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To Kill a Spider

Summary:

Percy and Annabeth have the "best friends" routine down to a science. They share a friend group, an apartment hallway, and an endless list of unwritten rules for managing each other’s lives. It’s simple, comfortable, and completely platonic—or so they keep telling themselves.

But navigating their twenties means navigating everything else, too: busy schedules, timing that never quite aligns, and seeing each other try to move on with other people. It takes a few detours and a lot of quiet realizations to figure out what’s been sitting right in front of them all along.

A low-angst, high-banter story about two idiots who have been in each other's orbits forever, slowly realizing that maybe thirty feet across the hall is still a little too far apart.

Notes:

Hi guys! I’m back from my hiatus and ready to share something a bit lighter! After writing The Wolf and the Owl and The Curse of Neptune, I definitely needed a break from the dark, heavy angst. Those multi-layered plots were super rewarding, but tracking all those moving parts got pretty overwhelming even for me as the author!

This new fic is going to lean into the best-friends-to-lovers trope. I usually don't write this specific dynamic since Percy and Annabeth already have that build-up in canon, but a few months ago I came across a YouTube Short that changed my mind. It was a celebrity showing a classic tsundere moment: a guy friend gets dragged over at an ungodly hour just to kill a bug for a girl, complains the whole time about how tired he is, kills the bug anyway, and then immediately crashes on her couch. The second I saw it, I thought, “Oh my gosh, this HAS to be the opening scene of my next fic.”

A quick note on the setup: the prologue gives a short nostalgic glimpse of how they first met as kids, and then Chapter 1 jumps straight into the main story, picking up with them in their mid-twenties!

Chapter 1: Prologue

Chapter Text

Prologue

The twins were screaming again.

Annabeth Chase stood at the top of the stairs, homework folder clutched to her chest, and calculated the probability that Matthew and Bobby were either being murdered by their babysitter or simply refusing to eat their dinosaur-shaped chicken nuggets. Based on the pitch and frequency of the shrieking—somewhere between "fingernails on chalkboard" and "air raid siren"—she was leaning toward nugget-related warfare.

She checked her watch. 6:03 PM. The summer sky outside her bedroom window had turned that particular shade of violet that meant the streetlights would flicker on soon, casting long shadows across the cul-de-sac where she lived. The kind of evening that usually found her planted firmly in the living room, babysitter-approved and accounted for, because Frederick Chase had very specific rules about his twelve-year-old daughter wandering the neighborhood after dark.

But Frederick Chase was at a conference in Boston. And her stepmother was pulling a double shift at the hospital. And Mrs. O’Leary, the babysitter, was currently attempting to reason with two three-year-old boys who had discovered that mashed potatoes made excellent wall paint.

Annabeth looked at her science folder. Then at the window. Then back at the folder.

‘Summer Assignment: Environmental Stewardship,’ the rubric read. ‘Document yourself performing community service. Minimum two hours. Photographic evidence required.’

Summer break wasn't ending anytime soon, but Annabeth was the type of person who preferred getting her work done ahead of time rather than leaving it hanging over her head. Besides, something about the chaos downstairs made her feel like the walls were closing in. The twins' screaming, the smell of burning chicken, the way Mrs. O'Leary's voice had gone up an octave in the last ten minutes—it all gave her the perfect excuse to leave.

Annabeth made a decision.

She moved quietly, years of practice making her footsteps silent on the carpeted stairs. She grabbed her stepmother's windbreaker from the hook by the door—the yellow one with the reflective strips that made her look like a traffic cone—and her digital camera, the one her dad had bought her for her birthday. She stuffed three granola bars in her pocket. She laced her sneakers with precision.

In the kitchen, Mrs. O'Leary was on her hands and knees, trying to scrape mashed potato off the baseboards while Matthew climbed onto the counter and Bobby attempted to flush a rubber duck down the toilet.

"I'm going out," Annabeth said.

Mrs. O'Leary didn't look up. "Sweetie, it's almost dark—"

"Science project. Two hours. I'll be back before eight."

"—and your father said—Bobby, get down from there!—he said you need to—MATTHEW, DON'T TOUCH THAT STOVE—"

Annabeth slipped out the door.

The summer air hit her face like a warm, damp towel. The sky was bruising purple at the edges, but the streetlights hadn't kicked on yet. She walked quickly, camera bouncing against her hip, mentally mapping her route. Their neighborhood—West End Avenue, with its manicured lawns and recycling bins arranged at perfect angles—was notoriously spotless. She'd be lucky to find a gum wrapper, let alone enough litter to justify two hours of documentation.

She needed to go further.

Annabeth walked six blocks east, past the territory she knew, past the houses that looked like hers, until the streets narrowed and the streetlights grew farther apart. Here, the buildings were older, brick facades crumbling at the corners, trash cans overflowing with the detritus of city life. A bodega cat watched her from a windowsill, eyes glowing yellow in the twilight.

She got to work.

A crushed soda can near the storm drain. A plastic bag snagged on a fire hydrant. A newspaper plastered against a chain-link fence, headline bleached unreadable by sun and rain. She photographed each piece before picking it up, arranging her finds in a small pile near the corner of 84th and Amsterdam.

Crack.

The sound split the air like a whip, and Annabeth jumped, dropping a crumpled Doritos bag. The sky, she realized, had gone dark while she worked. Not twilight-dark. Storm-dark. Heavy clouds rolled overhead, charcoal-gray and pregnant with rain.

Another crack, closer this time. Lightning, dancing between the buildings.

"Great," she muttered, checking her watch. 7:47 PM. "Just great."

The first fat drops hit her nose, her forehead, her outstretched hands. Then the sky opened up.

Annabeth ran.

She ducked beneath the awning of a closed pawn shop, pressing herself against the metal grate of the door. Rain sheeted down the sidewalk, turning the gutter into a river. Lightning flashed again—closer, angrier—and thunder rolled overhead like a freight train passing through.

She was twelve years old, but she was not afraid of storms. Thunder was just acoustic shockwaves caused by rapid atmospheric heating, and lightning was simply electrostatic discharge. There was nothing to fear. However, standing in an open street during an active electrical storm was just asking to get struck by lightning, so waiting for optimal walking conditions was simply basic common sense.

Another flash. The streetlights flickered on, casting everything in sickly orange.

That was when she heard it.

A sound that wasn't thunder. Wasn't rain. Wasn't the city breathing.

A whimper.

Annabeth turned her head. Across the street, tucked between the pawn shop and a shuttered laundromat, was an alley. Narrow. Dark. The kind of place her father had warned her about since she was old enough to walk—‘never go into alleys, Annabeth, never talk to strangers, never—’

But the sound came again. Small. Animal. Hurting.

She took one step forward. Then another. The rain soaked her sneakers, her jeans, her stupid yellow windbreaker that wasn't waterproof at all. She crossed the street and peered into the shadows.

A dumpster. Green, rusted, lid propped open. And beside it, huddled against the brick wall, a figure.

A boy.

He was curled in on himself, knees drawn to chest, arms wrapped around his shins. Dark hair plastered to his forehead. A skateboard—black with red wheels—lay discarded beside him, half-submerged in a puddle. He was shivering, Annabeth realized. Shaking so hard his teeth were chattering, though the summer air was still warm despite the rain.

"Hey," she said.

The boy didn't look up.

Annabeth hesitated. She wasn't good with people. She knew this about herself. She was good with facts, with numbers, with the structural integrity of buildings and the precise angles of classical architecture. She was good at being alone. Other children were unpredictable, messy, emotional in ways she didn't understand.

But the boy was shaking.

She stepped into the alley. The smell hit her immediately—garbage and wet concrete and something else, something sharp and chemical. She picked her way around puddles until she stood directly in front of him.

"You're going to get sick," she said. It came out more accusatory than she'd intended. "Sitting in water like that."

Nothing. The boy kept his face pressed against his knees, shoulders hunched.

Lightning flashed. The boy flinched—actually flinched, his whole body jerking like he'd been struck.

Annabeth sighed. A long, put-upon sound that she'd learned from her stepmother. Then, carefully, she lowered herself to the ground. The wet concrete soaked through her jeans immediately, cold and unpleasant. She sat cross-legged, close enough that their knees almost touched, and stared straight ahead at the brick wall—partly because sitting in an alley with a strange kid was undeniably awkward, but mostly because she didn't want to make him feel trapped or scare him off by staring.

"I'm Annabeth," she said to the wall. "Annabeth Chase. I'm twelve. I live on West End Avenue, which is six blocks that way, but you probably don't care about that. I have two little brothers who are monsters. Not literal monsters. Just... regular ones. They're three. Twins. Right now they're probably destroying the kitchen while our babysitter has a nervous breakdown."

She paused. Waited.

The boy's shaking had slowed, she thought. Just a fraction.

"I have a science project," she continued. "I have to pick up litter. Document it. Very exciting stuff. I was doing that when the storm started. I probably have enough pictures now, but I was trying to be thorough. My dad says I'm too thorough. He says I need to learn when good enough is good enough, but I think that's stupid. If you're going to do something, you should do it right. Otherwise, what's the point?"

Thunder rolled. The boy's hands tightened on his knees, knuckles white.

"I like architecture," Annabeth said. "Buildings. Structures. I want to design things someday. Bridges, maybe. Or monuments. Something permanent. Something that lasts." She glanced sideways. The boy had lifted his head just slightly, enough that she could see one eye peeking out from behind his arm. "What do you want to be?"

Silence stretched between them, filled with the sound of rain and distant traffic. Then:

"...Dunno," the boy mumbled. His voice was rough from crying, but still high and slightly squeaky—the typical, pitchy voice of a boy who hadn't hit puberty yet. "Maybe... a skateboarder?"

"That's not a real job," Annabeth said automatically.

The boy's eye narrowed. "Is too."

"Professional skateboarders exist, but the odds of becoming one are statistically insignificant. You'd be better off learning a trade. Or going to college. Do you go to school?"

The boy didn't answer. But he lowered his arms. Just an inch.

Annabeth studied him. He was small—smaller than her, definitely. Skinny in a way that suggested missed meals rather than natural build. His hair was black and messy and currently sticking up in wet spikes. But his eyes...

When lightning flashed again, she saw them clearly. Green. Not just green. Sea-green, like the pictures of tropical water she'd seen in National Geographic. Like the glass vases her stepmother collected. Like something ancient and deep and otherworldly.

"Why are you in a dumpster alley?" Annabeth asked.

The boy looked away. "Skateboarding."

"Skateboarding in a thunderstorm?"

"Got caught."

"By the rain?"

He shrugged one shoulder. A non-answer. Annabeth recognized it because she used it herself, often. Deflection. Protection. The armor of children who'd learned that explanations were invitations for more questions.

But he was still shivering. And the storm wasn't letting up. If anything, it was getting worse—the wind had picked up, sending rain sideways beneath the inadequate awning, turning the alley into a waterfall.

"We should go," Annabeth said. "Before it gets worse. Do you live nearby?"

The boy shook his head.

"Do you have a phone?"

Another shake.

"Parents? Someone waiting for you?"

Silence.

Annabeth bit her lip. She thought of her father, of the rules, of the long list of things she wasn't supposed to do. Don't talk to strangers. Don't go into alleys. Don't be reckless, Annabeth, don't be impulsive, don't be—

Don't be your mother.

She stood up. Her jeans were soaked, heavy, clinging to her legs. The rain was coming down in sheets now, turning the world into a watercolor painting, all gray and silver and blurred edges. Lightning forked across the sky, and this time she counted—one Mississippi, two Mississippi—before the thunder answered.

The boy had flinched again at the sound, pressing himself harder against the brick, eyes squeezed shut.

Annabeth looked at him. At his too-thin wrists and his sea-green eyes and the way he held himself like he wasn't sure whether to trust her or not. She thought of her brothers, screaming in the kitchen. She thought of her science project, abandoned on the corner. She thought of the way her father always said she was too logical, too cold, too much like stone when she should be like water.

She stepped forward. Extended her hand.

It was a small hand, she knew. Pale, with bitten fingernails and ink stains on the fingers from drawing floor plans when she should have been paying attention in class. Not a particularly impressive hand. Not a particularly strong one.

But it was steady.

"Come on," Annabeth Chase said.

The boy looked up at her. Really looked, this time, past the wet hair and the yellow windbreaker and the bossy tone. He looked at her hand. Then at her face. Then at the storm raging behind her, lightning splitting the sky into jagged pieces.

"Where?" he asked.

Annabeth didn't know. She didn't know where he lived or where he was going or why he was in an alley, shaking like a leaf in a hurricane. She didn't know anything except that she was twelve years old and she was not afraid of storms, and this boy with the sea-green eyes was afraid of it, and that was enough.

It had to be enough.

"I'll protect you," she said.

The words hung in the air between them, braver than she felt, bigger than she was. A promise made by a child who didn't know the weight of promises yet. A vow spoken in a dumpster alley while thunder rolled overhead and the city held its breath.

The boy stared at her hand for a long moment. Then, slowly, he reached out.

His fingers were ice-cold, trembling, but his grip was surprisingly strong when he took her hand and let her pull him to his feet.

"Okay," he said.

And together, they stepped into the rain.

**~End of Prologue~**