Cover of Explosive Vows

Explosive Vows

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Shinju and Katsuki Bakugo just got married hours earlier, and are still dressed in their wedding attire, sweaty from the reception as they’re driving towards the spot they would spend the first couple nights of their married life. It’s a small beachside villa resort, and they reserved the honeymoon suite. They were so excited for their new life together, Shinju was excited for them to go house hunting and to decorate the house they would be raising their family in. As they’re driving towards the villa, Katsuki is focused on their future. They were both still heroes, although Japan’s heroes looked a little different now. Katsuki is determined to show Shinju how happy he is and how in love with her he is. When they walk into their suite, Katsuki immediately starts to strip Shinju from her wedding dress and Shinju starts stripping him of his wedding suit. They have an explosive first night as husband and wife.

Chapter 2: Discovery

The lingering scent of ozone from Katsuki’s earlier outburst mixed uneasily with the villa’s pervasive musk of damp wood and forgotten perfume. Kaiya’s tablet screen, clutched in trembling hands, cast a sickly blue glow across her pale face. The grainy security footage played on a loop: shadowed figures, indistinct but deliberate, skirting the villa’s overgrown perimeter throughout the afternoon. One paused, turning slightly towards the camera – a fleeting glimpse of a sharp jawline, a familiar tilt of the head beneath a hood.

Shinju’s breath hitched. Her vibrant energy, usually a tangible force, froze solid. Her knuckles whitened where she gripped Katsuki’s forearm. "Katsuki," she whispered, the name barely audible, yet it cut through the tense silence like glass.

He felt the tremor run through her. Saw the recognition – stark and chilling – flood her wide eyes. His own scowl deepened into something predatory, a low growl rumbling in his chest. "Who?" The single word was a demand, sharp as shrapnel.

"Later," Shinju breathed, her voice regaining a sliver of steel. "First, the gear." Her gaze snapped to Kaiya. "The black box. Reinforced. Where?"

Kaiya flinched under the dual intensity of their hero-mode focus. "S-storage closet! Down the hall, last door on the left! But… but the lock…"

Katsuki was already moving, Shinju matching his stride. "Lock’s the least of our problems," he barked over his shoulder, already halfway down the dim corridor. The faded grandeur felt oppressive now, the peeling wallpaper and dusty chandeliers mocking their urgency. Their footsteps echoed hollowly on the worn marble.

Shinju kept pace, her mind racing faster than her feet. The face on the screen… it couldn’t be. Not here. Not now. The joy of their wedding, the fragile bubble of their honeymoon, felt violently punctured. She pushed the rising panic down, focusing on the immediate objective: Get armed. Protect Katsuki. Protect Kaiya.

They reached the heavy wooden door Kaiya indicated. A sturdy padlock secured it. Katsuki didn’t hesitate. Sparks crackled at his palms, miniature suns igniting in the gloom. "Stand back."

"Wait!" Shinju hissed, grabbing his wrist. The heat radiating from his skin was intense. "The whole place smells like kindling, Katsuki. Remember the curtains?" She gestured vaguely back towards the suite. "One spark and this antique firetrap goes up." Her eyes scanned the doorframe, the lock mechanism. "Let me try something… quieter."

He grunted, reluctantly extinguishing the sparks, but his posture remained coiled, ready. Shinju closed her eyes for a fleeting second, drawing on a borrowed quirk – a subtle kinetic manipulation she’d absorbed years ago. She placed her fingertips lightly on the padlock shackle. A faint, almost imperceptible vibration hummed through the metal. Concentrating, she visualized the internal tumblers aligning, the mechanism yielding.

Click.

The lock fell open. Katsuki shoved the door inward before it even hit the floor.

The storage closet was a cramped cave choked with discarded furniture, rolled-up rugs smelling of mildew, and boxes labeled ‘Seasonal Decor - Do Not Open Before 2015’. Dust motes danced in the sliver of light from the hallway. And there, shoved unceremoniously behind a broken wicker chair, sat the matte-black, reinforced alloy case – their lifeline.

Katsuki lunged for it, hauling it out with a grunt. He slammed it onto a precarious stack of dusty linens. Thumbprint scanner. Retinal scan. The locks hissed open with satisfying precision.

Inside, nestled in custom foam, lay their tools: Katsuki’s gauntlets, sleek and menacing even dormant; Shinju’s utility belt, packed with specialized capsules and micro-tools forged by her creation quirk; comms units; reinforced undersuits.

They moved with practiced, silent efficiency, years of partnership overriding the chaos of the moment. Katsuki snapped his gauntlets into place with sharp, metallic clicks. Shinju secured her belt, the weight familiar and grounding. She clipped a comm unit to her ear, handing another to Katsuki.

"Kaiya," Shinju spoke into the comm, her voice calm now, the professional hero fully surfaced. "Status? Are you secure?"

The concierge’s voice crackled, breathless but trying for composure. "Y-yes! I’m in the main office. Doors locked. Security monitors active. I… I see movement! Near the east garden gate! Two figures!"

Katsuki slammed the case shut, his eyes blazing. "Directions."

"East side! Past the overgrown hibiscus hedge, towards the old service path!"

"Stay put. Stay quiet," Shinju ordered. "We’re moving."

They burst from the closet, transformed. Gone were the newlyweds. In their place stood Explosion Murder God Dynamight and Kurieitā, Pro-Heroes radiating lethal intent. They moved down the hall, not running, but with a predatory swiftness that ate up the distance. Katsuki’s palms glowed faintly, a contained promise of destruction. Shinju’s fingers brushed the capsules on her belt, ready to conjure shields, restraints, or something far less benign.

The grand, decaying villa felt like hostile territory. Every creak of the floorboards, every rustle of the ragged curtains in the sea breeze, set their nerves on edge. They reached a side door leading to the east gardens. Katsuki paused, listening intently. Shinju peered through the grimy glass pane.

Outside, the manicured lawns gave way to wilder, neglected gardens. Moonlight filtered through thick foliage, casting deep, shifting shadows. The humid air carried the scent of night-blooming jasmine and salt… and something else. A faint, acrid tang. Ozone? Or… something chemical?

Katsuki nudged the door open with his boot, slipping out silently. Shinju followed, her senses straining. The overgrown hibiscus hedge Kaiya mentioned loomed ahead, a dark, tangled wall. Beyond it, the faint outline of the old service path.

They flanked the hedge, Katsuki taking point. He signaled – two fingers pointing forward, then down. Targets ahead. Engage.

Shinju nodded, her heart hammering against her ribs, not with fear, but with the fierce, focused adrenaline of the hunt. And beneath it, cold dread solidified. The face on the screen… confirmation was moments away.

A twig snapped sharply to their left. Not on the path. Behind the hedge.

Katsuki whirled, gauntlets humming to life, bathing the foliage in an angry crimson light. "SHOW YOURSELF!"

From the deep shadow within the hibiscus, a figure stepped forward, deliberately slow. Hooded still, but the posture was unmistakably relaxed, almost mocking. A second figure emerged silently beside the first.

The lead figure reached up. Slowly. Deliberately. Pushed back the hood.

Moonlight fell on sharp, aristocratic features Shinju knew all too well. A face from a past she’d hoped was buried. Cold, intelligent eyes met hers, devoid of warmth, filled only with a chilling calculation. A thin smile touched lips she remembered whispering threats, not vows.

"Hello, Shinju," the figure said, the voice smooth as oiled silk, carrying effortlessly in the tense night air. "Did you really think marriage would erase your debts?" The smile widened, utterly devoid of humor. "Or did you forget who owns you?"

Shinju froze. Not in fear this time, but in a white-hot rage that turned her vision momentarily red. She heard Katsuki’s sharp, furious intake of breath beside her, felt the temperature spike as his Quirk surged. The name hung unspoken, poisonous, in the air between them.

Takami.

Her father.

The name landed like a physical blow. Takami. Her father. Not a ghost, but flesh and malice standing ten feet away. That aristocratic face, so like her own yet twisted into something unrecognizable by cruelty, was illuminated by the hellish glow of Katsuki’s gauntlets. The scent of ozone intensified, sharp and electric, mingling with the sickly sweet jasmine and the new, acrid chemical undertone Shinju couldn’t place.

"Who the fuck do you think you are?" Katsuki snarled, the words ripped raw from his throat. His body coiled, every muscle taut, explosions crackling violently in his palms, bathing the decaying garden in flickering, angry light. The promise of obliteration thrummed in the air. "You don't get to talk to her like that. Ever."

Takami didn’t flinch. His cold eyes, pale and calculating like chips of ice, slid past Katsuki’s fury to fix solely on Shinju. That thin, mocking smile remained. "Still relying on explosive guard dogs, I see. Predictable." His companion, hooded and silent, shifted almost imperceptibly beside him, a shadow within shadows. "The contract, Shinju," Takami continued, his voice a smooth, venomous purr. "Your mother signed it. Her bloodline binds you. You belong to the family enterprise. Did that little ceremony really make you forget?"

Shinju didn’t move. The white-hot rage crystallized into something colder, harder. A glacier formed in her chest. She remembered the faded legal papers, the desperate deals her mother made to survive before… before everything ended. Debts leveraged against her own future. Debts this man now thought he could collect. Her fingers twitched near her utility belt, not towards her capsules, but brushing the cool metal edge. Her Creation quirk hummed beneath her skin, ready, but she held it. Waiting. Assessing. Her father wasn’t stupid. He wouldn't be here without leverage, without a plan.

"Family?" Shinju’s voice cut through the humid night, low and dangerously steady. It lacked Katsuki’s roaring heat, instead carrying the chilling scrape of steel on stone. A stark contrast to her usual vibrancy. "You lost the right to call yourself that a long time ago." Her eyes flicked to the silent companion, then back to Takami. "What is it this time? Need someone to take the fall? Or just here to remind me you’re still breathing?"

Katsuki took a half-step forward, the ground scorching faintly beneath his boots. "The only thing happening here is you leaving in pieces," he growled, the light from his palms intensifying, casting grotesque, dancing shadows on the overgrown foliage. The air tightened, thick with imminent violence. "Try me."

Takami chuckled, a dry, humorless sound. "Impressive theatrics, boy. But pointless." He raised his hand slightly, a casual gesture. The silent companion reacted instantly, a small, dark canister dropping from their sleeve into their gloved hand. A soft hiss punctured the tense silence.

Katsuki reacted on pure, explosive instinct. "Get down!" He roared, pivoting, his gauntlet already flaring as he aimed to intercept. But Shinju was faster. Years of honed reflexes and accumulated quirks ignited.

Not gas. Barrier.

She didn’t create steel or stone. She visualized light. Hard light. A shimmering, translucent wall of pure photonic energy, dense as diamond, snapped into existence between them and the hissing canister just as Katsuki’s blast erupted. The explosion slammed against Shinju’s barrier with a deafening CRACK, washing over its surface in a wave of fire and force, but contained. The barrier held, vibrating violently, casting jagged, fractured shadows everywhere.

Behind it, the canister hit the ground near Takami's feet, erupting not in gas, but in a rapidly expanding cloud of thick, greyish-black smoke. It billowed outwards with unnatural speed, swallowing Takami and his companion whole in an instant, blanketing the path and the surrounding hibiscus hedge. The acrid chemical smell intensified, biting at Shinju’s nostrils. Smokescreen? Or something worse?

"Katsuki! Hold fire!" Shinju yelled, keeping the barrier stable, her arm outstretched, fingers splayed. She squinted, trying to pierce the swirling murk. The smoke rolled towards them, thick and obscuring. She couldn't see movement within it. Was it just cover? Or was it carrying something else? That chemical tang was wrong. Metallic. Sickly sweet beneath the burn. Her mind raced through possibilities: neurotoxin? Paralytic?

"Tch!" Katsuki snarled, lowering his gauntlet slightly, but his stance remained battle-ready, eyes narrowed to slits as he scanned the advancing smoke. "Cowardly bastard. Hiding in his own filth." He took a wary step back, instinct warring with the urge to charge in. The smoke reached the edge of Shinju’s light barrier, seeming to pool against it, like oil on water.

A faint buzzing reached Shinju’s ears. Subtle. Metallic. Coming from within the smoke cloud. Her blood ran cold. It wasn't just smoke. "Katsuki! Move!" She dropped the barrier, instantly creating a smaller, curved shield around them both just as something small, dark, and fast zipped out of the gloom. It impacted her shield with a sharp ping and fell, inert. A micro-drone? More followed, a half-dozen tiny, insect-like machines bursting from the smoke, buzzing erratically, colliding with her shield or veering off into the night. Distractions.

The main cloud surged forward, enveloping the spot where they’d just stood. Shinju felt a slight resistance against her shield – the smoke was thick, viscous. She pushed Katsuki back further. "Don't breathe it in!" The chemical stench was overwhelming now, clawing at her throat even through the shield’s protection. Her eyes watered.

Katsuki coughed, a harsh, involuntary sound. "The fuck is this shit?" He swatted at a drone near his face, his gauntlet sparking. His movements seemed… slightly sluggish. Shinju saw the slight stumble as he adjusted his footing.

Paralytic. The realization hit her like ice water. Airborne. Fast-acting. The drones were just cover, noise. The smoke was the weapon.

"You okay?" Shinju demanded, her voice tight with fear now, slicing through the buzzing drones and the ominous silence emanating from the heart of the smoke where Takami hid. Katsuki grimaced, shaking his head like a dog trying to clear water.

"Peachy," he gritted out, but his scowl was tight with effort. He raised his gauntlet again, aiming blindly into the swirling grey mass. "Gonna blast that whole fucking cloud sky-high."

"Wait—" Shinju started, but it was too late. Katsuki unleashed a controlled burst, a concentrated lance of explosive force spearing into the heart of the smoke. It tore a temporary hole, revealing… nothing. Just the overgrown path and the dark hedge beyond. Empty.

Takami and his companion were gone. The smoke, disturbed by the blast, began to thin, revealing the trampled grass where they’d stood. Only the lingering chemical stench and the faint, fading buzz of retreating drones remained, swallowed by the sounds of the ocean and the rustling night foliage.

"He ran?" Katsuki spat, disbelief warring with fury. "Fucking ran? After that?" He took a step forward, then stopped, swaying slightly. He planted his feet wide, bracing himself, a low growl escaping him. The paralytic was working, fighting his iron will.

Shinju let her shield dissolve, coughing as the residual chemical smell hit her lungs. Her own limbs felt heavy, like moving through syrup, though less severely than Katsuki. Her quirk reserves were vast, offering some resistance. She scanned the darkness, her senses hyper-alert. This wasn't over. Takami didn't make threats and vanish. He played long games. Where was he?

Kaiya’s voice, high-pitched with panic, crackled in their comms. "Mr. Dynamight! Kurieitā! Are you okay? The smoke… it triggered the fire alarms in the main building! Guests are waking up! Security is scrambling! And… and the cameras on the east path just went dark! All of them!"

Shinju froze, her blood turning to ice. Not gone. Redirected. The attack, the smokescreen, the drones… it was all noise. A diversion. Her eyes snapped towards the villa, towards the honeymoon suite, towards Kaiya locked in the office. Towards the other entrance.

"The box," she whispered, horror dawning. They’d retrieved their gear, but the reinforced case… where had they left it? Back in the storage closet? Or… No.

Katsuki followed her gaze, understanding slamming into him with brutal force. He roared, a sound of pure, frustrated rage, and tried to surge forward towards the villa. But the paralytic toxin had sunk its claws deep. His leg buckled. He crashed to one knee on the damp grass, gauntleted fist slamming into the earth in fury, the impact sending up a spray of dirt and torn grass. Helpless. "SON OF A BITCH! SHINJU, GO!"

The raw command tore from Katsuki’s throat, a guttural roar swallowed by the night. Shinju didn’t hesitate. Her legs, still tingling with the paralytic’s residue, propelled her forward, the villa’s decaying facade looming like a mausoleum. Every rustle in the overgrown hibiscus felt like a trap springing shut.

Katsuki remained kneeling, sweat beading on his brow as he fought the toxin’s icy grip locking his muscles. He strained, tendons standing out on his neck, forcing his gauntleted hand to splay on the damp earth. Miniature detonations crackled uselessly against the grass. Fucking useless! He needed movement, needed to be between her and that bastard. The acrid chemical stench clung to his tongue.

Inside, Shinju blurred past faded grandeur, her senses screaming. The villa felt altered, colder. Shadows seemed deeper, the usual creaks amplified into threats. She reached the main office door, locked tight. "Kaiya! It’s Shinju!" Her fist hammered against the wood, sharp and urgent. "Open up! Are you safe?"

Silence. Then, the frantic scrape of a chair and the deadbolt rattling. The door cracked open just enough to reveal Kaiya’s wide, terrified eyes. "H-he’s here! He came to the window! He just… stared!" Her voice trembled, knuckles white where she gripped the doorframe. "He said… he said to tell you—"

A smooth, cold voice sliced through the dim hallway, echoing slightly, seeming to come from everywhere and nowhere. "To tell her I haven't forgotten her mother's little 'accident' near the cliffs. So careless with heights, wasn’t she?"

The words hit Shinju like a physical blow, freezing the blood in her veins. Her mother. The jagged rocks below Moonlit Point. The official report: tragic misstep. Shinju’s vision tunneled, the decaying wallpaper swimming. That familiar, chilling voice continued, disembodied, amplified somehow through the villa’s old intercom system, maybe. "Or perhaps it was the convenient exposure to that neurotoxin… what was it called again? The one with the rather distinctive lilac scent?"

Lilac. Shinju remembered the faint, cloying floral note clinging to her mother’s coat that final day. Masking something else. Rage, white-hot and blinding, surged through her, momentarily eclipsing the paralytic’s chill. Her fist clenched, knuckles cracking. Beside her, Kaiya whimpered, shrinking back into the office.

"Show yourself, you coward!" Shinju snarled, spinning, scanning the shadowed corridor. Her creation quirk flared, ready to manifest anything – blades, shields, fire. But where to aim? The voice chuckled, a dry, grating sound devoid of warmth. "Temper, temper, Shinju. Just like your mongrel husband sputtering on the lawn. Pathetic."

Katsuki’s roar of pure, impotent fury echoed faintly from the garden, punctuated by another muffled explosion. He was fighting, hard. Shinju forced herself to breathe, to think past the red haze. He wants me rattled. Off balance. She locked eyes with Kaiya. "The security feeds. Main hub. Can you access it from here? Now!"

Kaiya scrambled back towards the desk, fingers flying across the keys. “What do you need me to access?”

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