Third Person POV:

Another, but older looking, Percy and a younger girl looking about twelve. "Where are we" The older Percy asked. 

"A different Universe's Mount Olympus" Zeus answered, already hating the new Percy for some reason.

"Dad Can..."The younger girl started to ask

"No, you can't, Zoe. I fear things happened differently here, and there might be some slight altercations to the rules of this Universe" Old Percy said, and the young girl seemed upset, though only those who guessed who her mother was knew why. "A few questions, what have you read, so far? Does this Universe me have a mortal Uncle that lives in London, and does the name Kenway mean anything to anybody here" the older Percy asked

"We only read the prologue, which was you meeting with whom I presume is her mother" Athena stated pointing to Zoe, "You don't have any living mortal family besides your  mother, step-father and new baby sister Estella. And Kenway is believed to be the last name of a character in an upcoming release adding to a popular video game series titled Assassin's creed" she finished and got a few chuckles from the older Percy and his daughter.

"That's funny, anyway whoever is reading continue I'm quite interested now" Old Percy said

(AN: The other Universe's Percy is going to go by Perseus now)

The Next morning he had the worst headache he'd ever had.

"That's the understatement of all time, I would rather be Zeus with Athena stuck in my head" Perseus stated, which grew a few chuckles from Apollo and Hermes

"I'm never dinking again," Percy moaned, holding his head, "What the Hades happened last night?"

"Did you ever drink again" Percy asked

"Nope, and I don't plan on it. Though Zeus did make me come close a few times" Perseus responded, to which many of the demigods and gods laughed.

Because of his hangover, Percy stayed in bed for most of the day and when he was feeling better, decided to go see his mom.

"Momas boy" Ares said

"Says the overgrown war god, who still lives with his mother and lost a fight to an untrained twelve year old" Perseus retorted.

Ares got up to make a move but got shot in the shoulder, "As I have yet to warn you in this universe, I should tell you the next one will be between the eyes" Perseus said, and Zeus began to wonder why his other self hasn't killed Perseus yet, as did many of the other gods and demigods in the room did.

"Hey mom," Percy said, walking into his mom's apartment.

"Percy!" Sally said seeing him, "How are you?"

"Good," Percy replied, "How's Andy?"

"Who's Andy" Percy asked

"My Aunt and Dad's little sister" Zoe said, before her father could answer, "she awesome though it weird only being like a year younger than her though"

"She's good," Sally said, "how's the job going?"

Percy got a part time job after the giant war and is saving up enough money to go to London and work with his Uncle Shaun.

"Where you planing this before your universe's me decide to go dumb" Annabeth asked

"Yes and no" Preseus replied, "If she didn't break up with me, I would have probably mentioned it as we both already graduate from the university in New Rome, as an option as to what we could have done next. But as you all already know that didn't happen"

Weeks turned into months and it wasn't long until Percy got a little surprise one morning.

"Was that surprise me" Apollo asked

Perseus Gasped in shock, "It totally was how did you know" he said with so much sarcasm that it made everyone question if he was lying or telling the truth, even Apollo couldn't tell.

"What are you doing here?" Percy asked when he opened the door.

"Yup definitely a God or Goddess" Percy, and the other demigods mumbled, much to their parents displeasure, and Artemis's and Hestia's amusement.

"delivering your daughter Perce," the man replied, "her mother said it's your job to name her. Also, I suggest that you leave New York asap. It's nice seeing you cuz."

"Why would Percy need to leave New York? and It's either Hermes or Apollo, they're the only ones that call Percy cuz" Annabeth began theorizing her thoughts.

"Very wise of you Athena spawn" Perseus replied which ticked off Percy a little. 

Percy nodded and took a taxi to his mom's apartment.

"Who is the little one Percy?" Sally asked when he arrived

"My daughter apparently," Percy replied, "I don't actually remember much of that night. Actually come to think of it, I don't remember a single thing."

They talked for a bit longer, until Sally said one thing that would change the Jacksons lives forever, "Me, Paul, and Andromeda are all going to go with you to London"

"That honestly surprised me" Perseus said

"That's because Grandma already knew" Zoe said absentmindedly, "oh shit I wasn't suppose to tell you" Perseus however just let it go, while Artemis glared at Zoe for her use of language

"W-What?" Percy asked stuttering, "Why?"

"For one, I'm not going to leave my granddaughter without her grandmother," Sally said, "and two, you'll need someone to keep her for you while you work with my brother and his... associates."

"What does your uncle do" Athena asked

"If you would let me read you would find out" Annabeth said mocking her mother, who just pouted on her throne, because her daughter made a good point.

"That is actually a good idea," Percy stated, "according to Apollo I have to be out of New York asap. No idea why though."

"Cuz was I the surprise or your daughter" Apollo asked

"It was definitely you, I was totally not expecting a god to deliver me a child that just so happens to be my daughter" Perseus sassed, while his daughter laughed at her oblivious uncle from another universe.

"at least one thing is the same with you Percy" Annabeth mumbled to Percy before continuing to read

"What are you going to name her?" Paul asked.

"Zoe Diana Jackson," Percy replied, "I just feel as if it's the right name for her."

'I've figured it out I think' Annabeth thought to herself, but not believing the answer

"Are you going to tell her about your past?" Sally asked.

"no" Perseus said

"Yes" Percy and Zoe said, causing Perseus to have a glaring match with the two and quickly loosing to his daughter. Annabeth ignored them and continued.

"Yes," Percy replied, "there will be no secrets between me and Zoe."

"Ha I was right" Percy exclaimed

"Sarcasm ever heard of it" Perseus countered before the two continued the glaring match

That night, Percy and his family packed up and left New York City. As he got on the plane, Percy said, "Goodbye New York City for a few years."

1 Year later

A woman in a hooded outfit walked up to a man who was in his early twenties and said, "Where other men blindly follow the truth, remember..."

"...Nothing is true," the man finished.

"This hurts me" Apollo said, "how can nothing be true I'm the god of truth, it must exist" Annabeth decided to ignore Apollo's antics and continue reading over the god's cries of protest.

"Where other men are limited by morality or law, remember..."

"Everything is permitted," The man finished once again.

"That sounds cynical" Athena stated

"It's an observation of reality. To say nothing is true observes that society is fragile and we shepherd society to our will. While everything is permitted is recognizing that our actions are our own and we must live with said actions" Perseus explain

"Ezio explained it better than you" Zoe said

"I don't disagree" Perseus said, "I just simplified it" 

"a fair observation, if it wasn't for us" Athena said

"We still have you thus it remains a 'fair observation' Athena" Perseus retorted, all the while still having the glaring competition with Percy

The man stepped forward and as his voice trembled with the intensity with which he spoke, said "We work in the dark to serve the light." 

The man flipped his hood on showing only his mouth as it stretched into a grin, "I am... an Assassin."

"Good to have you in the British Brotherhood nephew," a man in his early forties said, "how is Zoe?" 

"She's doing good Uncle Shaun," The man said, "also when she turns 7, I want her to begin her training."

Shaun nodded and said, "Alright. Oh and you have your first mission tonight."

"What is it?"

"There is a new Templar that joined in a week ago and I want you to keep an eye on them for a few days or at least convince them that the templars are no good, "Shaun replied.

"Their name?"

"Jason Grace,"

"Should I be scared" Jason asked

"If you refuse reason yes" Perseus replied 

 Shaun said as the man froze, "What's wrong Perce? You know them?"

"Yeah we know him"Percy and Perseus said ending their glare competition, "he's my brother from another mother"

"Do I die" Jason asked

"No not yet at least" Perseus answered

Percy slowly nodded

"he's like a brother to me," Percy replied, "I don't want him to be a part of this, but I won't kill him."

"Alright, but if he doesn't listen to you then kill him," Shaun said, making Percy sigh

"Fine," Percy said, "but I'll make sure that it is a swift death. Although I'd rather not kill Jason, I'll do it."

"At least it will be quick" Jason said

"Don't worry uncle Jason you survive, and dad doesn't try to kill you" Zoe said not realizing she gave a hint to who her mother could be, but it flew over Zeus's head.

Percy then left the Brotherhood's building and headed to a building where he'll be able to get a good look at the people below him. He activated his Eagle vision

"What's eagle vision" Malcolm asked, before his mother could, who looked mad at the fact

"It's explained later" Perseus said much to the disappointment of Athena and her children, "don't ask me how it works as I don't know" 

 and the whole are was tinged a blue. He looked around and saw someone who was colored yellow.

Bingo, Percy thought before jumping downing and landing on the sidewalk, scaring a family who was walking. Percy then made his way over to Jason as he flipped his hood down. When he reached Jason he said, "It's been awhile hasn't it Sparky?"

Jason froze and turned around.

"Why do you two lie it's obvious even my other self thinks I'm going to die" Jason cried out as Piper started to comfort him

"Perce?" Jason asked as the son of Poseidon nodded, "What are you doing here?"

"Oh just planning on how to murder you and figure I would ask how you would like to die first" Perseus joked, scaring Jason.

"I could ask you the same thing Templar," Percy replied coldly, "why did you join the Templar Order Jace?"

"They capture Piper," Jason replied, "they said if I didn't join them then she'd be killed."

"Why didn't my daughter just charmspeak her way out" Aphrodite asked

"It'll come up later I remember this joyful conversation" Perseus replied

"Swear it on the River Styx," Percy said as Jason swore on the River Styx causing thunder to rumble throughout the sky, "come on. We'll talk more at my place."

Percy then put his hand on Jason's shoulder and vapor travelled to his place.

'welp I'm surprised he lives, none of my kids have been able to do that before' Poseidon thought

"wait do you think you can teach me that, other me" Percy asked

"Sure it's pretty useful once mastered, but before then it's just a pain in the ass to deal with the energy drain" Perseus responded, causing his younger self to smile, and Zeus to consider killing the two of them.

"Whoa," Jason said as he leaned over a bit, "what was that?"

"Vapor travel," Percy replied, "mom?"

"Percy?" Sally said walking out of the kitchen, "what is Jason doing here?"

"Why is Sally being suspicious of me" Jason asked

"Part of dad's old life, she was worried more so for me instead of dad" Zoe explained

"Piper got kidnapped by the Templars and threatened to kill her if Jason didn't join them," Percy replied, "Where is she?"

"Sleeping," Sally replied.

"Who are you two talking about?" Jason asked

"Me" Zoë said cheerfully

"Swear on the Styx not to tell anyone what I am about to tell you," Percy told him, "it's bad enough I don't remember that night, but if Zeus comes and takes her then I'll send him to Tartarus myself."

"Like you could" Zeus boasted

"Would you like to visit tartarus then Zeus, I heard it's nice this time of year" Perseus said with a mad grin, while Percy and Annabeth paled at their memories, before Annabeth continued with reading hoping to prevent any escalation between the two.

Jason then swore on the Styx and thunder rumbled throughout the sky.

"Wait" Percy said, "Why does thunder rumble when making an oath on the styx"

The gods never expected this question, and they themselves were left clueless as to why, which only served to frustrate Athena.

Percy then took him into a room where Zoe was sleeping.

"This is my daughter," He told Jason, "She's a Tri-Blood. The Granddaughter of Poseidon and Sally Jackson. Her mother is unknown. I have absolutely no memory of the night she was conceived. Maybe when she's older I'll be able to tell, but at the moment? No."

'you might want to expand that grandfather list' Percy thought wondering how his other self still lives

"What are we doing here anyways" Jason asked changing the subject, "I thought we were going to save my pregnant wife."

"wait I'm pregnant" Piper exasperated, 

"wait, I'm going to be a grandmother" Aphrodite screeched, causing most to acquire partial hearing loss, She then took Piper aside and to start planning for the children that aren't.

" If you want to know Jason you two are 24 when she gets pregnant in my universe" Perseus said trying to calm the shocked Jason, trying to think if his Piper is pregnant or not. 

Percy froze and looked at Jason dead in the eyes.

"You two are having a kid?" He asked eyes wide, "Since when?"

"A month ago," Jason replied, "What's the plan on getting my wife out of there?"

"I'm an Assassin and they're Templars," Percy told him, "I guess you can tell what the plan is."

"You kill?" Jason asked surprised.

"No I put them into an eternal sleep where they visit uncle H" Perseus said

"That's a pg version of saying you kill them Perseus" Athena said

 Perseus just shrugged his shoulders and said, " I see the little kids in the room I was trying to be nice" 

"I was sent to either kill you or convince you to leave the Templar Order," Percy told him, "now then we are going to do this the demigod way. Me with water and you with lightning. No holding back."

"Dear us that's going to be destructive" Poseidon and Zeus said knowing how destructive they were when they rarely worked together

Jason nodded and Percy vapor travelled to the place they needed to go.

"Wait," Percy said turning to look at Jason, "shouldn't she be able to get out on her own? I means she has charmspeak."

"See I told you this comes up Aphrodite" Perseus said, annoyed because the goddess wasn't paying attention, as she was busy fussing over yet to be existent grandchildren.

"They knocked her out then gagged her," Jason replied, "at least that is what they told me and they even swore on the Styx."

"Demigods then," Percy said, "alright. Let's get this show started"

"Wait does that mean there's more traitors then" Clarisse asked

"It's likely, but I think I might have killed them all, which will come up later" Perseus said, "and it's not exactly traitors, because they didn't technically betray Olympus, as Olympus is neutral on the matter as far as I know"

Timeskip to after the rescue

"Dammit I wanted to hear the fight" Ares whined throwing his popcorn, that he summoned across the room.

"big baby" both Percy's mumbled, not wanting to deal with Ares throwing a temper tantrum

"Thank you Percy," Piper said once they were back at Percy's house.

"Think nothing of it Pipes," Percy replied holding his awake daughter, "I just can't believe that I'm a single father."

"Do you know who the mother is?" Piper asked him.

" I do now, still have trouble believing it at times" Perseus said and those who didn't figure it out asked who. "If I told you it will ruin the story" he answered much to Zeus's annoyance as he can't figure it out.

"No," Percy replied, "I definitely know that she isn't your sister."

"Wait you mean to tell me this cute little thing isn't my daughter...inconceivable" Aphrodite said pointing to Zoe, leaving Piper enough time to escape her mother and hide behind Jason, fearing the things she heard.

Piper sighed in relief.

"and my own daughter is happy about that" Aphrodite said before she started crying again

"How's Annabeth taking my disappearance?" Percy asked them.

"She doesn't even know," Jason replied

"Good," Percy said looking at the couple, "she doesn't even need to know"

"A bit harsh Perseus" Annabeth said

"Yeah well the other you is a bitch so" Persues defended and proceeded to dodge Athena's spear, "What she left me for a job do expect me not to be salty" Perseus said, while others realized Zoe disappeared and Perseus was acting like it was normal.

"She'll find out when she returns to CHB," Piper said, "may I hold her?"

Percy nodded and handed his daughter to Piper.

"She's so beautiful," Piper said, holding Zoe.

"Piper, you must swear on the Styx that you won't tell anyone where I am unless it's with my permission, or about Zoe."

"I swear in the Styx that I won't tell anyone where Percy Jackson is without his permission and that he has a child," Piper said as thunder rumbled throughout the sky.

"Good," Percy said, "Also Jason, I need you to be my eyes and ears in the USA. I have a phone that I got a few weeks ago and I have a feeling that you have one as well."

"Got me there," Jason said as Percy wrote his number on a paper and handed it to him, "thanks"

Jason then wrote his number on a piece of paper and handed it to his brother from another mother.

"Same," Percy said taking the paper, "well I think that the two of you  should get back to New Rome. It's nice talking to you"

Piper handed Zoe back to him and the married couple left Percy's place and headed back to New Rome.

"well that was interesting" Annabeth said, before offering up the book to anyone willing to read

"we" Conor started

"will" Travis continued

"Do it" They finished together

Annabeth being her wise self handed the book off to Nico, who took the book reluctantly. And the Stoll brothers backed off because of the skeletons, keeping them away from Nico. "I said no underworldy powers, Nico. Doctors orders" Will stated annoyed that Nico isn't listening to him.

Nico continued to ignore him before continuing to read.