AN: So...I have no idea how this came into being. Anyway, I made Hestia and Hades Olympians...there's no real set time. I was thinking maybe after TLO but my plan for this is to do different one shots with Percy using this power. Some may be AU, like, really AU. And I think that's it for now. Let me know what you think! And I wasn't sure about the title, if you have a suggestion let me know!

He really didn't mean to. Really. But Athena had caught him off guard while he was trying to research something.

"Poseidon?! What are you doing here? And in teenage form?" Athena asked.

The person who she was addressing was not the god of the sea but rather his demigod son, Percy Jackson. Freezing for half a second, arm out stretched for a book, Percy put a hidden talent to use.

"What? I'm not allowed in the library? All gods can come here." Picking up the book he flipped through the first few pages, skimming over them. He desperately hoped she didn't figure it out. Demigods were forbidden from this library.

A rush of air escaped Athena, her version of spluttering, before she replied. "Of course but you never do! And why in this form?"

Percy shrugged. "Change of pace. My Kingdom is well and flourishing, my son can handle anything while I'm here." Percy found it weird to be talking as his dad. And he just called Triton his son!

Even with his back to the goddess Percy could tell she was trying to figure out why he was there. She apparently gave up and went on to a different part of the library. Sighing Percy left with a book and went to his father's Kingdom.

Poseidon was deep in thought. He went to the library on Olympus but paused before going in. He heard Athena talking to...him? That was his voice but he was most definitely standing outside the library. After Athena left he looked inside a window. Percy? How did Percy change his voice like that? Poseidon quickly flashed back to his Palace. Not long after Percy appeared.

"Hey dad." Percy greeted as he swam in.

"Hello Percy. What brings you here?"

"I found this. A book about the plants that have gotten sick. It has a section on different illnesses." Percy handed the book over.

"Oh, thank you. I've been meaning to go to the library." In fact that was the whole reason he went in the first place. "Hey Percy?" He called after his son who had started leaving.

He turned back. "Yeah?"

"I-uh I saw you in the library."

"Oh?" Percy tensed, he wasn't allowed there.

"How did you change your voice?" Poseidon blurted out.

Percy rubbed the back of his head. "I don't know. I've always been able to do that. Any voice really."

"Any voice?" Percy relaxed, glad his dad wasn't mad at him.

"Pretty much. I mean, I haven't tested it much." He shrugged.

"How about Zeus?"

"Uh, I guess." Percy titled his head to the side slightly, as if listening to something. "I am Zeus, King of the gods and Lord of the Sky! Bow down before me!"

Poseidon burst into laughter. "That was spot on!" He chuckled. Percy smiled.

"Do you eat cereal? You look like you don't eat enough cereal. Here have some whole grain oats. After this you'll be smart!" This brought Poseidon into a whole new fit of laughter. Percy had completed the impression of Demeter with his hands on his hips and even finger wagging! Percy soon joined his father.

"I have-an idea!" Percy gasped as he calmed down. Both he and his dad were smiling widely. "I was able to trick Athena. What about the rest of the council?"

"How so?"

"You turn into your teenage form. We both go in, I change my voice and see how long it takes them!"

"I love it! The next meeting is tomorrow."

"We need to work out the details." Percy smirked.

The next day...

Thirteen of the fourteen Olympians were sitting on their thrones.

"Where is he?!" Zeus yelled.

"He's usually not late. Think something happened?" Hermes asked.

"I don't care! He should-" Zeus was cut off by the door slamming open. A figure tossed through the air before landing in a crouch.

"Poseidon!?" Hades asked. Before anyone else could answer another figure was seen.

"What is going on?!" Hera asked. The second figure was also Poseidon also in teenage form. The first Poseidon threw an arm out. A blast of water formed and shot at the second Poseidon. The second one dodged before sending back his own. Neither seemed to have a weapon, which relieved the council slightly. Before it could escalate Hades and Zeus jumped off their thrones and grabbed a Poseidon each.

"Poseidon? Tell us what is going on!" Zeus demanded. Both Poseidons had stopped struggling but they were now glaring at each other.

"I was walking across Olympus when he attacked!" The Council blinked. They had said that at the same time and in the same voice.

"Athena?" Artemis asked as she saw Athena's thinking face. She shrunk down to the same height as the two sea gods.

"Poseidon." She started, glancing between both, trying to find differences. "I saw you in the library the other day. What book did you take home?" She asked.

"Elizabeth Mikka's Botanical Notebook. It has everything you need to know about underwater plants." Both had answered at the same time.

"Who is Elizabeth Mikka?" Apollo asked. Truly curious.

"Famous mermaid author. She has published five books." Again together.

"That's just a little creepy." Hermes commented. This making both Poseidons smile.

"Wait a minute..." Athena narrowed her eyes. "One of them is Perseus. Who else looks so much like Poseidon in teenage form?"

"That helps how?" Hephaestus asked.

"Perseus has that pen. It always returns to his pocket. Whichever Poseidon has it, is actually Perseus."

"Empty your pockets." Zeus demanded. Both he and Hades had let them go when it was apparent they weren't going to attack each other. In both their hands they had a few drachmas, a stick of gum, lint, and a ballpoint pen. "Uncap the pen." Zeus ordered. Both did as they were told...nothing happened. "What?!" Zeus' face started turning red.

Both Poseidons started laughing.

"Should I be insulted that my brothers can't figure out which one is me?" Both asked. The walked towards each other so that they were standing next to each other and facing everyone else. "Yes one of us is Percy and one is indeed Poseidon. Which one is which?" They asked. They merely smiled as everyone stared at them, trying to figure it out.

"Any clues?" Apollo asked.

"None." They answered.

Apollo slouched. It was taking a long time and Poseidon and Percy was worried Athena's head would explode.

"How could their magic signatures be so similar!?" Athena finally exclaimed.

"They are father and son." Hades pointed out. "And I think they're enjoying this too much." He looked at them from the corner of his eye as he stayed facing Athena.

"Same hair, same eyes, facial structure, build, useless pens, voice, reactions, everything!" A knock on the door interrupted them.

"Enter!" Zeus commanded. A nervous looking messenger came in.

"I have word for lord Poseidon." They could make out a few scales on his neck and arms.

"Yes?" The poor guy jumped as both Poseidons answered.

"Er, lord Poseidon?"

"Yes?" The guy seemed hopelessly confused. He looked to Zeus.

"One of them is real the other is his demigod son. You can trust both. We were in the middle of figuring out which on was which." Zeus explained while waving a hand dismissively.

"Oh, well, I- er... I- uh..." He kept glancing back and forth between the two. "I'll just-ah...wait..." He bowed. "Milords." He said to the two amused sea gods.

"Bye Trevor!" They called. "I hope that wasn't too important." They said to each other. Though neither looked too worried. "Probably about the plants." They shrugged.

"Wait why were fighting in the first place?" Ares asked.

"To confuse everyone further."

"I have an idea!" Athena announced before leaving the room via flashing.

"Well, thanks for sharing." Hades rolled his eyes. She came back but with her daughter Annabeth.

"Why are there two Percys?"

"You didn't explain anything?" Zeus asked.

"I never thought about that way. Not two Poseidons but also two Percys." Athena pondered. "Now, Annabeth, we need to figure out which is which."

"Hello." The lookalikes stuffed their hands into their pockets and Annabeth's mouth dropped.

"They sound exactly alike!" She stalked closer. Peering closely at each. She then walked to Ares, gesturing for him to shrink down, as well as Artemis and Apollo. There was a whispered conversation before the three Olympians nodded. Apollo and his sister stood opposite of each other, one each side of the Poseidons. The sea gods looked at each in confusion. Ares stood next to Annabeth.

Suddenly he charged forward as the twins started shooting. Both looking extremely bemused on why they were doing so. Both sea gods reacted. Both dodged the arrows, one punched Ares in the face, the other in the chest. After Ares was subdued they took a second to glance at each other before they separated to take down the twins. There was a brief scuffle between Artemis and her opponent due to her hunting skills. Apollo was taken out quickly, he really needed to work on his close combat. By the end neither were breathing heavily.

"What was that supposed to accomplish?!" Demeter exclaimed.

"That one is Percy." Annabeth pointed to the one that took down Artemis.

"How do you know?" Athena asked her daughter.

"His hand went for his pocket when Ares charged. Percy keeps his sword there. Lord Poseidon, as far as I know, can summon his Trident or would use his powers. Percy reaches for his weapon first. Thus, that is Percy."

"You were always the smartest." The one she had pointed to said, this time in Percy's voice. He walked forward before kissing her forehead.

"Of course Seaweed Brain. Some one has to be." She smiled and rolled her eyes.

"That was fun!" Poseidon, now in older form, clapped a hand on his son's shoulder.

"How'd you do the voice thing, Percy. And how'd you sync your voices so well?" Hermes asked.

Percy shrugged. "I've always been able to do that. And my dad took slight- uh,well, mind control, it was the only way to sync so well." He was smiling by the end.

"Any voice?" Annabeth asked, curious.

"Yup."

"How would you feel with scaring the pants off some campers?" She smirked evilly.

"What?" Percy was intrigued.

"Oracle voice?"

Percy titled his head slightly, his eyes lightly glowed green. "Approach seeker, and ask."

"That was freaky!" Apollo exclaimed.

"Like I said, any voice." Percy shrugged, smiling. "Let's go. The Stolls need a lesson." His smile turned into a sinister smirk. Some gods shivered. Poor Stolls. "Bye! I had fun! We should do it again sometime!" The demigod waved over his shoulder and he dragged Annabeth behind him.

"Anybody else scared for those boys?" Hades asked as he looked warily at Percy's retreating back.

Everyone's hands raised.

AN: Okay so the next chapter will probably be the prank. Let me know if you have any ideas/suggestions. I may not update often, this was just to help me out of a writing slump. But I'm willing to continue if people like this.

So low down on Percy's voice power.

He can copy any voice, the more powerful then the more his eyes glow. And they glow the eye color of the person he's imitating. So like with the Oracle his eyes glowed the same green as the gas, because the Oracle is more powerful. With his dad they glowed slightly but since they had the same colored eyes no one noticed. He tilts his head for the intial copy but it doesn't have to stay like that. Just ask if your confused!

I have an AU in mind so something else may come out without prompting. :)

Review please!

~Dawnmoon