Chapter Text
Optimus told himself that everything was under control.
Everything was going to be fine.
But ever since Megatron came back and the Elite Guard had set pedes on earth…
It was hard to admit that he enjoyed living on Earth, far away from the turmoil on Cybertron and being shunned by his own people. His newfound responsibility towards the humans and his team by his side was one of the few things that were keeping him sane.
Yet Primus had a twisted way of showing that no matter what he did, his own past would come to bite him in the aft.
The Prime had been on edge, not only from the turmoil of being threatened with a court martial but also from the disappointment of seeing the Magnus become so negligent in his decisions.
Had it not been for his insistence, Megatron would have had the upper hand with the Allspark search or worse.
Sentinel, on the other hand… was complicated.
While Blackarachnia had made her goal pretty clear, his old trinemate instead, had been… Erratic to say the least. Either he was berating him like usual, or he was “remembering the old days”. The latter meaning soreness and silent treatment for the next cycles.
It was exhausting.
Optimus was angry.
At himself…
At the Elite Guard…
At the Decepticon tyrant…
He needed to hold it together for his team’s sake; he had to show stability. Otherwise, things would become unstable, and that was something they didn’t have the comfort to show.
But each cycle it was becoming more unbearable.
Nothing sounded better than running away, dipping his helm into the ocean and screaming his sorrows into the void.
And that fateful day…
He reached the point of no return…
It was the routine conflict; it was supposed to be easy. Stopping the theft of materials was almost routine. The two decepticons would try to take as much as they could; his team would stop them with various degrees of success and would call it a day.
Not that time…
The regular spots raided were safe and empty most times.
Not the case…
Lugnut and Blitzwing had chosen to pillage a facility in the middle of rush hour Detroit, putting countless lives at stake; his team had no choice but to avoid any harm to the humans. While Bumblebee, Prowl and Bulkhead made their best to distract the two offending Decepticons, he and Ratchet made efforts to evacuate the area as fast as they could.
It was already enough that the humans were struggling with trusting them; an attack like this would only plummet their progress.
Just when things began to look a bit brighter, the floor trembled as a massive figure overshadowed him.
Optimus didn’t need to turn around to know who it was.
It didn’t take Megatron much either to plunge his sword towards the Prime, with barely enough time to block it, the axe pushing back against the impact.
“I’m getting tired of your impertinence, Prime!” the warlord growled.
The civilian frame stared daggers at the Decepticon leader.
“We’re tired of your constant carnage ourselves!” the Prime spat back. “We’ll keep this up as many times as we can!”
Megatron swung once more, almost throwing Optimus out of balance. On the corner of his optics, he could see the medic approaching.
“Ratchet go!” he ordered.
He couldn’t make out his answer, but he did not stop at his command. The Prime yelled again.
“Keep the humans safe; I’ll get Megatron out of the city!”
Ratchet looked like he wanted to protest, but any of it quickly died on his throat as he turned to lead the remaining humans out of the crumbling area.
Another hit from the tyrant almost grazed him.
“You’re confident in your own success, aren’t you?” the warframe mocked. “I’m sorry to be the bearer of bad news, but your pathetic resistance ends here-!”
He was cut by the Prime slamming onto him, bracing himself against the warlord and causing the two to fall from the highway they were standing on.
The Prime could feel the tiniest bit of relief, seeing himself and the Decepticon leader distancing themselves from the public.
Megatron had no time to transform, roaring in pain as he crashed right through a dilapidated building, Prime following as he still grabbed onto the warframe. Both tumbling down the cement floor.
Optimus’ audials were ringing at the impact, through the dust he almost didn’t dodge the blast the tyrant had sent his way, causing the structure to crumble even more. With no room to recover he tried to swing his axe back at the enemy, attempting to make use of his battered state, though Megatron kicked it out of his hands, raging red optics fixated on him.
The Prime’s mind was on autopilot, all the pent up stress seeping out as he lunged at the warframe, screaming as he punched and kicked against the other with all his might, even if is strength had been compromised due to the fall damage.
Megatron barely moved, just blocked the smaller frame’s hits as he also recovered, he had to admit it was no small feat, the Prime could stand his ground against him at an astonishing level. That stunt alone left him more impressed than irritated.
But he eventually ran out of patience.
With a single hand he toppled Optimus, pinning his waist to the ground.
“En-!”
A kick to his faceplates interrupted his speech and forced him back, he hissed as he immobilised the still thrashing autobot.
“That’s enough!” The warlord barked at the Prime, inches away from his face.
“Frag you!” he yelled at the Decepticon.
Megatron bellowed angrily as he lifted the autobot by the chassis, slamming him violently against the floor.
Optimus barely paid attention, he was overcharged from the fit, his processor was barely coherent anymore.
But no one knew who moved first.
Their dermas met in a clash of charge.
A moment of surprise for both, promptly ignored as they pressed their intakes further.
The warframe’s glossa battled with the Prime’s, gaining dominance as the autobot let him in further. It hurt in that perfect way, pleasure and pain mixed when all rationale was thrown out the window.
A clawed digit left his waist to slide down towards the civilian frame’s closed panel, causing a ripple to run all across his body. That made Optimus snap back to reality, trying to push the tyrant’s helm away.
Megatron did not let go without leaving his mark, biting down on the Prime’s lip as they separated, dust from the rubble and lubricants mixed with energon adorning their faceplates.
The autobot was in shock, optics wide as he stared at the warlord, who was licking his derma, taking his time to savour the energon spilled from the bite.
“Who knew such dirty thoughts hid behind your processor?” said the tyrant, grinning like a predator. “I wonder, what else are you keeping from me…?”
Optimus managed to get a weak hold of himself.
“I didn’t- ! It was sudden!”
“Yet you didn’t refuse.”
The Prime gulped in embarrassment, it really couldn’t get any worse from that point, why bother then…
His servos gripped the bigger frame’s helm, tangling both in a desperate kiss once more.
There it was…
His most shameful thought, buried amongst his anguish.
The warlord was outstandingly attractive, that he could not deny, but to Optimus it was starting to become something more worrisome.
From the moment Megatron had grabbed him on the ship, something had lit in him, he hadn’t felt fear or impending doom, just a burning charge pulsing through his body.
Every time they clashed, fought or screamed at each other, the same embarrassing bolt of charge surged all around him. Now in his rebuilt body, the sensation intensified tenfold, though often beaten by his duty, yet it in this very moment, away from the chaos for once, he could not hide it.
The warframe pinned the bot to the ground, same claw now tracing the seams of his panel, urging Optimus to open it. The metal felt increasingly warm to the touch, it was intoxicating, he could barely keep it together to leave it closed, he wanted the warlord to touch him so badly.
Megatron left the civilian’s intake, licking a long line down his neck, the Prime tensed as he came too close to vital energon lines. The tyrant’s dentae brushed against them, almost to mock how defenceless the younger mech was.
When Optimus felt the pressure build as he bit him, he let out a barely stifled moan. The warframe stopped, coming up to face the him.
“What games are you playing Prime!?” he asked, tone accusatory. “What is your goal with this stunt?”
The autobot could not give him an answer that would make any sense, he was overcharged and could feel lubricant already pooling under his plates.
“I don’t know… I just- Please, I need this.” he blurted out, clarity blurring by the minute.
Megatron tightened his grip on the Prime’s chassis, causing his modesty panel to snap open. Lubricant dripped out as his valve was exposed to the air, the sensation causing the mech to shiver in stimulation.
A dangerous grin spread across the warlord’s faceplate; Optimus could swear he heard a distant metallic noise in the background.
“Need what?” Said the tyrant leaning into his audial.
The autobot gulped, turning around, the warframe followed, his breath hot against the metal.
“Tell me, little Prime~”
“Frag me…“ said Prime mumbled, numb from shame.
Megatron’s finger ghosted above his anterior node, so close but not yet touching.
“The impact has left my audials a bit dull, you’ll have to be louder.”
The digit caressed the outer lips of the damp valve, Optimus’ face couldn’t get any degree hotter at that moment.
“Frag me please…”
“Louder.”
“Megatron-“
“Louder!”
The Prime swung his fist towards the warframe’s face, making the bigger mech momentarily draw back at the impact, amazed at the strength such a small mech could have.
“Glitchead!” The smaller protested. “Are you fragging me or not!!??”
Megatron laughed at the autobot’s frustration, plunging down to devour his intake again. All the smaller one’s protests stopped once he felt the stretch of a massive finger entering his valve, the size enough to feel like a regular spike.
He was burning up, his valve clenching around the intrusion, demanding more, all his moans absorbed by the older mech. Another digit soon followed, both reaching his ceiling node, making the Prime contort in pleasure, grabbing firmly onto the warlord’s shoulders.
Fingers thrusted and scissored, stretching the autobot beyond what he ever had been. A third one entered, and Optimus screamed into the tyrant's mouth, tensing as he felt the vibration of his laughter.
“It’s too much…” he stammered, trying to accommodate the intrusion.
“You’ll need at least three of my fingers inside you if you want to make it work, little Prime.”
The civilian’s optics widened.
“What do you mean at least-?”
He was cut off by the warframe grabbing his servo, dragging it down towards his array. The metal was almost burning, the panel was bent from the pressure behind it, The Autobot could only stare in shock.
With a hiss, it snapped open, freeing Megatron’s spike. The warlord’s servo guided his palm alongside its length, dark grey just like his body, crimson biolights glowing on the sides in perfect sequence, black energon lines pulsating underneath, a small layer of fine mesh made the texture almost soft in some areas. At the tip, pre-transfluid already began leaking.
It was… Huge…
More than he thought he could handle…
“That won't fit…” said the Prime.
The tyrant pinned his hand back onto the floor.
“You civilians have grown accustomed to the lack of warframes. Rest assured, it will fit.” He said thrusting his fingers right into the Prime’s ceiling node, making him whine. “But first.”
He directed his attention to his neglected anterior node, pressing his thumb on it as he worked his digits with astounding precision. It took no time for the Prime to stiffen, screaming his voicebox raw as he overloaded.
“Look at you, coming just from my servo.”
What came out of the Prime could only be read as a broken whimper. The warlord enjoyed the show as he withdrew his fingers, tasting the civilian’s own fluids like a delicacy. Optimus watched with blurry optics as his valve demanded more.
“Just how long have you been thinking about this...? Having your people’s most feared enemy causing such reactions!?” The tyrant laughed, grabbing the Prime’s legs and spreading them as wide as they allowed. “What would your subordinates say of your behavior?”
“Leave them- Out of this!” The civilian yelled in broken gasps. “This is between you and me…”
“Oh, of course it is.” The warlord teased while something hot and blunt was prying at his entrance. “Just imagine the thought of them watching as I frag you with my digits~”
Optimus should have felt deep shame at that mention, but the lingering sensation of his outer nodes being touched by the tyrant only brought more desire.
Megatron was dragging his massive spike alongside the blue valve lips, soaked from all the activity, coating the whole length in his light blue lubricant as he aligned himself to the stretched out entrance.
“Even more…” he whispered while staring deeply at the prime below, slowly sinking into the tight, scalding hot valve. “Think of what Ultra Magnus would say if he saw one of his Primes being claimed by his nemesis right in front of his face~”
With that said, he thrust himself into the deepest points of the civilian, who in return arched his back, trembling as he screamed in overstimulation. The stretch, the pain, the pleasure and the embarrassing thought of his superior witnessing his disgraceful state had saturated Optimus’ mind, letting out choked sobs as his frame adapted to the large intrusion.
Megatron leaned into him, he was only halfway in and already so close to his forge.
“You can take it.” he encouraged, kissing his neck plates. “Relax, let your body adapt.”
The Prime tried to calm down despite the obstacle that was bending out his abdominal grilles. Each vent made his valve give way bit by bit, expanding and adapting around the warframe’s spike. With one last push, the whole length was buried deep inside him.
Megatron moaned, enjoying the warmth and tightness of the younger mech’s insides, this derailment was unexpected on his behalf too, he hadn’t interfaced properly in cycles. But who was he to reject a pretty frame who was practically burning to have him?
He pulled out slow, his hands going to grip the floor between the Prime below, diving back in a slow rhythm that had him feeling every line and ridge. Optimus's soft moans fuelled the warframe's stamina, increasing the speed as the valve was able to take more and more.
The other one’s legs wrapped around the warlord’s waist a twitch of excitement ran through his circuits.
“More.” the Prime demanded in a low voice, almost timid to ask.
Megatron wasted no time, beginning to angle his thrusts, making sure to hit right on the deepest nodes. The smaller mech gripped his shoulders, meeting his hips as they moved in sync.
The faster he went, the louder his partner became, his expression lost in pleasure.
What an unexpected discovery this Prime was…
So correct and strict he seemed, now completely undone under him. Who would have known that under all that protocol hid such a lascivious mech. Megatron wondered if the civilian had repressed himself to the point it all blew in that exact moment.
That or any mate he might have had done a deplorable job.
He remembered, that pompous blue mech, the other Prime, by Blackarachnia’s account they had somewhat of a relationship, despite the subpar treatment to the other. How common of Ultra Magnus to enable that kind of behavior.
Oh to see their reactions, it would fill him with immense pride…
A knock on his chassis brought the warlord back to reality.
“Harder!” Optimus begged “Don’t hold back!”
“As you wish.” The warframe laughed, catching the Prime’s legs and pulling them over his shoulders. “Can you handle it?”
The civilian nodded in desperation, a piercing scream ripping out of his processor as he began to pound in with a brutal pace. His spike drilled into the deepest parts of the mech, feeling the inner callipers clench with excitement.
Optimus felt the smouldering heat the warlord emanated enveloping him, the fat tip of the spike was pressing against his forge seal, threatening to breach.
Not even in his best fantasies could he imagine the feeling of being filled by the Decepticon leader. It was pure ecstasy that he had not expected in the slightest; only in his mind the tyrant had been a distant delusion, something out of his league and far from reality.
Yet here he was, still grasping to understand that Megatron was right there, interfacing with him, all with an intensity he couldn’t have ever fathomed. A single sharp thrust right on his ceiling node breaching his forge and warframe fingers pinching his outer node were enough, sending the disgraced autobot over the edge.
“You’re close, are you little prime?”— said Megatron in his frenzied voice. “Show how much you enjoy being fragged by your enemy, overload for me!”
He screamed, so loud he was actually worried his team would hear, as he spasmed and thrashed while he overloaded, his senses numbed from the action.
Megatron wasn’t far behind, with a couple of thrusts he too reached his climax, dumping his thick transfluid right into the untouched forge of the Prime. He groaned, his massive frame pressing against the poor Prime’s overwhelmed one, watching every expression he made as he filled him to the brim.
Optimus let go of the Tyrant’s shoulders, dropping like a ragdoll onto the floor as he recovered, he felt so full, pleased for once in a very long time.
“I needed this…” he muttered, voicebox straining.
“I could tell.” The deception teased, remaining inside of him. “What a curious way of showing it you had, crashing the both of us into this primitive structure…”
The civilian tried standing, failing both to exhaustion and the giant mech on top of him.
“No one can know…” Optimus said, not daring to look at the other.
“Why not? You weren’t exactly rejecting me.” replied the warlord as he came closer to his neck. “Why should I hide the fact that I defiled one of Ultra Magnus’ pretty Primes?”
“That couldn’t be further from the truth” said Prime mentioned. “I am barely one in name.”
“Don’t devalue your skills just yet, you’ve proven yourself better than others that came before you. Even if it’s for only a fraction.”
The warlord pulled out, only just beginning to depressurise, leaving Optimus empty while transfluid slowly seeped out. Megatron incorporated, closing back his panels, not bothering to clean the paint transfers and lubricant left on his own frame.
“I won’t tell a spark for now, little prime, I got everything I wanted from you.” he said while dialling his troops.
[[Retreat, we have more than enough.]]
Optimus just stared at the broken ceiling, not even sparing a glance towards the warlord as he transformed and flew out without a word.
The autobot was left lying on the dusty floor, barely able to move, only stirred by the frantic comms of his medic.