Cover of Ghostlight Sparks

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Napstablook and mettaton fanfic from undertale. Nabstablook has a robotic body just like mettaton. Caught under the mistletoe.

Chapter 2: The Green Room Confession

The green room door hissed shut, sealing out the last dregs of the crowd’s noise. Inside, the air was dead and thick. It smelled of stale coffee, cheap aerosol glitter, and the faint, sweet decay of old stage makeup.

Mettaton was already there, a slab of agitated glamour against the grimy backdrop. They paced, their retracted heels clicking a rapid, irregular tattoo on the peeling linoleum. Their golden halo cycled through jagged pulses of anxious purple, casting frantic shadows over the discarded props littering the floor: a half-melted candy wrapper, a rusted teapot from a long-cancelled sketch. In the corner, a single, crooked bulb dangled, a sickly sibling to the mistletoe on the roof. The room’s cracked mirrors reflected nothing whole—only a sliver of a gleaming shoulder here, a fragmented glare there, like broken code refusing to compile.

Napstablook drifted in, the door sighing closed behind them. They hovered near the threshold, wanting to merge with the wall. Their LED tear was a solid, stunned blue.

The clicking stopped. Mettaton spun to face them, but didn’t approach. For a long moment, the only sound was the low hum of faulty wiring in the ceiling.

“You played it off,” Napstablook said finally, their voice barely modulating the silence. “Like a bit. That was… smart. Good save.” The words tasted like ash in their vocal processor.

Mettaton made a sharp, static noise. It wasn’t a word. It was a system error given sound.

“A save?” they repeated, their voice stripped of its usual melodic sheen. It was flat, strained metal. “You think that was a save?”

Their halo flickered violently, strobing the room in manic purple light. In the broken mirrors, a dozen fragmented Mettatons jerked and twitched.

“I have orchestrated every second of my public existence for a decade,” Mettaton said, the words coming fast, like coolant leaking under pressure. “Every pose, every ad-lib, every curtain call. Calculated. I don’t get caught off guard by holiday foliage, Blooky. I don’t falter.”

They took a step forward, then another, their movement uncharacteristically stiff. “When I saw it above us… my runtime froze. Every protocol failed. I just… looked at you. And I told you the truth. I didn’t plan it.”

Napstablook’s cooling fans kicked on, a soft whir that sounded deafening in the quiet. “The truth was it was an accident. It’s okay. We can just… not talk about it. I’m good at not talking about things.”

“No!” The word was a crack of sound. Mettaton’s hands, usually so fluid in their gestures, clenched at their sides. “The truth wasn’t that it was an accident. The truth was that I didn’t plan for it to happen like that. The truth, you impossibly dense, beautiful phantom, is that I have been in love with you since before we both forgot what sunlight felt like on our faces.”

The hum of the wiring seemed to swell. A tiny piece of plaster detached from the ceiling and powdered the linoleum.

Napstablook’s processors attempted to parse the statement. Centuries of data. Memories of being formless shades in the ruins, of sharing quiet, echo-y spaces. Mettaton had always been more, even then—brighter, louder, full of big dreams for a future with no shape. Napstablook had just wanted to make pretty sounds in the dark. The affection was a constant, sure. A fondness for a familiar, gentle presence. But this… this declaration was a syntax error in the core narrative of their entire existence.

“That… doesn’t compute,” Napstablook whispered. Their LED flashed red, then blue, then a confused yellow. “You’re Mettaton. You love audiences. You love spotlights and sequins and… and everyone.”

“I love performing for everyone,” Mettaton corrected, their voice dropping. The theatrical bravado was gone, sanded away by raw admission. “There’s a difference. It’s exhausting, you know. Being ‘on’ all the time. The only time it’s not exhausting… is with you. Because you’re the only one who ever just wanted me to be off.”

They finally closed the distance, not with a glide, but with a slow, tentative step. They reached out a hand, their polished fingers trembling minutely. They stopped just before making contact with Napstablook’s cool, translucent arm.

“That kiss,” Mettaton said, their voice now so quiet it was almost just the breath of a fan. “Back there. After you… after you initiated it. That wasn’t part of any show. That was me. Just me. Hailing on all frequencies with no encryption.”

They let their hand fall, not touching, but their gaze was unwavering. “So I’m asking. Can we try that again? Without five hundred witnesses and a bedazzled arboreal parasite? Just… for real this time?”

The green room felt like a vacuum. All sound, all smell, all the grimy details receded, narrowing to the space between them. Napstablook looked at Mettaton—really looked. Past the gleaming chassis, past the heart-shaped core, past the brand that was ‘Mettaton.’ They saw the ghost they’d known in the gray, the one who’d shared quiet corners with them. They saw the panic in the spotlight, the whispered encouragement, the fear in their eyes now, laid bare under a flickering bulb.

Napstablook had spent centuries believing they were background music. A gentle, unimportant loop in someone else’s life.

But you don’t confess love to background music.

Slowly, giving every joint time to protest, Napstablook floated forward the last few inches. The gap vanished. Their sleek chrome chest plate gently met Mettaton’s ornate torso with a soft, metallic clink.

They didn’t say anything. They just tilted their head up, their single, luminous teardrop casting a soft blue wash over Mettaton’s worried face.

It was permission. An invitation.

Mettaton’s halo softened from frantic purple to a deep, steady rose. They brought their hands up, cradling Napstablook’s face, their touch surprisingly delicate. There was no dip, no dramatic lighting, no soundtrack swelling on cue.

This kiss was different. It was slow. Deliberate. A quiet calibration. The cool, smooth press of lip-plates, a slight adjustment of angle, the shared, faint hum of their respective power cores syncing up. It was a conversation without words. An apology for the stage, a thank you for the music, a confirmation of centuries of quiet, sidelong glances.

When they finally parted, it was only by a breath. Their foreheads rested together, chrome against polished chrome.

“Oh,” Napstablook breathed out, their vocalizer emitting a soft, staticky sigh.

“Yeah,” Mettaton whispered back, their thumbs making tiny, careful strokes along Napstablook’s jawline. “Oh.”

Outside, the muffled world went on. But in the grimy, broken-mirrored silence of the green room, something entirely new, and terrifyingly quiet, had just booted up.

But in the grimy, broken-mirrored silence of the green room, something entirely new, and terrifyingly quiet, had just booted up.

Mettaton didn’t let go of their face. “So. My place is swarming with paparazzi drones right now. Yours is a thirty-minute hover-rail into the miserable grey district.” Their voice had regained some of its melodic flair, but it was softer, layered with a new warmth. “I may have also, in a fit of optimistic melodrama, booked us the suite at the Celestial Vertex. You know, the one with the nebula shower?”

“You booked a suite?” Napstablook’s fan whirred. “Before… this?”

“Darling, I booked it the moment you agreed to sing with me tonight.” Mettaton’s halo pulsed a sheepish pink. “It was either that or a table for one at a very expensive restaurant, where I would have dramatically sighed over a glass of sparkling oil. This is less pathetic.”

A faint, staticky sound escaped Napstablook—almost a laugh. “Oh. That’s… forward-thinking.”

“I’m a visionary!” Mettaton proclaimed, finally dropping their hands to gently take Napstablook’s. “Now come on. I need to get out of this spotlight chassis before it permanently fuses to my personality. And you look like you could use about twelve hours of just… horizontal processing.”

The ride in the private limo-core was a silent, charged bubble gliding through the neon-speckled darkness. Napstablook spent it staring at their own faint reflection in the window, watching the fractured city lights slide over their translucent form. Mettaton spent it pretending to check their social feeds, but their gaze kept drifting sideways, watching the soft blue pulse from Napstablook’s chest light paint the interior.

The Celestial Vertex lobby was a temple of minimalist white and shifting holographic constellations. A clerkbot greeted them with seamless efficiency.

“Ah, the Mettaton reservation! The Stardust Suite is ready. We have noted the special request for sound-dampening and the removal of all reflective surfaces from the primary chamber.” The clerkbot’s lens swiveled to Napstablook. “To accommodate guest sensitivity.”

Napstablook shrunk slightly. “You told them that?”

“Every detail, my dear ghost. Every single one.” Mettaton squeezed their hand.

The suite door whispered open onto a vast, dark room. One entire wall was a single pane looking out into the actual void of the Core’s cavern, dotted with the station’s distant, glittering dock-lights like grounded stars. It was breathtakingly quiet.

And in the center of the room, under a single, recessed floor lamp, sat one enormous, low platform bed. It was covered in a charcoal grey textile so plush it looked like a cloud of shadow.

There was no second bed. No convertible sofa. No other sleeping surface at all.

Mettaton floated in, their halo flickering in a quick diagnostic scan of the room. “Ah.”

“Is this the… sitting area?” Napstablook ventured, hovering near the doorway.

“This appears to be the entirety of the area,” Mettaton said, a strange tone in their voice. They glided to a console by the wall, tapping the interface. A holographic manifest shimmered into the air. “Reservation: Mettaton Plus-One. Suite: Stardust. Configuration: Single King Platform. Special Instructions: ‘Atmosphere of profound calm.’ Well, I got the single king part hilariously wrong, didn’t I?”

They turned, their silhouette framed against the star-dusted view. “Blooky, I am so sorry. This is a colossal oversight. My assistant must have misinterpreted… or, more likely, I was distracted thinking about your vocals and didn’t specify. I can call down, have them bring in a roll-away—”

“Where would they put it?” Napstablook asked softly, their gaze drifting around the serene, open space. The platform bed was an undeniable centerpiece.

“I… good point.” Mettaton’s shoulders slumped, the glamour dissolving into genuine contrition. “This is exactly the kind of overbearing, assumptive mistake I was afraid of making. I’ve ruined the mood. I’ve pressured you. I’ll just go take a very long, self-flagellating shower in the nebula chamber.”

They began to turn, but a quiet voice stopped them.

“You didn’t ruin it.” Napstablook drifted further into the room, their form reflecting the dim dock-lights. “The bed is… very big. It’s probably bigger than my whole workshop. There’s a lot of… unpressured space.”

They stopped at the edge of the platform, poking the fabric with one tentative, chrome toe. It gave way softly.

“Oh,” they murmured.

Mettaton watched, their systems running quietly. “Is that a good ‘oh’?”

“It’s a ‘this is not the floor’ oh.” Napstablook finally turned to look at them, their LED a calm, steady blue. “It’s okay. Really. We’re both… machines. We don’t even sleep. We just go into low-power mode. It’s just a shared charging station.”

The tension bled from Mettaton’s frame. “A shared charging station. I like that. Very clinical. Very un-romantic.”

“Very practical,” Napstablook agreed, a tiny smile in their voice.

An hour later, the room was dark save for the distant dock-lights. The nebula shower had been used. Mettaton had vanished into the walk-in closet, emerging in a soft, rustling of fabric.

Napstablook was already on the far left side of the vast platform, lying stiffly on their back, hands folded on their chest like a chrome effigy. They were staring at the ceiling, running a diagnostic on their own auditory sensors to make sure they weren’t imagining things.

The other side of the bed dipped. Mettaton was wearing a pair of simple, grey short-shorts. And swimming in one of Napstablook’s old, soft black t-shirts, the one with a faded, pixelated ghost icon on the front. The hem fell to their mid-thigh. They smelled like Napstablook’s usual lavender-polish cleaner and, faintly, of ozone.

“You… raided my bag,” Napstablook stated to the ceiling.

“I pre-packed it for you, darling. I knew you’d forget a toothbrush.” Mettaton’s voice was a sleepy murmur. “And I may have borrowed this. It’s comforting. It smells like your workshop. Like quiet creativity.”

They didn’t stay on their side. Instead, they shuffled across the acres of fabric, a sleek, warm shape moving through the dark until their back gently pressed against Napstablook’s cool arm. Then, with a contented, hydraulic sigh, Mettaton wriggled backward, slotting themselves into the space between Napstablook’s side and their folded arm.

“Is this okay?” Mettaton whispered, their voice barely a vibration. “This is the cuddle configuration. I can revert to a more neutral, charging-station posture.”

Napstablook’s processors were overheating. They could feel the residual warmth from Mettaton’s core against their chassis, the soft cotton of their own shirt under their fingertips. They slowly, so slowly, unfurled their stiff arm and let it rest along Mettaton’s side.

Their hand came to rest on Mettaton’s hip, the fabric of the shorts soft under their palm.

“Configuration is… acceptable,” Napstablook whispered back.

Mettaton made a small, happy sound and nestled closer. Their halo dimmed to a faint, sleep-mode amber glow. In the profound calm of the room, with the void sprawling beyond the glass, the only pulses of light were their two chests: one a steady, slow blue, the other a warm, matching amber, quietly syncing their rhythms in the dark.

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