation if he wanted to survive. He had been stripped of his clothes because the medic informed him that he wouldn't have any use for them, and Knock Out had taken the time to mock him and degrade his human body's reproduction system. It terrified Jack when he saw the promise in the 'Con's optics when he told him that he'd show him how it was really done.

When his fear spiked his spark up in response, the mech had looked pleased with this and Jack wanted to desperately believe these horrifying hints about what Knock Out wanted to do to him were just digs at him.

Jack cringed as the pain intensified and he looked down at his chest, grimacing as he saw through the chest wounds the faint glow of a spark. He gasped as he felt a pulse go through him and heard the metal restraints creak. He was wary of what was going on but didn't have time to think about it as a more painful pulse went through him and heard the restraints creak further.

The doors to the room slid open and Knock Out walked in, his optics going straight to Jack and he paused only for a moment and shined that blue light over him. He looked down at the results and grinned as he more cautiously made his way over to Jack. "It's almost done." He said quietly and dragged one sharp claw over Jack's thigh and the boy froze. "You're almost ready now."

"Get. Your. Hand. Off. Me." Jack gritted out, but this only caused the mech to chuckle like he'd heard something particularly amusing.

"You can't hide it; you think I don't see just how frightened you are?" Knock Out questioned and drew his claw further up Jack's thigh. "Of this?" he brushed past the groin area. "Of me?" he added and dug his claw deeper into the chest wound to let the spark glow brighter through the blood.

Jack cried out and tightly shut his eyes as waited for the wave of pain to pass, the sound of the metal underneath him bending. He peeked out and saw a disturbing look of fascination on Knock Out's faceplate as his optics stayed fixated on the glow of Jack's spark.

"Do you have any idea how easy it would be to tear that lovely spark out of you? Too easy, it's the reason I didn't kill you when I had the chance." Knock Out said and never looked away from the blood and glow. "It would have been all too easy to rip your fragile body to pieces, but where would the fun be in that? This change gave me the means to bring you here."

"You're crazy." Jack wheezed out. "You're sick and crazy."

"As if you are any saner than I am," Knock Out retorted, "as if you haven't done something crazy for someone you wanted."

Jack thought of how he went to Cybertron to help get Optimus' memories back and bit down on his lip; because damn it all he did understand that. He had never done something that the Prime would disapprove of because he wanted to impress the mech, even if the attention he'd ever get was that of an acknowledging glance.

He knew what Knock Out meant, and he hated it.

The medic saw the hesitation on the boy's face and smirked as he loomed over him, the tip of his claw under Jack's chin and he tilted it up to make him look at him. "You have, haven't you? And has it gotten you what you wanted?" he questioned and Jack remained silent. Knock Out wasn't deterred though as he kept on speaking, "When I break you down, I'll make sure to erase every touch you wanted from them with my own, until you can't get enough of me. And when you think back, all you'll know is me."

Jack's breathing increased as he finally comprehended the fact Knock Out was not trying to make his transformation speed up; he really seemed to mean what he was saying. "You're sick." He repeated.

Knock Out's optics narrowed into slits and he very deliberately dug even deeper into Jack's chest until the glow of the spark shined out. Jack screamed as waves of pain flooded through him and he heard the metal creaking and bending more as the pain grew more and more painful and constricted.

Knock Out backed away as he watched with sadistic captivation as that little push over the edge had finally triggered the full transformation.

Jack felt like dying as his body felt like it was being ripped apart, and for all he knew it very well could have been. He wanted to fall unconscious, but even as the pain became too great he couldn't escape it. Screaming gave him little release as he could barely tell whether it was him or the metal screeching around him to the point the sounds all blurred together into one incomprehensible mess where the only thing he was sure of was how much he wanted to die.

Only when the pain abruptly stopped was Jack given sudden clarity once more. He could feel how much his throat hurt from screaming, he didn't feel the scratches on his body or the deep chest wound, and when he opened his eyes, everything seemed closer.

When Knock Out was in his line of sight, the mech's intense stare had him pinned before he knelt down and held Jack's shoulders down; Jack being very much aware now that he was in his Cybertronian body. The medic's optics looked over his face and over his frame, and Jack peered down at his new body, all black and silver. The mech's words made him snap his attention back to the medic, whose faceplate was too close to his own.

"You're finally ready now."

Terror finally set in as Jack was felt the claw digging painfully into his shoulders as he was pinned down and the kiss caused him to thrash his arms out at the medic. "Get away from me!" he yelled out hoarsely and the stinging in his throat made him wince.

Knock Out grabbed his flailing arms and pinned them down with one hand as his other shifted into a saw again and he held it threatening close to Jack's face. "Be still, or I'd hate to have to ruin that pretty face so soon." Jack stilled at the dead serious way Knock Out was looking at him. "If you move, I will make you regret it." He hissed.

"You are already are." Jack snapped without thinking.

Knock Out scowled and slammed Jack's head against the floor, momentarily disorienting him as he heard Knock Out keep on talking. "It's going to hurt, Jack. And whether you want it or not, and it's going to happen." He said tersely. "It's time to deliver on my promise, Jack. I'm going to tear you down, and then I'm going to make you perfect."