Chapter 1: Jack fucks Arcee till she cums
The low hum of the Autobot base was usually a comfort to Jack, a steady white noise that signaled safety. Today, it felt like a static charge under his skin. He paced the length of the small human-scale observation platform, the gleaming metal and towering shapes of the Transformers beyond the glass feeling less like a refuge and more like a cage. His thoughts kept circling back to one thing, one person. Arcee.
It wasn't just a physical itch, though that was certainly part of it—a persistent, heavy warmth that had settled in his gut.It was her. The way her blue armor caught the light, the subtle hydraulic sigh she made when she was thinking, the surprising softness in her optics when she looked at him. Their moments together had been intense, stolen between missions in shadowy corners of the hangar. Earth-shattering, literally. But for Jack, they were starting to feel like unfinished sentences. He wanted more than the secrecy, the frantic, mechanical poetry of their coupling. He wanted… he didn’t have a name for it. He just knew he wanted her, all of her, not just the fragments they shared when no one was looking.
He found her in her usual corner of the repair bay, running a self-diagnostic. The soft blue light of her internal systems painted the area in faint, pulsating hues.
“Hey,” he said, leaning against a console. His voice sounded rough to his own ears.
Arcee’s head lifted, her optics brightening a fraction. “Jack. You’re twitchy. Everything okay?”
“Is it that obvious?”
“Your heart rate is elevated 18% above its normal resting rate, and you’ve taken 47 paces across the observation deck in the last ten minutes. So. Yeah.” There was a hint of amusement in her synthesized tone. “Mission anxiety?”
“No.” He pushed off the console and walked closer, until he was standing right beside her front wheel, close enough to feel the slight heat radiating from her frame. “It’s not about a mission.”
He reached out, letting his fingers trail over the smooth, cool metal of her fender. He felt her tense, a nearly imperceptible stiffening of her joints. The bay was empty, but not private. Ratchet could walk in.Bulkhead. Anyone.
“Jack,” she said, her voice a low whisper through her external speakers. “Here?”
“No.” His hand stilled. “Not here. Somewhere… just us.”
Her engine gave a soft, almost inaudible rev. She didn’t pull away. “The lower storage vault. Sector Seven sealed it after the cleanup. No one goes down there. No sensors.”
“Lead the way.”
The vault was a cavernous space, stacked with relics of forgotten human projects and rusted Decepticon debris. It smelled of dust, stale oil, and silence. Arcee transformed, her parts shifting and aligning with a series of precise clicks and whirs until she stood in her bipedal form. She leaned back against a colossal I-beam, the metal groaning softly under her weight.
The dim emergency lighting cut sharp angles across her plating, making her look both majestic and strangely vulnerable. Jack approached, the scale of her never ceasing to steal his breath. He was a speck next to her, and yet, in these moments, he felt like a giant.
“You’re quiet,” Arcee said. Her optical light was the brightest thing in the room, fixed on him.
“I just… I need this. You.” He began unbuttoning his shirt, his movements deliberate. The air was cool on his skin. “It’s more than just needing to… you know.”
“I know,” she said quietly. A panel on her lower abdomen hissed, retracting with a smooth mechanical sound. The revealed interior was a complex array of sensitive cabling and shimmering energy conduits, protected by a layered, flexible housing. It pulsed with a soft cyan light.
Jack let his clothes fall to the floor. His erection, already fully engorged, was a profound anatomical truth between them. At two feet in length and proportionally thick, it was a biological fact that made human intimacy an impossibility. But here, with her, it was the key to a lock only she possessed. It wasn’t grotesque; it was necessary. It was them.
Arcee’s optics widened, the light flaring. A short vent of air escaped her intakes. “Every time,” she murmured. “The sight of you… it overrides my sub-routines.”
He climbed onto a stack of crates to reach her, his heart hammering against his ribs. The familiar, clean scent of energon and heated alloy filled his senses. He guided himself, the sensitive head of his cock pressing against the intricate entrance of her interface array. Her plating was hot to the touch.
“Just us,” he whispered, more to himself than to her.
Then he pushed in.
The sensation was, as always, instantaneous and overwhelming. A tight, yielding heat that welcomed him perfectly, her internal calibrations adjusting to his unique size with a series of minute, thrilling vibrations. He sank deeper, the friction exquisite, until he was fully sheathed within her. A sharp, staticky cry escaped Arcee’s vocalizer, echoing softly in the vast space.
He began to move. There was no gentle preamble, not today. The restless energy that had plagued him all day channeled into a deep, driving rhythm. Each thrust was a full-bodied commitment, pulling nearly all the way out before plunging back into that gripping, radiant heat. The sound was obscene and beautiful: the wet, slick friction of their joining, the metallic creak of her frame against the I-beam, his own ragged breaths.
“Jack!” His name was a burst of distorted audio from her. Her hands, massive beside him, came up and braced against the beam, her fingers digging into the steel. “Your rhythm… it’s…”
“Tell me,” he grunted, not slowing. The base of his cock hit a cluster of sensory nodes with every inward stroke.
“It’s fracturing my concentration matrices.” Her voice was breaking up, laced with static. “I cannot… compile a coherent thought stream.”
He shifted his angle, driving upward. A brilliant arc of blue energy, like contained lightning, crackled from her interface panel, grounding itself against her thigh armor. She screamed, a raw, unfiltered sound of pure sensory overload. Her entire body shuddered, a massive tremor that ran through her frame and into the structure of the room.
She was climaxing. And she didn’t stop.
Wave after wave of charge seemed to rip through her. Her optics flashed violently, cycling through colors before settling on a blinding white. More energy arced and spilled, painting the dusty vault in strobes of azure light. Her vocalizer was stuck in a loop of fragmented gasps and truncated moans. Her internal muscles clamped around him in rapid, involuntary pulses, milking him with a rhythm that threatened to unravel his own sanity.He was close. The pressure coiling in his abdomen was a supernova waiting to happen. He reached up, pressing his palm flat against the heated glass of her chestplate, right over the spark chamber.
“Arcee. Look at me.”
Her head, which had been thrown back, lowered. Her optics were hazy, unfocused, but they found his.
“It’s you,” he said, the words torn from him. “It’s only ever been you.”
The confession, paired with the intense visual of her complete surrender, tipped him over the edge. His own release was a blinding white crash, a physical convulsion that emptied him into her glowing core. He held himself there, buried to the hilt, as the last shudders racked through both of them.
The silence that followed was thick, broken only by the slow hiss of her cooling systems and the drip of fluids onto the concrete floor far below. Jack slipped out of her, the sudden absence of connection feeling profound. He slumped against her warm leg, his energy utterly spent.
Arcee’s optics had dimmed to their usual level. She was motionless for a long moment. Then, with a gentleness that belied her strength, one of her massive fingers came up and stroked the damp hair back from his forehead.
Then, with a gentleness that belied her strength, one of her massive fingers came up and stroked the damp hair back from his forehead.
“You wreck me, Jack Darby,” she said, her voice a low, warm thrum. It was barely louder than the hum of her spark. “Every single time.”
He leaned into the touch, the metal smooth and surprisingly comforting. “Good.” He kissed the tip of her finger, a ridiculous gesture given the scale, but she went very still. “That makes two of us.”
For a while, there was just the sound of their breathing—his human lungs drawing air, her systems cycling with a soft, rhythmic purge. The afterglow was a tangible thing, a quiet field between them in the dusty vault. Jack eventually slid down to sit on the crates, legs dangling. He watched her, this warrior who carried him into battle, now looking... contemplative.
She shifted then, with a series of smooth, hydraulic motions. She pushed away from the I-beam and lowered herself to the floor of the vault. The concrete shuddered once under the weight. Then she reclined, leaning back onto her elbows, stretching her full length along the ground. Her optics never left him.
And then, slowly, deliberately, she spread her legs.
It wasn’t just a physical adjustment. It was a presentation. An offering. The dim light caught the seams of her armor, the elegant lines of her chassis flowing down to the exposed, still-glimmering interface array at her core. Energy pulsed there lazily, a beacon in the semi-darkness. She held the pose, utterly still, a statue of impossible desire. Every line of her body was open, vulnerable, and defiantly seductive.
“Your turn,” she said, the words simple. Her head tilted, a ghost of a challenge in the angle. “You wanted more than just the physical. So look. See all of me. This is what you do. This is what you get.”
Jack’s breath caught. He’d seen her in every conceivable context—transforming, fighting, repairing, laughing. But this was different. This was Arcee, consciously choosing to display herself not just for function, but for him. It was more intimate than anything they’d just done. The sheer trust of it lodged in his throat.
He slid off the crate, his feet hitting the cool floor. He walked toward her, a pilgrim approaching an altar. He stopped beside her hip, his own nakedness feeling inconsequential next to the powerful landscape of her form.
“You’re incredible,” he murmured, his voice thick. He reached out, letting his hand rest on the curve of her armored thigh. It was warm. “And you’re avoiding the question.”
“What question?”
“When do we stop being a secret?” His hand traced a path upward, following a cable housing. “When do we get to have this without hiding in a scrap vault?”
Her optical light flickered. A sign of processing, of emotion she couldn’t fully filter. “You know why we hide. The others… Ratchet would call it a critical systems failure. Bumblebee wouldn’t understand. Optimus…”
“Optimus would probably give us a lecture on inter-species dynamics and tactical vulnerabilities,” Jack finished, a wry smile touching his lips. He climbed up onto her lower abdomen, settling himself in the space she had made for him. He lay back, his body pressed against the warm metal plane of her torso, staring up at the distant, shadowed ceiling. Her scent enveloped him. “I don’t care.”
“I do,” she said. Her voice came from all around him, a gentle vibration through her frame. “Your safety is my primary directive. This… complicates that algorithm.”
“Life is complicated.” He turned his head, pressing his cheek against her. “This feels simple. Right here. Right now.”
One of her hands came up, curling around him loosely, not to confine, but to cradle. He was surrounded by her. “It does,” she admitted, a soft concession. “But the moment we leave this vault, the complexity re-engages. You have a mother, Jack. A life. This… us… it defies every protocol for a reason.”
He was quiet for a minute, listening to the deep, resonant thrum of her spark, much closer now. It was a sound that lived in his bones.
“What if I don’t want a normal life?” he finally said. “What if I want this? The danger, the giant robots, the girl made of lightning and steel who can’t stop cumming when I—”
A sharp, playful jolt of energy, harmless but tingling, zapped through the metal beneath him. He yelped, laughing.
“Watch it,” she teased, the static smile in her tone. But then it faded. “You say that now. But humans change. You’ll want things I can’t give you. A home that isn’t a military base. Children. A... smaller boyfriend.”
The word ‘boyfriend’ sounded so bizarre coming from her, so achingly human and mismatched, that it made his heart clench. He pushed himself up on his elbows, looking down the length of her body toward her face.
“Arcee, look at me.” She tilted her head back, optics meeting his. “I’m not asking you to be human. I’m asking you to be with me. However that works. We’ll figure out the rest as it comes.”
Her gaze held his. The vault felt vast and silent, holding its breath.
The vault felt vast and silent, holding its breath. Arcee’s optics dimmed slightly, a slow blink in the gloom. Her hand around him tightened, just a fraction, a possessive pressure from a being who could crush stone.
“You say ‘figure it out,’” she echoed, her voice a low rumble. “That is not a strategy. It is hope. Hope is a data point, not a protocol.”
“Since when do you live only by protocol?” Jack challenged. He sat up fully, straddling the warm plating of her lower abdomen. The afterglow was fading, replaced by that familiar, stubborn heat coiling back in his core. Seeing her like this, spread out beneath him, trusting and formidable all at once, rekindled the fire. “You broke protocol when you saved me that first day. You break it every time we do this.”
“Those are calculated risks.” Her other hand came up, a massive blade-tipped finger hovering near his hip. The sharp point traced a line down his thigh, not breaking skin, but raising goosebumps. “This is a sustained systemic compromise.”
“Stop analyzing,” he breathed, leaning into the dangerous touch. “Just feel.”
He lowered himself, grinding his renewed erection against the intricate, still-glistening architecture of her interface array. The contact sent a jolt through both of them. A sharp hiss of pneumatics escaped her.
“Jack—”
“Tell me you don’t want it again,” he murmured, his mouth near a seam in her armor. He licked the metal, tasting ozone and salt. “Tell me your systems aren’t already cycling back up, craving the overload. Tell me to stop.”
Her silence was the only answer he needed. It was a roaring, potent thing.
With a groan, he positioned himself and sank back into her. This time, the entry was smoother, her internal mechanisms already calibrated, welcoming him with a hungry, wet clutch. The sensation was even more intense, a familiar homecoming that stole the air from his lungs. He braced his hands on her abdominal plating, fingers splayed, and began to move.
This wasn’t the frantic, driven pace from before. This was deeper, more possessive. Each stroke was slow and deliberate, a full, breathtaking withdrawal followed by a penetration that bottomed out inside her with a soft, metallic click of perfect alignment. He watched his own body disappear into the luminous, complex fold of her, a surrender of flesh to shimmering alloy.
“Fuck,” he grunted, the vulgarity ripped from him. “You’re so fucking perfect. This… this is where I’m supposed to be.”
Arcee’s vocalizer emitted a broken, staticky moan. Her hands came down to clutch at his back, her fingers careful but desperate, pressing him down against her. “Affirmative… affirmative…” she chanted, the word losing its meaning, becoming a raw signal of pleasure. Her hips lifted, meeting his downward drives with a powerful rock of her own, the force of it threatening to shake him loose. He held on, riding the colossal motion.
The pace quickened, necessity overtaking finesse. The wet, rhythmic slaps of their joining filled the vault, echoing off the distant walls. Jack’s world narrowed to the feeling of her impossibly tight channel milking his length, to the sight of energy crackling and spitting from her seams with every deep thrust. Her optics were wide, blindingly bright, fixed on the ceiling but seeing nothing.
“I’m close… again,” she warned, her voice distorting.
“Then come,” he commanded, driving into her harder, each impact jarring his bones. “Come all over this cock. Show me what I do to you.”
The vulgarity, the command, shattered her last vestiges of control. Her back arched violently, her entire frame seizing as a torrential release stormed through her systems. This one was different—deeper, longer, a cascading system failure of pleasure. Fluid, warm and slick and buzzing with faint charge, gushed around his plunging shaft. Cyan light flared in pulsing waves from her core, illuminating the vault in stark, surreal flashes. She screamed, a continuous, ragged sound of ecstatic ruin.
The visceral proof of her climax, the hot spill of her around him, tipped Jack over the edge. With a final, brutal drive that buried him to the hilt, he came. His release was a blinding white-out, a silent roar behind his teeth as he emptied himself in deep, pulsating waves into her radiant depths. He collapsed forward, his body smearing against her heated plating, spent and trembling.
For long minutes, there was only the sound of their syncing down—his panting breaths, the slow, deep whir of her cooling fans, the soft drip of fluids. The smell of sex and hot metal was thick in the air.
Jack nuzzled the smooth metal beneath his cheek. “Compromise, huh?”
Arcee’s systems gave a final, settling sigh. One of her hands came up and rested heavily on his back, a grounding weight. “A catastrophic one,” she murmured, but the static in her voice was soft, satiated.
He was drifting, fatigue pulling at him, when her body tensed beneath his. Her cooling fans cut off abruptly.
“Jack.” Her voice was a wire-taut whisper. “Get up. Now.”
The urgency in her tone was like a splash of ice water. He scrambled off her, his feet hitting the cold floor. “What? What is it?”
She was already moving, transforming with a speed that belied their recent exertion. Parts shifted and aligned, and in seconds she was in her motorcycle form, engine idling with a low, anxious purr. Her front wheel nudged urgently at his discarded clothes.
“Get dressed. A proximity alert just pinged my internal grid. Someone accessed the outer vault door.”
Shit. Jack grabbed his clothes, yanking them on with clumsy hands. The intimacy of moments ago evaporated, replaced by a cold, sharp fear. “Who? Ratchet? Bulkhead?”
“Unidentified. The security protocol is Autobot in origin, but the signature is… scrambled.” Her headlight flicked on, cutting a beam through the dusty gloom. “We need to leave. A different way.”
“A different way? There’s only one door!”
Her engine revved. “Not anymore.” She angled herself toward a shadowed section of the wall, stacked with decrepit human machinery. “That ventilation shaft leads to the primary coolant ducts. It will be tight, but I can fit. You’ll have to follow on foot inside me. Now.”
The reality of the situation crashed down. They weren’t just caught having a forbidden moment. They were potentially compromised. Someone had found their secret. The ‘figuring it out’ he’d so casually demanded was now a pressing, dangerous problem with an unknown face.
As he fastened his jeans and swung a leg over her seat, the warmth of her frame against his thighs felt different. It wasn’t just pleasure now. It was a shared secret, and it might have just grown teeth.
“Hold on,” she said, and her voice was all business, the lover gone, the soldier back in place. But as she powered toward the wall, about to transform and tear an escape route into the ducts, she added one last, quiet transmission, for his audio only. “The compromise stands.”
Then she revved her engine, and the vault was filled with the sound of shattering metal as they plunged into the dark.