Chapter Text
The house on Wisteria Walk smelled of boiled cabbage and the heavy, dusty scent of too many cats. Harry sat on the edge of a floral-patterned sofa that felt slightly damp, his legs dangling several inches above the rug. Mrs. Figg was in the kitchen, the clatter of a plate echoing against the linoleum. Usually, Harry spent these days looking at blurry photographs of Mr. Tibbles, Snowy, Mr. Paws, and Tufty until his eyes hurt, but today felt different.
Mrs. Figg walked into the small living room carrying a plate with a thick wedge of chocolate cake. It looked very old, the frosting cracking like dry mud, but she set it down in front of him with a look that wasn't stern at all. She didn't even tell him to keep his crumbs off the upholstery.
"There you are, Harry," she said, her voice softer than the scratchy tone she used when Dudley was around. "A bit of a treat while the others are away at the doctor's."
Harry looked at the cake, then back at his left arm. He had been tugging at the cuff of his oversized sweater for an hour. He didn't want to eat. He was too worried about the smudge.
"Mrs. Figg?" Harry whispered. He looked up at her through his round, taped glasses. "Am I broken?"
Mrs. Figg paused, her hand resting on the back of a chair. "Whatever do you mean, dear?"
Harry pulled his sleeve up past his elbow. Yesterday, the spot on his arm had been a grey, blurry nothing that looked like a dirty thumbprint. But when he woke up this morning, it had changed. It was bright. It looked like a tiny, round machine made of circles and little teeth, but it was filled with colors that shouldn't be on a person's skin. Saturated reds and oranges bloomed on one side, shifting into a bright, electric blue. In the very middle, a tiny triangle glowed like a little blue light bulb.
"It got colored in," Harry said, his lip wobbling. "I tried to wash it, but it stayed. Is it... is it cancer? Am I going to die?"
Mrs. Figg sat down on the sofa next to him, the springs groaning under her weight. She didn't look scared. She didn't look like she was going to scream about freaks the way Aunt Petunia did. She took his small hand in hers and looked at the mark with a very strange, sad smile.
"Oh, Harry. No, it isn't a sickness," she said. She reached out and patted the messy black hair on his head. "It’s a soulmark. It means you have a soulmate."
Harry blinked, looking from his arm to her face. "A soulmate?"
"It’s a very special friend," Mrs. Figg explained, nodding slowly. "Most people are born with a little grey picture, but it stays quiet for a long time. It only turns bright like this when the other person—the one who is your soulmate—turns fifteen years old."
Harry traced a finger over the red pigment that bled softly past the black lines. "Fifteen? That’s really big. I’m only four."
"They are very grown-up, aren't they?" she agreed. "Somewhere out there, your special friend is having a fifteenth birthday today. That’s why your arm is so pretty now. They are growing up."
"Will I see them?" Harry asked.
"Someday," Mrs. Figg said. "And when you turn fifteen, too, you’ll be able to talk to them. You can take a pen and write a little note on your skin, and the words will show up on their arm, right where their mark is. And they can write back to you. It’s like having a secret letter that no one can ever take away."
Harry looked back at the glowing blue triangle in the center of the circles. The Dursleys always took his things. They took his toys if Dudley wanted them, and they took his space, and they took his snacks. But he looked at the bright colors and felt a tiny spark of something warm in his chest.
"A secret letter," Harry repeated. He picked up a fork and took a very small, crumbly bite of the dry chocolate cake. It tasted like sawdust and sugar, but for the first time all day, he didn't feel like he was going to be sick. "They're fifteen today."
"That's right," Mrs. Figg said, reaching for a photo of Tufty to show him. "They are waiting for you to grow up, Harry. You just have to be patient."
The MIT library smelled like old paper and the desperate, late-night sweat of students who were much older than fifteen. Tony sat at a back table, his chair tilted on two legs, staring at the inside of his left elbow.
It was May 29, 1985. He was officially fifteen. He was also officially alone.
The telephone in his dorm hadn’t rung. No telegrams had arrived from the Stark household, and certainly no cards with Howard’s stiff, hurried signature. Even the robotics lab was off-limits; James had physically escorted him out and locked the door three hours ago, citing something about “mental health” and “not spending your milestone birthday inhaling solder fumes.”
So, Tony was in the library, surrounded by medical journals and esoteric sociopolitical texts. He had spent the morning nursing a faint, embarrassing hope that the mark on his arm would suddenly bloom into color, signaling that his soulmate had hit fifteen at the exact same moment he had.
The mark remained a stubborn, ghostlike grey. It was a triangle, a vertical line, and a curved arc, all bisected by a sharp, jagged bolt. It looked like a logo for a physics cult he hadn’t been invited to join.
A shadow fell over the table. Tony didn’t look up. He knew the gait; it was heavy, rhythmic, and annoyingly disciplined.
“Robotics is still a no-go zone, Stark,” James said, pulling out the chair opposite him. “You haven’t eaten since ten a.m. Let’s go.”
Tony didn’t move his arm. He kept his eyes on the grey lightning bolt. “I’m doing research. Theoretical biology. Very prestigious.”
James leaned forward, squinting at the pile of books. “Soulmate communication protocols? Seriously? I thought you called this ‘superstitious ink-staining.’”
“I was twelve then. I’ve matured. Now I call it an inefficient biological hardware-software interface,” Tony muttered. He finally let his chair drop forward with a sharp thud.
“So, let me have it."
"You want the briefing? I’ve been digging."
James crossed his arms, looking resigned. “Fine. Give me the abstract. What have you found out that the rest of the world hasn't figured out in the last thousand years?”
“First off, the ‘destiny’ marketing is garbage,” Tony said, tapping a finger on a diagram of a skin graft. “The mark identifies a person of profound potential significance, but the relationship itself isn't predetermined. It doesn't mandate a romantic partner. It's just a connection. I could spend the rest of my life arguing with this person about cold fusion, and that would satisfy the bond’s requirements.”
“A very special friend,” James suggested dryly.
“Don’t use the Hallmark version; it’s insulting. It’s a conduit,” Tony corrected. He traced the vertical line in the triangle. “But here’s the kicker: I can’t talk to them. I’m fifteen; my side of the bridge is built, but written communication is dormant until both people are fifteen. Which means my mystery partner is currently younger than me.”
James raised an eyebrow. “How much younger?”
“That’s the problem. The age gap is unknowable,” Tony said, his voice sharpening with irritation. “They could turn fifteen tomorrow. They could turn fifteen in 1995. I could be thirty before I even get a 'hello.' It’s a complete black box.”
He turned his arm, showing James the grey lines. “The image represents the other person. Always. They are out there with some version of me on their arm, and I’m stuck with this. It’s some kind of geometric-mechanical hybrid. I’ve spent two hours trying to find this specific triangle in historical archives. Nothing.”
“Maybe it’s not historical,” James said. “Maybe they haven't invented it yet.”
“And the transmission isn't accidental. It’s intentional. Random ink, bruises, spilling coffee on yourself—none of it is transmitted. You don't have to write on the mark. Anywhere on the body works, and it appears in the same place on them. Honestly, the security implications are fascinating. You can’t wiretap a soul, James. It’s the only truly private communication channel left in the modern world.”
“Which is why people wear sleeves,” James noted, glancing at Tony’s exposed arm.
“Yeah, well, I’m not worried about privacy if there’s nothing to see,” Tony snapped. He went quiet for a second, his thumb hovering over the grey ink. “There’s a severance response, too. If the other person dies, the mark fades and loses color. A Severance Event. It’s basically a biological 'Connection Terminated' message. So as long as this stays grey and doesn't fade into nothing, they’re still breathing. Somewhere.”
James watched him for a long moment. He didn't offer any of the platitudes Howard might have—the ones about duty or legacy. He didn't mention the fact that Tony's parents hadn't called. He just reached out and shut the book Tony was staring at.
“You’re never going to figure out the meaning of that symbol in a library, Tony,” James said firmly. “You’re trying to solve a puzzle where half the pieces haven't been manufactured yet. Give it a rest. It’s your birthday. We’re going to that burger place off-campus, and you’re going to tell me why my flight-control calculations are wrong.”
Tony looked at the closed book, then at the man sitting across from him. James was the only person who had bothered to lock him out of a lab for his own good. He was the only one who had showed up.
“You’re really persistent, you know that, Rhodes?” Tony said, standing up and pulling his sleeve down.
“It’s a job requirement for being your friend,” James replied, heading toward the library exit.
“‘Rhodes’ is too formal,” Tony decided, catching up to him in a few quick strides. “It’s clunky. Doesn’t roll off the tongue. From now on, you’re Rhodey.”
James stopped at the door, looking at him with an expression of profound disbelief. “Rhodey? Absolutely not.”
“Too late. It’s already in the system,” Tony said, flashing a grin that was almost genuine. “Come on, Rhodey. I’m fifteen. I’m a man of profound potential significance. Buy me a burger.”