"Friday Afternoon - Stiles' Bedroom - 13 Years Old

"I'm sorry," Stiles said to Chiron, stilling all his movement. "Did you just say my sister disappeared?"
The centaur winced, before clearing his throat, "Yes I did, Stiles. I apologize for telling you this way but it was the only way I could." In the background of the IM, Stiles noticed a picture of Annabeth and Percy. It didn't help the way his stomach clenched.
"Okay," Stiles said faintly. "It's okay." He broke the IM, absently realizing that he had cut off Chiron in the middle of talking.
His sister, his twin, his span style="font-style: italic;"literal better half/span was missing. And he was- what? Existing without reason? Spinning off his axis? It had only been around five minutes and Stiles already felt completely lost.
He rose to his feet, staring around his room. What did he do? Where did he go? How did he get to Annabeth?
His Dad would know.
"DAD!" He yelled, hoping he was home. He ran down the stairs, narrowly missing wiping out in the rug at the bottom. "Dad!"
There was no answer.
He peered out into their driveway, swearing when he realized that his Dad's cruiser was gone.
He could run to the station. No- he could do one better. He could call 911. Wait- Frederick. Tony. Shit. He had no idea what to do. Okay, Stilinski, he thought. Are you a child of Athena or not?
He stopped for a moment, breathing in and out. "Keep it together." He grit out, accidentally biting his tongue, causing it to bleed. The sharp pain helped clarify what he needed to do. He was going to call his Dad.
He moved to the phone, numbly letting muscle memory dial for him. The phone rang twice before he picked up.
"Stiles," He sighed, "Can this wai-"
"Annabeth's missing."
John breathed in sharply. "What."
"Annabeth's missing," Stiles said again. John tried to speak but Stiles just kept going. "Chiron IM'd me. She's been missing since Tuesday night." John hissed out a curse. It was nearing evening on Friday. "They have no idea where she is."
"Okay." John said, "And when they say missing they mean…?"
"A manticore kidnapped her."
"Stiles." John drew out. "I'll be home in five." The click of the receiver was deafening in Stiles' ear. They were after the 48-hour mark of her kidnapping. That was not good. All that Stiles could think about was that statistically if with 48 hours a trail isn't found, all the police would find was a body. Or nothing. Stiles was pretty sure that in this case, a body was worse.
Stiles' eyes moved to the number that was pinned to the fridge door. The paper was crinkled and the ink of the number was slightly faded. There was no name, but Stiles knew exactly who it was. Hands shaking, he dialed it.
The phone didn't even ring once before it was answered.
"John," Tony Stark's voice answered. "What's wrong?"
"This- this isn't John." Stiles croaked out.
"Who the hell is this then?" Tony's voice had gone cold and fierce. "Why did you call this number? How did you get this number?"
"It's Stiles," Stiles answered, wincing.
Tony paused. "Stiles?" His voice gentled, his confusion evident. "Stiles… why are you calling? You've never called before."
There were so many things Stiles wanted to say to that, things about how he had wanted to for years but was afraid of rejection, things about how he much looked up to Tony, how much he wanted to be like him. But none of those things were important in the face of the truth.
"Annabeth's missing."
"What?" Tony's voice was flat, completely dead.
Stiles sucked up all the courage he had left and blurted, "She got captured by a manticore and I'm so scared and I thought you might like to know because you're important to us and I hope we're important to you and-" Stiles looked up to John entering the kitchen. "I didn't know what to do."
"Oh, kid." John crossed the kitchen and swept him up into his arms. Stiles promptly burst into tears. He finagled the phone from Stiles, checking the caller ID. He sighed when he saw Tony's name but obligingly brought the phone up to his ear.
"Let me hear it."
Tony's voice was cold again, "I entrusted you with the care of my younger siblings, and now one of them is missing? How long have you fucking known, John? How long have you been keeping this bullshit from me?"
John pulled Stiles in even closer, "I just found out. Apparently, Chiron thought that the correct way to tell Stiles the news was to IM him out of the blue and offer absolutely no solutions."
"When?" Tony grit out.
"This afternoon," John answered calmly. "Stiles called me about 10 minutes ago, I was at work and I came home immediately." Tony huffed. "I understand that you're upset Tony, but I'm doing what I can with the limited resources I have." Stiles sniffled, gesturing at the phone. John arched an eyebrow but Stiles just gestured harder. "Your little brother wants to talk to you," John said to Tony as he conceded the phone.
Stiles paused in pulling the phone to his ear. He'd never thought of it like that. He was Tony's little brother. He had another sibling. They weren't alone. It was only the sound of Tony's voice that brought him out of his reverie.
"Tony, please don't be mad at me."
"I- what?" Tony said, completely baffled. "I'm not?"
Stiles sighed. "I'm probably going to go missing too."
"What?!" Tony and John's voices merged into one shout. Stiles rolled his eyes at John, ignoring the way he arched an eyebrow. "What do you mean you're going to go missing?"
"I have to." Stiles shrugged, completely at ease with the words. "I have to find her."
"But…" Tony spluttered, trying to come up with a way to talk Stiles out of it. "You don't have the right tools, you don't know where you're going, and that's only the beginning."
Stiles scowled at the ground. John closed his eyes before reaching for the phone. Stiles immediately gripped it tighter and gave John a look of pure betrayal. He sighed, "Speakerphone Stiles. I don't want to repeat whatever Tony is saying." He pulled the phone from his grasp and hit a few buttons. "You're on speakerphone Tony."
"Good!" Tony said agitatedly. "Tell Stiles he's forbidden to go after Annabeth."
"But Dad-" Stiles began, talking over Tony.
"-absolutely not, Jarvis has calculated the dangers of being over 78% and-"
"-I have to go, it's like a thread is still connecting us and her-"
"-You have to listen to Jarvis, he would know-"
"-I can't just sit around-"
"Both of you, stop talking!" John shouted. "We are going to get absolutely nowhere if we don't actually have a conversation. Now, Tony, I understand where you are coming from but-"
John was cut off by a knock on the door. He looked pointedly at Stiles. "Tell Scott that you can't hang out right now. Family emergency, okay?" Stiles groaned but nodded. "I mean it, Stiles, I know you want to tell Scott but today is not that day."
Stiles sloppily saluted, "Aye, aye, Captain," as he headed for the door.
John sighed. "He gets that attitude from watching you on TV."
"Really?" Tony said, clearly flattered. "I had no idea he even…" He trailed off.
John shifted awkwardly. Neither he nor Tony were all that open about their emotions. He opened his mouth to offer his opinion when Stiles called his name.
"Dad?" He called. "I think you might want to come out here. We… have a situation."

Thursday Night - Northern California

"I'm just saying, we have no plan!" Percy yelled at Zoë, ignoring the Huntresses threat of injury. "And no plan isn't good!"
"Whoa there, Kelp Head." Thalia said, glaring in Zoë's direction, "I don't think Zoë was actually saying anything that warranted this." Grover nodded hesitantly from beside Thalia.
Percy sighed, slumping over. "I know. Sorry Zoë," He offered. "I… Annabeth's important."
Zoë blinked at him once before relaxing her pose. "I suppose that that is an adequate reason, though if you ever raise your voice at me again, you'll regret it."
"Percy nodded. Grover hesitated before lowering himself down to Percy. "I know it sucks, but it's not like we have Annabeth's brain handy."
"Yeah," Thalia snorted, "Imagine if she had a twin? Man, that would be double trouble."
"A twin?" Percy repeated softly, before jumping to his feet. "A twin! Yes!" He screamed, scaring some birds out of the bushes around them. "A plan!"
Thalia and Zoë exchanged looks. "What are you talking about?"
"I'm talking about Annabeth's twin? Stiles?" Percy said, looking at them questioningly. "He lives in Cali, has a weird twin connection with her?"
"Grover and Thalia stared at him, "We have no idea what or who you're talking about?" Grover said, his voice squeaking at the end of his question.
Zoë, however, looked appalled, "You speak of twins born to Athena? The Hearth Twins?"
"The Hearth Twins?" Percy said, scrunching up his face. "I have no idea."
"Wait wait wait. Hold up. We're off topic." Grover interrupted. "Annabeth has a twin brother?"
"Well, yeah?" Percy said. "I thought you knew. I mean like they said that no one else knew but I assumed that Thalia knew…"
"Thalia is right here." Thalia intoned. "And no, I didn't know."
"Well, Chiron knows too?" Percy offered up sheepishly."
"Oh my Gods," Grover muttered. "You really are a seaweed brain."
"Another boy will slow us down," Zoë said. "And we do not have that time."
"Well," Percy said, flinching slightly, "We're actually really close? And we go through the town next to him to get to San Francisco?"
"Thalia grinned, "We have to go."
Zoë frowned at her before rolling her eyes, "I suppose you won't let this go until we get there."

"Aw," Thalia winked at her, "You know me so well."

"Yes!" Percy cheered. "Beacon Hills, here we come!"

"Friday Afternoon - Beacon Hills - Stilinski Front Porch/span

"Who are you?" John asked the strange group of people clustered on his porch. The phone in his hand was still connected to Tony, on the condition that Tony didn't bring undue attention to himself. If he so much as spoke, John was ending the call.
"Dad," Stiles hissed. "That's Percy Jackson."
"Oh." John straightened. "Annabeth has spoken at length about you."
"Percy swallowed hard. He seemed to be at a loss of words. Stiles wasn't surprised, having his Dad's full attention was alarming, especially because he was still in his Sheriff's uniform. The other's in Percy's group also seemed confused.
"Wait…" Stiles said, turning to stare at Percy. "How did you get here? How do you know where we live?"
"Oh, um, Annabeth told me?" Percy mumbled, brief panic slipping across his face. "Actually, Stiles…"
"Stiles held up a hand. "I know. Chiron IM'd me." The group behind him relaxed.
"A girl with black hair pushed her way to the front, "Well, Stiles, Percy told us that you have a weird connection with her. Think you can lead us to her?"
"Stiles grinned, a vicious slash of teeth shining in the setting sun. "Fuck yeah."
"Language," John sighed from beside him. "If you're going, the least you can do is camp here for the night."
"Actually sir," A boy with brown curly hair spoke up, "We really can't."
"John nodded. "Well, before you go, can you at least tell me your names? So I know exactly who my son is going off with?" Percy opened his mouth to speak but was interrupted by Tony's voice screaming from the phone. John shot a look at Stiles, before turning and heading back inside without a word.
"Stiles frowned at his back but turned and arched an eyebrow at Percy. "The only person I don't know is her." He pointed at the girl at the back of the group. "I know the other two."
"Yeah right," Thalia scoffed. "Like you know who I am."
"Sure I do." Stiles said condescendingly, "You're Thalia Grace, daughter of Zeus." He ignored her small flinch. "That's Grover Underwood, bearer of the Golden Fleece." He watched as the other girl came to the front. "I don't know who you are but I promise that I'll keep my distance from you, Huntress."
"Percy was gaping. "How in the Hades did you know that?"
"Stiles smirked, "I'm a son of Athena. You can't get much by me."
"You all believe him?" Zoë scoffed, "He already told you how he knew this."
"Stiles shot finger guns at her, "And we have a winner. What is your name after all?"
"It's Zoë Nightshade, Son of Athena."
"Well Zoë, I think you and I are going to get along great. And please," He added as an afterthought, "Call me Stiles."

Friday Afternoon - Beacon Hills - Stilinski Kitchen

"You cannot be seriously thinking about letting Stiles go off with a bunch of ruffians and thugs and seriously- like on a quest? Absolutely not, I fucking forbid it John. Do you hear me? It's forbidden. I can think of so many other things that he can do that wouldn't be nearly as dangerous but just as fun. Like scuba diving. That's it-"
"Tony."
"I'll totally offer him scuba lessons and then he won't go and he'll be safe and-"
"Tony."
"-What John? What could possibly be so important that you're interrupting?"
"He's going with or without my, or your, blessings."
"Tony was silent for a long moment. "There's nothing…?"
"John sighed. "It's Annabeth, Tony."
"I know, it's just, why?" They both were silent for a moment. "It was the first time I had ever heard his voice."
"John nodded, and rested his head against the cupboard. "I know Tony."
"What if we…loose them both?" Tony whispered. "I can't… I don't know what I'll do."
"John breathed out slowly, measuring his words. "There are bigger things at play here. We… We have to let them do this." Tony made a small sound. "I'm not done. I know it's hard. You think that every day the Stiles leaves this house, I'm not afraid?" He laughed harshly. "If I could keep the two of them, and you, safe, I would. But, unfortunately that's not how the world works."
"I hate this." Tony huffed out, trying to hide the tears. "I hate this."
"John scrubbed a hand over his face, "I'm not surprised. Welcome to being the oldest." He paused, taking a moment to control his emotions. "I have to go."
"Yeah." Tony mumbled. "I know. I'll talk to you later?"
"What?" John blurted out, surprised. "You don't want to say goodbye to Stiles?"
"Oh," Tony said, baffled. "I didn't know that was an option."
"John shook his head but ignored Tony for the most part. "Stiles, the phone's for you," he called, heading to the front of the house and holding the phone out. "C'mon now."
"Stiles grabbed the phone from John's hand and shot the rest of the group a grin. "Be back in a few!" He called cheerfully as he headed inside.
"So," John said, arching an eyebrow at the group. "You're some of Annabeth's friends."
"Yes." Percy said, staring at a point over John's shoulder. "Um, I mean, yes sir."
"John chuckled a grin stretching his face, "You don't need to call me sir young man." Percy began to smile back tentatively. John's smile dropped. "You can call me Sheriff Stilinski. Or Sheriff for short." He watched all of their faces pale considerably. "Now, why don't you all join me inside and fill me in on who you are and what you want with my son."

Upstairs, Stiles was fidgeting as he waited for Tony to respond.
"I don't like it," Tony said lowly. "You're in danger and I-" He cut himself off.
"I know." Stiles hesitated. "I just… I can't wait around. She's… I can't do this without her."
Tony was silent. It was clear to him how much it was tearing Stiles a part to not know that Annabeth was safe. That's not to say that he wasn't feel mixed up about it but… He just didn't have the same connection that they did.
"Alright." Tony said hoarsely, ignoring the twisting in his gut and the numbers Jarvis kept flashing at him. "I know you were going to go without my permission, but for what it's worth… I do give permission."
"Stiles blinked, fighting back tears. "It does matter." He sat down on his desk chair. "When we get back, can I call you?" He blurted out, crossing his fingers. Tony didn't reply for a long moment.
"Stiles sucked in a breath, panicking, "I didn't mean to overstep, I just thought that maybe you would like to hear from us and-"
"Of course you can call me," Tony said, clearing his throat. "That wasn't- that wasn't a rejection Stiles." He sighed. "I just wasn't expecting it."
"Wasn't expecting it?" Stiles echoed, frowning.
"That's not important now," Tony muttered under his breath. "Anyways yes, Stiles, please call me. In fact I'll send you some Stark cell phones so you can always connect to me."
"Stiles paused. "I'm not sure how my Dad is gonna take that."
"Tony snorted, "I think he might like the idea of a direct line to you."
"Oh yeah," Stiles grumbled. "I'm sure he'd like that."
"He just wants you safe," Tony admonished. "I can't even believe he agreed to let you go first."
"Stiles shrugged. "He just knows me." He sucked in a breath. "I want you to know me like that too, okay? I love you a lot and I want to know you too."
"Oh Stiles," Tony said quietly. "I love you too. I can't wait to get to know you and-" Behind Tony's voice there was a massive crash. "Fuck, the was the stabilizing agent breaking down." He swallowed hard. "I've got to go Stiles. I love you and I know that you'll bring Annabeth back for us. Call me when you're done."
Stiles was barely able to reply, "Love you too," before he realized he was speaking to the dial tone. He wasn't quite ready to go downstairs, his mind whirling after the conversation he had just had with his older brother. He couldn't believe it. Tony wanted to know him.
" span style="font-style: italic;"Tony wanted to know him. /span
"And that made all the difference in the world.

"Percy was pretty good at answering all the questions that his Dad was flinging at him, Stiles acknowledged as he neatly jumped over the rug at the bottom of the stairs.
"Well, Sheriff Stilinski, she's saved me more than I can count and-"
"Dad." Stiles interrupted, watching Percy slump into the couch out of the corner of his eye. "All set." He tossed the phone to his Dad, turning to smile at the rest of the group. "So, where to?"
"Thalia sighed. "That's the thing, we have an idea, but we're gonna need your help in narrowing it down."
"Sure," Stiles agreed easily. "What's the idea?"
"Mount Tamalpais," Zoë said, her eyes narrowed.
"Oh shit-"
"Language."
"Really?" Stiles finished. "That would be the old Mount Othrys is, right?"
"Yes." Zoë said, outright glaring at him now. "And how would you know that?" She shifted out of the way as John left the room.
"Well," Stiles said slowly, glancing at his Dad's retreating back. "It was mainly a guess because I don't know, it seemed logical. Also geography. The entrance to the Underworld is in LA right? It just seemed like that would fit."
"That was not an answer." Zoë replied. "I will keep my eye on you."
"Sounds great." Stiles said flippantly, ignoring Percy's wide eyes and Grover shaking his head. "Can't wait."
"Thalia laughed, "Man, Annabeth wasn't kidding when she said she had experience dealing with sarcasm."
"It's my favorite thing." Stiles said brightly. "Now, we're leaving soon, right?"
"Yeah," Grover answered. "Right now, if that's okay."
"Sure," Stiles agreed easily. "Let me grab a couple things." He turned and headed out, yelling for his Dad as he went.
"Well," Thalia said. "That could've gone way worse."
Zoë arched an eyebrow. "Did it not go badly?"
"Well yes, kind of." Grover said. "But it could have gone so much worse." They all were silent for a moment, listening to the low murmur of voices from the floor above.
"Percy groaned suddenly, "Annabeth is gonna kill me." At the looks he got, he elaborated. "If Stiles so much as gets a speck of dirt on him, I'm going to die."
"Thalia snorted, "And you're only just thinking of this now Kelp Head?"
"Alright," Stiles said, bouncing into the room. "We're good to go now." He had a backpack with him and had changed his shirts, layering them in a different way.
"Seriously?" Percy breathed.
"What?" Stiles said, looking offended. "I brought my camping gear and snacks."
"No, it's not that." Percy said. "It's just- your Dad?"
"My Dad?" Stiles said, arching an eyebrow. "He's fine with this and I already said goodbye."
"Good." Zoë said. "Then let's begin."

Friday Afternoon - Leaving JFK Airport - Stark Private Jet

"Sir, you have an incoming call."
"Go for Tony."
"Tony." John's weary voice came over the speaker. "He just left." Tony's mouth clicked shut. He glanced around the interior of the jet, taking in nothing. John continued. "He left with a backpack." He paused, before continuing. "I put a tracker in it."
"What?" Tony's snapped. "You put a tracker on him?"
"On his backpack, yes. I can send you the info and link to tracking it."
"Tony paused from where he had already begun hacking John's laptop. "Yes," He cleared his throat. "That would be nice."
"He knows about it too so don't worry."
"And he doesn't…"
"Mind?" John finished for him. "No. He knows how much this is costing you and I and he was very open to it."
"Tony hummed in response. He had opened the link that John had sent him and was watching the red dot as it moved through California.
"I'll be in L.A. tonight." He said. "I know you and Pepper are in… agreement about this not being the right time. But if something happens, I want to be close."
"Sure thing," John agreed easily. "Personally I'm more comfortable now that I know you're closer as well. Though if this goes well, you know you can't come and hand them the phones, right?"
"Tony scoffed. "Of course I know. I'm not going to waltz into Beacon Hills and disrupt it. I'll just send you a discrete overnight package that has new tech for all of you." He paused. "That will include you John."
"Tony," John hesitated, "You know that if I could have you hear every single day I would. And that I'm not trying to take your, or Gods forbid, Howard's place."
"I know." Tony said quietly. "You're in this family. It's-" He cut himself off.
"John waited for him to finish and when no words were forthcoming he sighed. "I know Tony. Call me when you land?"
"Sure." Tony said. "I've got to go. Wheels up and all that. Bye." He hung up, not waiting for a reply. "Jarvis, do not let that tracker go."
"For you sir, always."
"Tony nodded once. "Initiate Protocol Alpha-Helsinki, Base One. I'll program two- no wait three numbers," He corrected himself. "To Base One as soon I get my hands on the phones."
"If I may Sir?" Tony waved a hand in the direction of the laptop. "Private storage of all information?"
"Of course J. This is for our eyes, and Peppers only. No Stane."
"Yes Sir." Jarvis replied before falling silent. Tony closed his eyes, the familiar whine of the engine luring him to sleep. Before he slipped into unconsciousness, his last thought was of the safety of the twins, completely oblivious to his own danger and the issues he would soon face.

Friday Afternoon - Mount Olympus - Narrow Alley

"It is not often that you seek me out."
"It is not often that I have need for you."
"Ouch," he hissed, ignoring her rolling eyes.
"This is not the time for games!" She admonished. "The two are growing older. We know-"
He raised a hand. "We know nothing."
"Well," She said, "She is getting stronger. And if she's rising then we know that they must be it."
"We know nothing." He cautioned again. "All we know is who we have thrown our lot with."
"But-"
"There are no guarantees." He shook his head. "If this prophecy, the one with the Eldest, comes to pass as we assume it will then odds are against-"
"Hey!" Someone yelled close by. A flurry of small feet sounded against the cobblestone.
The two exchanged looks. "This is not the time." She said, turning to go.
"Of course." He said, moving out of her way. "Another time?"
She snorted, "In your dreams." He grinned at her response, before turning onto a bright Olympian street. They would meet later, he knew, and they would plan. After all, it wouldn't do to only have one way to bring about the destruction of Olympus. For that, one needed multiple ideas.
He winked at a nymph, grinning when she blushed, before he vanished from the street.

Friday Evening - The Base of Mount Tamalpais

"We're here." Thalia said, looking up the slope. "Your turn Stiles."
"What?" Stiles said, panting slightly. "My turn?"
"Yeah." Percy said, shielding his eyes against the glow of the sunset. "We need your twin sense to lead us to Annabeth."
Zoë frowned. "We will need to tread carefully. My sisters awaken in dusk."
"Right." Stiles nodded, closing his eyes briefly. He snapped them open. "This way." He turned and began heading up a path that seemed to just appear in the soft twilight.
Grover shuddered. "That was freaky."
Zoë arched an eyebrow. "I thought that Satyrs enjoyed nature magic."
"We do," Grover admitted. "That wasn't like any nature magic I've seen before."
"Well," Thalia called over her should as she strode up the hill, "At least we have a plan and are going somewhere."
"True," Percy acknowledged.
Ahead of them, Stiles was moving quickly. He could sense that Annabeth was near. It was like an uncomfortable prickling at the base of his neck that was subsiding as he moved closer to her. The feel of it relaxing though wasn't enough for him. He needed to get to Annabeth now. He just knew that other things were in the works.