Host

Idea simply came to me while trying to figure out a way where OP wouldn't be a sub for once :P

This is a collaborative story between myself and Antepathy. This chapter is mine next chapter is Antepathy and so on.

If you like this story then check out our other story 'Cave In' – on the TF Crossover/Beast wars pages.

Ok it's a bit of fun! Especially in the later chapters so get ready for cringe worthy brilliance!!

Reviews are welcome and appreciated.

Prime takes Charge

Having been sent to his berth by an irritated Ratchet to recharge upon complaining of a headache, which wasn't a common occurrence amongst Autobots, Prime lay restlessly unable to shut down his optics. The dull ache had now grown into a throbbing pain behind his optics, he'd heard of robots complaining of headaches but that was rare and he never imagined they could be this bad. His vision blurred as the natural light from the room window burned into his optics. He felt like his head was about to explode. Clutching at his helm with both hands he sat up sharply. The pain became unbearable; he stumbled up and tried to reach the door before collapsing in a heap on the floor with a loud crash that shook the Ark.

He came to, his internal chronometer telling him it was over 12 hours later, he blinked in the darkness. He had been moved to his berth while offline. He sat up and took in the surroundings to the room. He felt different. Stronger, taller and not quite himself. He stood and lost his balance falling heavily back down on his berth. He was taller than he thought and these legs were going to take some getting used to. He half staggered, half crawled to the window of his room. He noticed his reflection in the thick glass. He squinted his optics analysing his features carefully, everything was normal, nothing had been damaged. This pleased him; it would not do to be damaged when there was still so much for him to do. He returned to his berth suddenly feeling a strange desire to stop functioning. He lay down the thought past through his mind as he smirked. 'This is going to be very interesting.' Then his systems automatically shut down into recharge.

It was light when he came online again and he wasn't alone. He glanced up to the door where a stocky black mech stood watching him carefully, concern written all over his battle scarred face. He stretched a little as he stood, much better, much more stable he thought to himself. His cortex analysed all of his internal systems, he could not help but be fascinated by the situation. The other 'bot made his way over to him. "Ratchet sent me to check up on you. You took quite a fall yesterday. You really should recharge more, or I think he's going to forcibly offline you."

"He's angry?" He was surprised at the sound of his own voice it sounded so strange. The other mech stared at him. "You could say that, I've had to confiscate his collection of wrenches, let's put it that way." The other mech was clearly amused. Prime concentrated hard as he tried to remember something important, something that right now would be useful to him.

"Ironhide?" The other mech looked at him in bemusement. "Yes?"

"That's your name?" Now the mech was frowning. "Did you knock your head harder than we thought Optimus?"

'Optimus' his name seemed familiar. The other 'bot was getting suspicious; this didn't concern him right now, as strange thoughts were running through his cortex. Not his thoughts, someone's; 'He looks different, I better tell Ratchet.' "There's no need to concern Ratchet, I'm fine now."

Ironhide stared at him. "I didn't mention anything about Ratchet, Optimus are you sure you're ok?"

Optimus grinned widely, 'Telepathy, a dormant ability. Oh this is too much.' He thought to himself with great amusement, realising he'd just read Ironhide's thoughts. The knowledge he was going to gain from this experience, was going to be phenomenal and he wasn't about to waste a minute of it. His natural instincts took over. He had to distract this Ironhide somehow, with the way he was staring at him and subtly heading towards the door he didn't look like he was going to let him leave. He smirked to himself and took control of the situation.

Being a much larger mech he crossed the room in half the time cutting in front of Ironhide as he tried to exit. Taking a couple of steps back Ironhide had a look of utter confusion and irritation. Optimus managed a smile as his fingers dextrously locked the door to his personal cabin. Ironhide's optics widened as he heard the click of the lock and he took another couple of paces back.

"Optimus what's gotten into you? You're not acting like yourself."

"I'm perfectly functional Ironhide. What's with the sudden rush to leave?"

Ironhide looked distinctly uncomfortable at how the situation was unfolding.

"Um... I really think I should get Ratchet to have a look at you." He lowered his head and made for the exit trying to force his way past Prime. Optimus acted quickly, grabbing Ironhide's arm and swinging him so he landed with his back flush to the ship's wall with a grunt of surprise. Keeping the arm in his grasp he placed his free hand beside Ironhide's helm and leaned in closely, his larger frame pressing up against him. He felt an electrical rush tingle through his circuitry, a sensation he was not familiar with, one word came to his mind. Pleasure. He could hear Ironhide's thoughts racing, the sensation amused him as he felt the smaller 'bots slight panic and despite himself, his growing arousal. He could hear him fighting it, wanting very desperately to leave and get help. 'This is not right.' He kept thinking. Optimus stared at him intently. Before purring softly into his audio receptors. "It's only wrong if you resist and I have to make you." He felt the 'bot shudder beneath him, trying to pull away slightly. Optimus grinned again at the feeble attempts to resist. He pulled away slightly eyeing Ironhide carefully. "Alright then, it looks like I'm going to have to make you."

Ironhide had noticed Prime's optics had turned a much darker shade of blue. His logic circuits were maximising their output in an attempt to rationalise what was happening. He did not get the chance.

Taking the initiative Optimus planted his mouth firmly onto Ironhide's; he squirmed against him as his glossa found the inside of his mouth both curious and increasingly pleasurable. He pressed his glossa against Ironhide's own, Ironhide was resisting with all of his might. He caressed it relishing how it felt against his mouth. Ironhide was struggling much more forcefully now; he released the kiss and not giving Ironhide chance to react he bit down on the wiring of his neck hard making the small mech gasp with pain and groan involuntarily as Optimus used his glossa to lick away the droplets of energon that had formed from the bite. He once again heard his thoughts, a mixture of anger, frustration and something else. Optimus grunted as Ironhide managed to get a knee into his mid section and with sheer brute force shoved him away from him. 'Arousal, that's the something else.' Optimus thought, as he read the other mech's thoughts. Ironhide hesitated only a few seconds, but it was too long, he reached the door just as Optimus grabbed him from behind and using his advantage he threw Ironhide away from the door, sending him skidding across the metal plated floor, his helm impacting the berth with a thud.

Optimus's face was a picture of evil amusement as he watched the dazed mech try to pick himself up from the floor. "Oh I'm going to enjoy this." He growled.

Ironhide felt like he was hit by a tonne of metal as Optimus's full weight slammed into him, half sat, half sprawled he was pinned against the side of Optimus's berth. His helm was slightly dented from the throw and his neck throbbed painfully. Unable to shake the weight from his frame, he on lined his optics and found Optimus staring at him with a strange look in his optics. He felt his hands scratching down his chassis, grabbing every little sensitive part of wiring he could find, front and back. He found himself flexing and writhing in response to his leader's rough touch. He was not gentle, deliberately gripping hard enough to cause simultaneous pain and stimulation. Despite himself Ironhide felt himself overheating, his systems switching to overdrive to cool him down. Something was very wrong about this, he thought as Prime bit him once more, but this time on his torso, he'd pulled apart the plating around his spark chamber just enough and he felt his glossa sliding around the perimeter of his chamber. He tensed and heard himself moan aloud at the sheer intensity of pleasure it caused. He felt his interface module pulse involuntarily, he had to stop this.

Optimus watched as he thrust his glossa into the small gap once more, causing Ironhide to throw his head back and groan even louder. He smirked to himself as he felt Ironhide's thoughts melt away in the rush of intense pleasure that washed over his frame. Optimus moved quickly before he managed to grasp even a slight hold of his senses. With expert knowledge and dexterity he flicked open Ironhide's interface port which was now lit green. 'Good.' Optimus thought to himself. He clutched Ironhide's module firmly making him pull back sharply at the pain. Optimus didn't relinquish his hold and gripped tighter. Ironhide cried out weakly as the pain and pleasure intermingled overwhelming his senses. His hands reached up feebly trying to push Optimus off his frame. His voice came out in a strangled whisper.

"No. Stop this. Not... right."

Optimus sneered feeling completely exhilarated at the power he currently had over his subordinate.

"Only wrong if you resist, remember. Don't fight me, let it happen." He growled somewhat more menacingly than before. Ironhide caught on to the change in tone in his voice, and tried with renewed effort to free himself from Prime's grasp.

"We do this the hard way then." He snarled, gripping Ironhide even tighter, causing him to wince as his armour buckled beneath him. He flicked open his own interface port as he plunged his module into Ironhide. Pulling Ironhide's module to him roughly he thrust sharply. Ironhide cried out his hands tensing to grip Optimus's shoulders, no longer having the strength to push him away.

Optimus felt his module pulse strongly against Ironhide's more rapid pulse; it filled him with waves of ecstasy building along with the rising heat within his circuitry. Ironhide was writhing, almost struggling beneath him as his module pulsed faster. Energon raced around their systems, this was completely exhilarating for Optimus as he groaned despite himself, getting lost in his moment of absolute power and control. He felt Ironhide buckle and jerk beneath him as his systems overloaded, he felt the heat pulsing from his module, then he almost blacked out as he overloaded. It was like nothing he'd ever felt before, how he had gone through life not experiencing ecstasy such as this, he did not know. Through sheer determination he kept his systems online as the warning signs eventually faded from his cortex. He relaxed and looked down. The mech had off lined at his own overload as it completely raged through his system. Optimus grinned at this, returning his module and Ironhide's. He reached down and plucked two wires from the back of his neck. Something his host had seen Ratchet do a couple of times when he'd needed to restrain a patient. Ironhide twitched once and remained offline. Optimus stood and composed himself stretching his metallic frame, feeling the last traces of shivers running through his wiring. He smirked darkly at the unconscious mech.

"Right. Now I've got to see what else this new body of mine can do." He turned and left the room locking it behind him from the outside.

****

Optimus calmly strolled through the large ship. Light fell onto the corridors from view ports. They were on a planet, his planet, exploring, poking, and prodding. Well now it was his turn. He entered the main bridge. The one his host recognised at Ratchet turned to look at him in surprise.

"Optimus! I thought you were supposed to be recharging. I sent Ironhide to check on you and to let you know of our current situation."

Optimus shrugged absently, Ratchet frowned.

"I haven't seen Ironhide. I recharged fully Ratchet thank you for your concern. What is this situation you speak of?"

"Optimus I don't think..."

"Ratchet, I asked you for our status." He snapped mildly irritated and secretly enjoying watching the medic shuffle uneasy at being chastised.

"We detected Starscream on the surface, he's planning something it's too quiet."

"Excellent!"

"Optimus?"

"I will check it out personally." Optimus decided rather cheerfully. Ratchet looked shocked.

"Prime it's too risky, at least take Ironhide and Bumblebee with..."

"I am the leader and I will check it out." He clapped a hand on the medic's shoulder causing him to stumble slightly. "Relax Ratchet." He turned to leave. "Tell Ironhide to join me if you find him."

Ratchet stared after him with a look of complete shock on his face. Jazz strolled in looking rather baffled.

"I just passed Prime, he seems... cheerful."

"Something's wrong, go find Ironhide, he was supposed to keep a fragging eye on him!" Ratchet monitored Prime's progress via Teletraan 1 as Jazz took off swiftly without a word. He knew better than to argue with him when he was in this mood.

Jazz reached Prime's quarters and using his security clearance over rode the lock on the door. His optics were greeted with the sight of Ironhide slumped against Optimus's berth, he looked a little worse for wear and Jazz could not get him online.

"Jazz to Ratchet. Got a situation Prime's quarters. Ironhide is off line I can't wake him he looks injured. Best get down here."

"Understood." Ratchet growled impatiently. He glanced at Bumblebee who merely shrugged. "Keep monitoring Prime. Don't let him out of your sight tell me as soon as anything changes." Bumblebee nodded and Ratchet ran towards the living quarters of the ship.

He stopped sharply at the sight of Ironhide. Crouching beside him he scanned his systems. The plating above his optic rose sharply. Jazz looked at him. "What is it? Is he alright?"

Ratchet managed to suppress a wry grin; he knew exactly what had happened to Ironhide from the readings in his scans. He gently reattached the wiring at the back of his neck. "He'll be fine, bit embarrassed but fine."

Ironhide looked at them incredulously. "Get the frag off me." He growled impatiently.

"What happened 'Hide? You look pretty banged up." Jazz asked quietly. Ironhide scowled at him. "None of your business. Where has that slagging mech got to?" Jazz stared at Ratchet completely nonplussed; Ratchet caught his questioning gaze and ducked his head attempting to hide his inappropriate amusement at the situation. Realisation crept up Jazz's face as he slowly turned back to Ironhide.

"Ooohh..."

Ironhide's frown deepened even further. "Shut it. Both of you and tell me where the frag Prime is?"

Ratchet was scanning the room and had focused his attentions on Prime's berth. He reached down, his fingers smeared into a patch of something on the metal frame.

"What the slag is that?"

"Ectoplasm. Just like on those creatures Bumblebee picked up from the surface of this planet to analyse." He turned to the other 'bots, "they're parasitic."

"What?" Ironhide growled his patience fading rapidly.

"It's safe to assume based on Prime's odd behaviour and his headache that he's been taken as a host for one of those creatures that Bumblebee picked up. They must have latched onto his frame when we were on the surface."

"Those worm things?" Jazz asked clearly disgusted by the whole idea. Ratchet nodded his gaze fell to Ironhide who looked completely deflated.

"You mean he's being controlled?"

"I'm afraid so. Probably not consciously aware of it either. They're a part metallic, part organic species, makes sense they can take robots as hosts."

"What do we do?" Jazz was concerned now.

Ratchet sighed. "We get him back before it um... makes him do anything he'll regret when he regains control of his body. Well… anything else that is." They both cast quick glances at Ironhide before making a quick exit. Ironhide followed his irritation simmering just beneath the surface.

'Bumblebee to Ratchet. Prime has engaged Starscream. He's out numbered!' Bumblebee's electronic voice was frantic. They broke into a run. "We're on our way Bumblebee; guard the ship until we return and for Primus's sake find a way to kill your new pets!"

****

Prime was indeed outnumbered, he'd run into Starscream, Blackout and Barricade. They had been taken by surprise as they had been working to collect this strange planet's energy resources, the same reason the Autobots were there. They were on his planet stealing his resources, taking his people prisoner, experimenting on them. Although the resulting host had proven beneficial he could feel its consciousness trying to regain control. Trying desperately to force him out, he wasn't ready to give up this body without a fight. He still had so much to learn; now he was playing with his body's strength.

Blackout lay sprawled off line near to the edge of a cliff. Prime had given him a thoroughly good beating; his rotors were twisted and almost torn from his back. His armour was dented where Prime had punched him and his head looked like scrap metal. Now Prime was facing Barricade and Starscream. Starscream had the advantage of height and kept firing at Prime from above. Prime was impressed by how fast his body could move when it had to and at the surprisingly small amount of strength it took to throw the smaller mech in front of him.

Barricade landed with a crunch as some of his armour plating cracked. He swung round in time to see Prime aim his weapon at Starscream, striking him squarely in the centre of one of his wings, putting a hole straight through it. Starscream screamed in pain and rage as he plummeted to the ground. He angled himself so he was sure to land on the unusually aggressive Autobot leader. He slammed into him, his feet cracking satisfyingly on his breast plates sending him flying into the rocks. He pounced on him and punched him viciously in the head. To his astonishment, Prime laughed mockingly at the punch, Starscream was taken aback.

"Oh you like that do you, here have another!"

Prime glared at him his optics dangerously dark, he grinned menacingly.

"More than you know you vile robot."

"Vile Robot?!" Starscream screeched in anger. "What does that make you Prime?"

"One who's going to return the favour." He snarled, before Starscream could stop him his fingers dug into the plating protecting his interface port, tearing at it. His optics widening in horror, he frantically tried to beat the crazed Autobot off him, losing his footing he slipped back wards. Prime used the opportunity to reinforce his evil grip on Starscream's interface module. The seeker stopped struggling as soon as the first agonising waves of pain hit his sensors. Whimpering he tried not to let his module become insensitive to the pain and instead aroused by the firm grip. His air vents inhaled rapidly as Prime leaned closer, his face unreadable. This was not the Optimus Prime Starscream knew, he was different carnal, amoral. Prime muttered in a low growl as he eyed Starscream's form menacingly.

"I wonder if that which can induce pleasure can also induce an equal amount of pain…" He mused, Starscream processed what he was saying, and then felt agony shoot through his interface port as Prime wrenched his module sharply, observing it almost like an experiment.

"Barricade… Do something!" He shrieked in panic as Prime drew one of his swords. "Oh no…"

"Oh yes." Prime sneered, raising his arm for the blow. Starscream couldn't help but shutter his optics in anticipation. He heard a whir of a weapon and a click; opening his eyes he spied Barricade pointing his weapon directly at Prime's head.

"Put the jet down." He spoke slowly, he was tense.

"Just shoot him!" Starscream cried out. "Then they'll shoot us." Barricade gestured to the Autobots who had their weapons trained on them.

Ratchet came forward. "Optimus, you've got a parasite inside you. You have to fight it."

Optimus snarled viciously, the Autobots were at a loss what to do. Without hesitation Prime plunged his sword into Starscream's shoulder and using him as leverage planted his foot firmly on his throat as he stood and grabbed a shocked Barricade by the throat. Barricade clawed at his hand as he was lifted four foot from the ground. With little effort Prime launched him into Ratchet and the two went flying.

Ratchet scrambled out of the way of Prime's weapon as he fired wildly, his eyes almost black. Ratchet glared at Barricade. "When I give you the signal, get out of here. We have more important things to worry about right now."

Barricade glanced at him. "Don't need to tell me twice." He muttered. Ratchet stood again ducking beneath another volley of shots from Prime's weapon. He now had hold of the injured Starscream round the throat, using him bodily as a shield. He was backing away from the Autobots. Prime could sense he was losing this battle, the pain in his head was becoming too much the host was too strong. Only one course of action left. He aimed his weapon at the medic coming towards him and blew out his leg. Ratchet collapsed in a cry of pain. Grabbing Starscream's helm he turned him to face him. Starscream's face a mixture of horror and shock; he tried to claw at Prime's face. Gripping him tightly he forcibly planted his mouth on the seeker's. Starscream groaned with surprise and revulsion as he felt something slide down his throat. He gagged violently.

The onlookers stood agape at the scene before them. Ratchet's jaw dropped as he watched his leader forcibly kiss his enemy in a fierce embrace.

'Ratchet, anyone! This is Bumblebee you need to give it an electrical charge to the head. That will at least render the creature unconscious.' Bumblebee's digital voice sounded over the comm. Bringing the Autobots out from their shock, Ratchet nodded to Ironhide who rushed forward gripping Prime's head he fired a localised EMP charge direct into his cortex. It took out both Optimus and Starscream; they collapsed on the floor in a heap. Barricade needed no signal; he grabbed the injured jet and practically dragged him away from the surreal scene. Reaching Blackout's still form and calling for reinforcements.

Ratchet stood painfully. "Let's get him back to base." Ironhide and Jazz lifted their unconscious leader between them. Ironhide sporting a rather smug expression. Jazz frowned at him. "You enjoyed doing that didn't you?" Ironhide's slight grin grew. "He had it coming."

****

Optimus came to in the med-bay. Clutching his head he found himself restrained to the bed.

"What the?"

"Oh you're awake. Good. What do you remember?"

"Remember? About what? I had a headache and I think I collapsed, what are you talking about Ratchet?"

"I think you're going to want to check your internal memory files. I'm going to leave you restrained for a while."

Optimus stared at him completely baffled. "I don't need restraining, I'm fine."

"Hmmm, I don't want you injuring yourself."

"Why would I injure myself?"

Ratchet smirked slightly. "Check your files, you'll see." He left Optimus alone for the moment. Sighing Optimus internally ran his internal memory files of the last 24 hours. Ratchet smiled to himself as he heard Optimus's air vents inhale sharply before a low groan came sounded from his patient.

"Oh Primus!"

****

Back on the Nemesis, Starscream was recovering in the repair bay. He opened his optics. He felt different, strange. This wasn't like before. His face erupted into a wide grin as he flexed his limbs. Barricade walked through the door and glanced at him sharply.

"You recovered then." He stated blandly. Starscream widened his grin further as Barricade scowled at him.

"Oh yes, I am perfectly functional." He answered slyly. He eyed Barricade curiously and calculated the distance between himself and the repair bay door; he knew he would be faster than the mech standing in front of him. He emitted a low growl causing Barricade to glance at him as he got minor damage repaired.

'Oh this is going to be fun.' Starscream thought as he strolled across the repair bay and locked the door.