The idea arrived before she'd even left the throne room, the way her best ones always seemed to, sideways, uninvited, mid-conversation with something else entirely.

"...The tunnel," she said slowly, half to herself, half still addressing the vast shape on the throne. "The original one. The angled shaft the boring rig cut, going up toward the surface. That's still just sitting there, right? Nobody's built anything into it since the breakthrough."

"It remains as your crew left it," Beelzebub confirmed. "A tunnel. Nothing more. My people climb it the same way they've climbed it since the day it opened."

"What if it wasn't just a tunnel anymore." Arista's stylus was already moving, notebook open before she'd consciously decided to pull it out. "What if I build a proper elevator into it. A whole car, running the length of the shaft, angle and all."

She sketched fast, the shape of the problem falling into place in the specific, satisfying way it always did once she found the right angle to attack it from.

"Going up is the hard direction, that's where all the actual force needs to go, same problem as the gravity bike, except inverted. So: line the bottom of the car with cloud material. Same stuff as the shield, same stuff as the wingsuit, absorbs shock, doesn't fight force, just cushions it. If something goes wrong on the way up, worst case is a rough bounce instead of a catastrophic fall."

She flipped to a fresh page, sketching the shaft in cross-section.

"But going down, that's actually easy. That's basically free. Angle the track right, and the car doesn't need force at all going down, just controlled resistance so it doesn't build up too much speed. Like a bobsled run. Gravity does all the work, I just need brakes."

"...Force," she murmured, chewing the end of her stylus, staring at the uphill half of the sketch. "Force is the actual problem. Something's got to pull that car up four kilometers of angled shaft, repeatedly, reliably, without needing four people cranking a wheel until their arms fall off."

Steam came to mind first, obviously, she'd already proven the principle worked, already had a prototype humming away back at the Republic. "Steam engine could do it. Continuous force, no crew fatigue, same logic as the conveyor belt." She tapped the sketch, already running the numbers. "Downside is fuel. I'd need to haul wood or whatever burns down here, and Hell's not exactly overflowing with forests to harvest."

Her eyes drifted, almost involuntarily, toward the massive hellhound still seated calmly by the throne room doors, three meters at the shoulder, patient and enormous and radiating a kind of raw, contained power that made her original urge to pet it suddenly seem even more reckless in retrospect.

"...Or." She grinned, the idea shifting sideways again. "What if the force isn't mechanical at all. What if it's biological. A mill-type mechanism, like an old-fashioned horse mill, except instead of a horse walking in a circle, you've got one of those." She nodded toward the hound. "Or a few of them, rotating in shifts, turning a capstan that winds cable up the shaft. No fuel required, no forests to harvest, just... whatever hellhounds eat, which I assume is considerably easier to source down here than firewood."

She glanced up at the throne, suddenly aware she'd been thinking out loud in front of the actual ruler of the realm for the better part of several minutes.

"...Sorry, is that, is it possible? Are hellhounds actually strong enough for something like that, or am I about to insult an entire species by comparing them to a farm animal?"

Beelzebub's laugh, when it came, shook dust from the rafters all over again: but this time it sounded, unmistakably, like something closer to approval.

"They would consider it beneath them to be compared to a horse," he said, "but they would also flatten a mountain if properly motivated. Strength was never the concern with my hounds, Strawberry. Only ever finding something worth their effort."

Arista's grin spread slow and dangerous, the exact expression that had, by this point, preceded every genuinely world-altering thing she'd ever built.

"...Then let's find them something worth their effort."

Arista kept talking, mostly to herself now, the way she always did when a problem hadn't quite finished unfolding yet.

"...I really wanted to use a steam engine, though. It's proven, it's reliable, I've already got the design worked out." She frowned at her own sketch. "The whole issue's just fuel. Heat. I need something constantly hot enough to keep water boiling, and Hell's not exactly got forests lying around for me to—"

"You are aware," Beelzebub interrupted, with the specific, deliberate patience of someone repeating something that should have been obvious, "that you are standing in literal Hell. We have canals flowing with molten lava that have not cooled since before your race first crawled out of whatever primordial swamp birthed it."

Arista blinked.

"...Is the heat constant?"

"As far as I am aware, yes." A pause, something amused threading through the words. "It has been constant for rather a long time now."

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"...Oh."

The silence that followed lasted just long enough for the full, obvious weight of it to land properly, an entire realm's worth of free, endless, zero-maintenance heat, sitting directly beneath her feet this entire time, while she'd been mentally drafting logistics for hauling firewood down a four-kilometer shaft.

Beelzebub's laugh rolled through the hall again, shaking loose dust from the rafters, unmistakably delighted this time rather than merely amused.

"I see even the Mother of Industry overlooks the obvious occasionally."

"...In my defense," Arista said, a little sheepish, already flipping to a fresh page and scribbling LAVA. HEAT SOURCE. WHY DID I NOT THINK OF THIS in letters considerably larger than her usual notes, "I've spent the last several months thinking in terms of forests and firewood, because that's what every other kingdom actually has. Nobody mentioned the endless free heat until just now."

"Nobody thought they needed to. It is somewhat implied by the name of the realm."

"Fair. Extremely fair." She was already sketching a rough heat-exchange system, a sealed water chamber positioned near a lava channel instead of a firebox, letting ambient heat do the boiling work without so much as a single log burned. "Okay. This actually solves everything. No fuel logistics at all. Just position the boiler near an existing lava flow, and the heat's just... there. Forever. Genuinely renewable in the most literal sense possible."

She kept sketching for a moment longer, then glanced back up, the earlier momentum of the conversation catching up with her.

"...Anyway. Separate topic, but while I've got you, could I maybe borrow the dogs? Later, I mean. For the elevator thing." A beat. "Beelz?"

The hall went very, very quiet.

Somewhere near the throne room doors, one of the guards made a small, strangled noise that might have been a cough.

"...Beelz," Beelzebub repeated, slowly, in the exact tone of a being who had genuinely not been addressed that way in several millennia of ruling absolute torment and suffering.

"Too far?"

"...No," he said finally, and if Arista wasn't very much mistaken, there was something almost fond buried beneath the enormous weight of his voice. "No, I believe I find it fitting, coming from you specifically. Yes, Strawberry. You may borrow the hounds."

Arista grinned, already scribbling ASK ABOUT HOUND SCHEDULING directly beneath her lava notes.

"Great. This is going great."

The throne room remained quiet after Strawberry left, quiet in the specific, unsettled way a room goes quiet after something has happened that nobody present quite has the vocabulary to process yet.

For several long seconds, nobody moved. The guards had witnessed a great many strange things over their years in service, demonic invasions repelled without ceremony, ancient rituals conducted at hours that made no sense to mortal bodies, the occasional overconfident hero who arrived certain they could challenge the ruler of Hell and left, if they left at all, considerably less certain of anything. But none of it, in all their collective centuries of guarding this particular throne, had prepared them for watching someone walk in, address the Lord of the Seven Hells by a nickname, request the personal use of his hellhounds, and simply walk back out again with permission granted.

It was the younger of the two guards nearest the door who finally broke the silence, testing the word carefully, almost experimentally, the way a person might test ice before committing their full weight to it.

"...Beelz."

The older guard beside him turned with the particular speed of a man who had heard something go badly wrong before it had actually finished happening yet.

"Don't."

"What? She did it." The younger guard's grin was already forming, the easy, unbothered confidence of someone who genuinely believed the rules that applied to everyone else simply hadn't caught up to him personally yet.

"She is Strawberry."

"She is a demon blacksmith with a notebook."

"She is Strawberry," the older guard repeated, with the flat, exhausted patience of a man who had clearly had some version of this exact conversation before and lost.

The younger guard glanced toward the doorway Arista had disappeared through, weighing the older guard's warning against his own certainty, and finding, apparently, that his certainty weighed more.

"How hard can it be?"

Something in the room's temperature seemed to shift, subtle enough that it might have been imagination, if the older guard's expression hadn't confirmed it wasn't. He closed his eyes.

"You're about to learn something important."

The younger guard, entirely undeterred, straightened his posture and raised his voice toward the throne with the exaggerated formality of someone performing bravery he didn't quite feel.

"Lord... Beelz. May I have tomorrow off?"

Silence answered him first, long enough that he'd nearly relaxed into it. Then a single fly landed on his helmet.

He smiled, a little nervously now, glancing sideways at the older guard as if for validation. "...See? Nothing happened."

A second fly landed. Then several more, in quick succession, and within the space of a few breaths the low, gathering hum of wings had become impossible to mistake for anything else. The swarm arrived the way weather arrives, not all at once but in a steadily building pressure that made the air itself feel thicker, until the guard stood at the center of a living, shifting cloud, flies covering his armor, his helmet, every exposed inch of metal he had.

"Uh," he said, with the specific, flattened tone of a man recalculating every decision that had led him to this exact moment.

The voice from the throne, when it came, was calm in a way that somehow made the swarm feel considerably worse.

"Interesting."

The flies tightened around him.

"Strawberry uses the name because she does not understand its significance. She treats me as a person." A pause, weighted, deliberate. "You used it because you thought it would be entertaining."

The flies buzzed louder for a moment, then settled into an odd, expectant stillness, as though waiting to see whether their point had actually landed. The older guard took the opportunity to step quietly out of range, putting a careful, deliberate distance between himself and whatever was about to happen next.

"Wait," the younger guard managed, voice muffled beneath the swarm. "Is this punishment?"

"No."

A pause stretched just long enough to feel deliberate.

"This is education."

The swarm dispersed as instantly as it had gathered, leaving the guard kneeling in the sudden, humiliating quiet, covered in nothing worse than his own embarrassment and the lingering memory of several hundred extremely judgmental flies.

"Also, yes," Beelzebub continued, entirely unbothered by the shift in tone. "You may have tomorrow off."

The guard looked up, cautiously hopeful. "...Really?"

"Yes."

A beat passed, just long enough for hope to settle in properly before being dismantled.

"To clean the throne room."

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