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Crimson Inheritance

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i am thinking of an undertale mafiafell au maybe but there are 4 families competing and you are in the rival one from the serif(gaster, sans, papyrus) brothers and the mc is young and his brothers are into the business from your father (that passed) but they never told you. not because they don't trust but maybe because tehy keep trying you like a hcild nd coddle and you don't know theur true business and just think they do something legit (idk what but something make something up taht makes esne and sounds legit) and the main reason could be cause you look like father a lot and they don't wanna lose anyone else maybe (the mc has dark-red/ginger hair and frekles exactly like dad, the only one of the brothers to have it and when they see him they see dad(the semblence could be uncanny like even the face structure maye could be similar), only the eye color could be differnet like you have grey eyes and dad had hazel like your brothers that have hazel eyes or maybe some green but all either have dark-brown to black hair resembling mom more)idk i find it fascinating the brothers coddling him maye or just not telling but still being brothers and maybe tease him sometimes or be little shits idk caus they're all older than him like the mc is the youngest and the next pair of brothers are twins that are 2 yours older than the next one 2 years older than them and the next one could be 3 years older than that one.

Chapter 1: The Serpent's Alley and the Stolen Signet

The rain in Black Market Alley wasn’t water; it was a greasy drizzle that made the neon signs bleed color onto the cobblestones. Caspian Ainsworth—Cas to everyone who mattered—ducked under a rusted awning, his laughter echoing too brightly for the shadowed street.

“You’re lost, mate,” Liam said, shoving his hands deep into his jacket pockets. “My cousin said the new synth-dealer was on Hemlock. This is… not Hemlock.”

“It’s an adventure,” Cas said, his grin unwavering. He pushed a hand through his hair, the dark red strands damp and sticking to his forehead. The flickering sign from a nearby booth painted his freckles in alternating washes of cyan and poison-green. “Since when are you scared of a little atmosphere?”

“Since the atmosphere started smelling like wet garbage and bad decisions,” Mia muttered, but she was smiling too, her eyes wide as she took in the labyrinth of narrow passages and whispered transactions.

Cas led them deeper, the hum of generators and the low murmur of deals thrumming in the air. He felt a familiar itch under his skin—the same one that crawled up his spine during yet another tedious family dinner where his brothers spoke in half-finished sentences about “logistics” and “territorial agreements.” He was twenty-two, not a child. But try telling that to Silas and Ronan, with their identical, patronizing smiles. Stay out of the west quarter, Cas. Don’t ask about the ledgers, Cas. It’s complicated, you wouldn’t understand. He understood being treated like the family idiot, that was for sure.

A sharp crack, muffled by walls and rain, made them all flinch. Gunshot, maybe. Or a slammed door. The friends exchanged a glance, the thrill curdling slightly.

“Okay, maybe we head back,” Liam said.

But a low, pained snarl cut through the next alley over. It was an animal sound, raw and guttural. Without thinking, Cas peeled away from the group, drawn toward the noise.

“Cas, don’t—” Mia hissed.

He was already rounding the corner. In a dead-end cloaked in deep shadow, a large, hulking figure was pinning a smaller, wiry one against the wet brick. The aggressor was a monster—a Brute, by the look of the serrated ridges along his forearms. The one being pinned was sleek, fur matted with something dark, hissing through needle-like teeth.

“Hey!” Cas called out, the word leaving his mouth before sense could catch up.

The Brute monster turned, his eyes like chips of yellow glass. “Piss off, human. This is Serif business.”

Serif. The name meant nothing to Cas, just another gang in a city full of them. But the smaller monster was bleeding from a gash on its temple, its breaths coming in ragged hitches. It looked… scared.

“He’s hurt,” Cas said, stepping forward. His heart hammered against his ribs. “Just let him go.”

The Brute laughed, a sound like grinding stones. “Or what, ginger? You’ll write me a strongly worded complaint?” He shifted, and the chain around the smaller monster’s neck caught the distant light. It wasn’t a chain. It was a leash.

Something hot and furious boiled up in Cas’s chest. He took another step. “I said let him go.”

In his fervor, he leaned in, reaching a hand out as if to help the injured creature. The silver signet ring he wore on a chain around his neck—too large for any of his fingers, a keepsake he’d found in his father’s old effects—slipped from beneath his shirt and swung into the dim light.

The effect was instantaneous.

The smaller monster, who had been struggling weakly, went utterly still. Its slit-pupiled eyes locked onto the ring. It wasn’t looking at Cas. It was staring at the heavy, worn silver, the stylized ‘A’ etched deep into its face.

The Brute noticed the shift. He followed the monster’s gaze. His yellow eyes widened, then narrowed to vicious slits.

A low, trembling whisper came from the injured monster, directed at Cas. “You have no idea what you’re wearing. No idea what that symbol means, walking in here displaying it like a trophy.”

The fear in its voice was gone, replaced by a kind of horrified awe. Cas’s hand instinctively closed around the ring, his father’s ring. The familiar weight of it usually brought comfort. Now, it felt strangely warm.

That tone—the implication he was a thief, a poser—lit the fuse of his constant, simmering frustration. His grey eyes, so unlike his brothers’ blues and greens, flashed.

“Yeah?” Cas snapped, his voice losing all its earlier uncertainty. He pulled the chain off over his head, holding the ring up defiantly. The rain slicked his ginger hair back, highlighting the sharp, familiar line of his jaw. “It was my father’s. So I think I know exactly what it means.”

For a heartbeat, there was silence. The very air seemed to freeze.

Then the smaller monster let out a choked gasp. The Brute’s face underwent a grotesque transformation from cruelty to stark, calculating shock. He looked from the ring, to Cas’s face—really looked, at the hair, the freckles, the defiant set of his shoulders—and back to the ring.

“Ainsworth,” the Brute breathed. The word was a curse and a revelation.

“Cas, run!” Mia’s scream shattered the moment from the alley mouth.

But it was too late. Shadows detached from the walls. Two more figures, larger, moving with a brutal, disciplined grace, blocked the exit behind his friends. He heard Liam shouting, the scuffle of feet, and then his friends’ screams fading as they were shoved back, fleeing for their lives.

The Brute was still staring at him. “The old wolf’s pup,” he murmured, a nasty smile spreading. “And they kept you away from us.”

Rough hands grabbed Cas from behind, wrenching his arms back. The ring was torn from his grip, the chain snapping. He fought, throwing an elbow that connected with something solid, earning a grunt and a tighter hold.

“Let me go!”

A cloth, reeking of chemicals, was clamped over his mouth and nose. The world, all the bleeding neon and oily rain, tunneled into a single, dark point. The last thing he saw was the Brute holding his father’s ring up to the light, studying it like a priceless relic, before slipping it into his own pocket.

Consciousness returned in jolts and starts. The smell of old leather, cigars, and antiseptic. The groan of a moving vehicle. His head pounded.

He was in the back of a windowless van, his wrists bound with a plastic zip-tie. Across from him sat the Brute, watching him with those unblinking yellow eyes.

The van stopped. The doors opened to a loading bay, clean and brightly lit, starkly industrial. The Brute hauled him out, not roughly but with immense, undeniable force. Cas stumbled, his shoes squeaking on the polished concrete.

They marched him through sterile corridors. This wasn’t some dank basement. This was the heart of something organized, powerful. Fear finally began to crystallize in his gut, cold and sharp, but he shoved it down. He wouldn’t give them the satisfaction.

They entered a spacious office. One wall was all glass, overlooking the rain-smeared city skyline. A massive desk of dark wood dominated the room. And behind it stood a monster unlike any Cas had seen.

He was tall, elegantly built, without skin, only bones the color of weathered ash accompanied by a menacing, but intelligent face intelligent face. His eyes were the true shock—a luminous, calm purple. This was no back-alley enforcer. This was authority.

The Brute shoved Cas forward. “Found something sniffing around the Alley, Mr. Gaster. I think you will find quite..intriguing” He placed the signet ring on the desk with a soft, definitive clink.

The monster—Gaster—didn’t look at the ring. He looked at Cas. His amber gaze traveled slowly from Cas’s disheveled ginger hair, over the scatter of freckles across his nose, down to the stubborn, angry set of his mouth.

Cas stared back, his heart a drum solo in his ears. He straightened his spine, meeting that piercing stare with every ounce of defiance he could muster. He refused to show his fear.

Gaster’s expression was unreadable. For a long moment, he simply studied him.

Then, something shifted. A flicker in the calm purple depths. His eyes dropped briefly to the ring, then snapped back to Cas’s face, to his grey eyes, narrowed in challenge.

Gaster’s breath caught, almost imperceptibly. His body, for a fraction of a second, recoiled. It wasn’t fear. It was pure, unadulterated recognition—the shock of seeing a ghost in the flesh. He took a single, unconscious step back, the leather of his chair creaking.

The moment passed. Gaster’s composure slammed back into place, colder than before. He leaned forward, placing his palms flat on the desk, his gaze dissecting.

“The eyes are not quite right.” Gaster said quietly, as if to himself. The words weren’t for Cas. They were an adjustment, a correction to a startling first impression. A faint, intrigued smile touched his lips, devoid of any warmth. “But the fire… that is familiar. Welcome, Ainsworth. It's a pleasure to finally meet you.” Gaster’s voice was smooth, like polished steel, but something in the way his fingers curled around the edge of the desk betrayed tension. “Though I must admit, I expected you to come to me under… different circumstances.”

Cas’s mind raced, but he kept his face carefully blank. He didn’t understand what was happening, but he knew enough to recognize danger when it was staring him down. “I don’t know what you’re talking about,” he said, his voice steadier than he felt. “I’m just here by accident.”

Gaster chuckled, a low, dark sound that sent a shiver down Cas’s spine. “Accidents, in my experience, are rare.

The silence in the office was absolute, broken only by the distant sigh of the rain against the glass. Gaster’s purple gaze held Cas’s, unblinking. The kind of stare that made you want to check your own skin for flaws.

“I don’t know what you’re talking about,” Cas repeated, his voice tighter this time. He tugged against the zip-tie, the plastic digging into his wrist. “My friends and I took a wrong turn. That’s it.”

“A wrong turn,” Gaster echoed. He picked up the signet ring, rolling it between his thumb and forefinger. The silver caught the cool office light. “Into my territory. While wearing this. With that face.” He leaned back, the chair giving a soft creak. “The math, as they say, does not compute.”

Cas’s mind raced, a frantic scramble against a wall of things he didn’t understand. Territory. His face. The way the Brute had said ‘Ainsworth’ like it was a loaded gun.

“It’s my father’s ring,” Cas insisted, the family line he’d always used. “He’s dead. What's in it to you?!”

“Oh, I know he’s dead.” Gaster’s tone was conversational, but the words were ice. “Everyone in this room knows that. The question that has always fascinated me is… what happened to the rest of him?”

The rest of him? Cas blinked. “What?”

“The legacy. The operation. The… family business.” Gaster placed the ring down again, precisely in the center of a leather blotter. “Your brothers run it now, do they not? Silas and Ronan. Efficient men. Cautious. They’ve kept the shelves well-stocked, I’ll give them that. But they lack their father’s… flair. His appetite.”

Import/export. Logistics. Territorial agreements. The words from a hundred dinners spun in Cas’s head, suddenly aligning with the neon-drenched alley, the leash, the Brute’s knowing smile. A cold comprehension began to drip, slow and sickening, into his gut.

“You’re talking about Ainsworth Consulting,” Cas said, but the statement sounded hollow, even to him.

Gaster actually smiled. It was a thin, bone-deep stretch of his jaw. “A delightful euphemism. We use one too. Serif Holdings. It sounds so legitimate on the tax forms.” He stood, slowly, moving around the desk with a predatory grace. He stopped a few feet away, just outside of Cas’s reach. “Suspected us much. Your brothers have done a remarkable job with you. The shielding. The civilian life. Don't tell me, you even go to school like nothing's happening, am I right?”

The patronizing tone was a match to the dry tinder of Cas’s pride. “What’s it to you?”

“It’s a curiosity. A strategic anomaly.” Gaster’s eyes flickered over him again, that same disconcerting assessment. “The spitting image of Elias Ainsworth in his prime, down to the stubborn set of the jaw, kept as a house pet. Were you not… interested in the family trade?”

“The trade is imports and exports,” Cas fired back, the defensiveness sharp in his voice. “And I’m not a pet.”

“Aren’t you?” Gaster tilted his head. “You were led to believe a fairy tale. Sent out into the world without the slightest idea of what your name truly means on these streets. That is the definition of a pampered, protected creature.” He took a step closer. The air grew colder. “The ring, brat. Where did you get it?”

“I told you. My father-”

“Which brother gave it to you?”

“Neither. I found it. In an old box in the attic.” The memory was clear: a dusty trunk, filled with his father’s old ledgers and faded maps. The ring had been at the bottom, wrapped in a scrap of velvet. He’d taken it as a tangible piece of a man he barely remembered. Silas had been furious when he’d seen it, had demanded he put it back. Cas had refused. It was the first time he’d won an argument with them.

Gaster’s luminous eyes seemed to brighten. “You found it. And you wore it out tonight, into my territory.” A low, genuine chuckle escaped him. It was the most frightening sound Cas had heard yet. “The irony is almost poetic. Your brothers spent a fortune and countless hours building a wall between you and the the real world. And you, oblivious, pick up the one key that unlocks every door and walk it right to my doorstep.”

He turned to the Brute, who had been standing statue-still by the door. “Rough him up. Not the face. Just enough to sell it.”

Panic lanced through Cas. He threw his weight backward, but the Brute’s hands were like vise grips on his shoulders.

“Sell what? What are you doing?”

Gaster didn’t look at him. He was looking out at the rainy skyline, his hands clasped behind his back. “A message needs a messenger. And a message needs to be credible. If I simply call your brothers and say I have you, they will panic, they will mobilize, they will prepare for war. It’s messy. But if you are found… distressed… in neutral territory, having clearly been in a scuffle with, say, a rival outfit from the South Quarter, then their reaction will be different. Protective. Emotional. Perhaps even… careless.”

The Brute yanked Cas around, pulling him toward the door.

“They’ll know it was you!” Cas shouted, struggling.

Gaster finally glanced back. The calm in his expression was absolute. “No. They will see what I need them to see. They will follow the breadcrumbs I leave. They will be so focused on the manufactured threat from the south that they won’t notice my people moving in the west. And you…” He gave Cas that thin, bone-deep smile again. “You will have had a terrifying adventure. One that might just make you start asking your brothers the right questions. I’m doing you a favor, brat. Consider this your real education.”

The door opened. The sterile hallway outside looked like a tunnel. Cas dug his heels in, his mind screaming. This was a game. A game with rules he’d never been taught, and he was the piece being moved across the board.

“My brothers will rip you apart,” Cas snarled, the promise raw and real in his throat.

Gaster’s voice followed him out, cool and certain. “I’m counting on them to try.”

The door began to swing shut, cutting off the view of the office, the skyline, the monster in the sharp suit. The last thing Cas saw was Gaster lifting his father’s ring, studying it once more before slipping it into the pocket of his own waistcoat.

Then the Brute’s fist connected with his stomach, and the world dissolved into a gasp of pain and the smell of wet concrete and diesel fuel.

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