Hi! It's FandomQueen713 here! It's my first story, please don't hate! This is a one-shot on Jason's jealousy towards Percy about Thalia. I know that some of the characters are a bit OOC, particularly Jason, so sorry if that bothers you.

Disclaimer: I own nothing, because sadly, I am not Rick Riordan *sniffle*.

Jason POV

Jason was happy. Gaea was gone, for now at least, Percy and Annabeth seemed to have recovered from Tartarus, Nico was staying at camp, and Piper and Jason's relationship was stronger than ever. Everything seemed fairly calm at Camp Half Blood, until a group of girls with bows entered.

Jason was alarmed at first, reaching for his coin to flip into a sword, before he saw Thalia, his older sister. The group of girls were Artemis' huntresses. Thalia was smiling happily, and had widened her arms as if begging for a hug. This was surprising, given the whole Oath against men thing, but given that Jason was Thalia's brother, it was surely okay.

He rushes forward before realizing that someone else was already hugging her. Percy Jackson. Annabeth stood right behind him, and as soon as Percy released Thalia, Annabeth took his place. Jason stared blankly at the sight. He could understand Annabeth hugging his sister; according to those photos in the Zeus cabin, they had some history, but what was Percy doing?

Thalia let go of Annabeth and Jason started towards them, expecting a hug from Thalia. He was rejected, as it seems, because Thalia had already had an arm over both Percy and Annabeth, and they were walking towards the mess hall. Jason followed them, wondering what the Hades they were talking about.

"-and we went to the Hoover Dam to fight the Minotaur. But when I asked to go to the dam snack bar, they told me they had to go to the dam restroom." Thalia was saying, barely holding back a laugh. Percy suddenly burst into loud laughter, and Thalia released a burst of giggles. Jason couldn't see what was so funny about it, and Annabeth also seemed slightly confused.

This was probably the most shocking thing. As close as Annabeth and Thalia were, Annabeth didn't know what was going on either. Annabeth opened her mouth to say something, ad Jason leaned forward as he trailed behind them to catch what she was about to say.

"Was this whole dam thing during the time I got kidnapped by Luke to hold up the sky?"

"What? Kidnapped?" Jason thought, but was distracted by the sight of Thalia and Percy solemnly nodding. Jason couldn't take it anymore and he ran in front of them.

"Thalia, what's going on? This dam joke thing with Percy? And why did you hug him, I thought you couldn't date anyone?" He asked, walking backwards. They stared at him in shock for a second and Jason thought,"So I was right! I can't believe Thalia broke her oath for Percy Jackson?!" However, soon after he said it, Thalia, Percy, and Annabeth burst into laughter once again.

"You thought..we...me...Kelp Head..he's like my brother..." Thalia said between laughs as she gasped for breath.

Percy composed himself and said,"No way, Bro! She's like a sister to me! I could never date Pinecone Face!"

Thalia gave a fake glare at him and shoved Percy. Meanwhile, Annabeth burst into another round of laughter and Thalia said,"What are you laughing at, Owl Head?"

"Lightning head!" Was Annabeths retort.

"Wise girl!"

"Hey that's my nickname for her!" Percy said, and then shoved Thalia.

"Whatever, Seaweed Brain" Thalia said, sticking her tongue out at him.

"My nickname." Annabeth says, raising an eyebrow.

They began careless banter, and ignored Jason as they walked away, shoving and arguing. All that Jason remembered was how Thalia said Percy was like her brother. Percy was like her Jason according to Thalia. No, Percy was way closer to Thalia than Jason was.

Percy was her brother. Jason stalked away and headed to the sword fighting arena. He needed to blow some steam. But of course, Percy Jackson was already there, demolishing Clarisse La Rue, head counselor of the Ares cabin. Thalia and Annabeth were cheering him on, until finally Percy had a sword poised at her throats and had somehow gotten her own sword at Clarisse's back. She glared at him, muttering about stupid sons of Poseidon, before embracing him.

Jason felt like fainting at that sight. The daughter of the war god just lost to Percy, and hugged him?! He caught her saying some words to Percy.

"Some day I'll get you, Jackson."

Percy replied with a smirk,"Like your father did?"

Clarisse glared and punched him as he released her. "Just because you defeated my dad doesn't make you some kind of god, idiot."

Thalia interrupted,"But getting offered immortality and being the best sword fighter in 300 years does. Like...oh wait a minute, Percy did!" Clarisse fake glared and went away, but Jason stared. Percy was offered immortality? He defeated the god of war?

Percy seemed slightly uncomfortably with the attention, which meant he was either modest or it was a lie. Jason assumed it was the latter. He cried out,"I bet I could take you!"

Percy looked over and grinned at him."I'm in Grace. Let's go!" Jason hated how happy the son of Poseidon was. He wanted to wipe that smile off his face.

Thalia yelled out,"Ready? Begin!" She then made a motion like an anouncer would. Jason raised his sword and charged at Percy, but Percy simply sidestepped. He thrust his sword with ease and Jason found himself faltering back, playing defense now rather than offense. And then Percy did the most irritating thing ever.

He yawned. It wasn't intentional, he was probably just tired, but Jason who was full of rage, took it to mean that Percy didn't think he was competotion. Jason started moving his sword harder and more violently, but Percy deflected it and nearly knocked Jason's sword out of hand.

Jason couldn't hold back his anger anymore, and shocked Percy with lightning. People were filling the arena now, watching the fight, and they gasped. Percy just grinned and water started swirling around both of them in a miniature hurricane, easing Percy up into the air. Jason let the wind lift him up too, but could not easily fight, as water kept slashing his sword back. Percy went for the kill and disarmed Jason, before pressing the point of Riptide against his throat.

Jason accidentally stopped flying at shock of losing, but Percy made his water hurricane lift Jason up too. That loyal kind son of Poseidon! He just easily won against Jason and now had to use his powers to help him too!

Percy slowly released them both and they softly landed on the ground, Jason completely soaked while Percy was dry as can be. Percy smiled and said,"Sorry about that, Jason. But nice sword fighting, I think if you held it a little looser like this..." Percy started giving tips to Jason about how to improve, and that did it.

Jason interrupted by shouting,"Shut up, Percy! You steal my sister, my friends, show me up with your stupid powers! Go to Tartarus, you belong there!" And with that, Jason stormed out, pun intended. He heard Annabeth's cry and Thalia's angry shout, but he heard nothing from that son of Poseidon. Jason glanced behind, and saw Percy sitting down in the arena. He had his head in his hands and Percy was...crying? Jason stopped and stared, but the older boy didn't seem to notice.

Percy seemed to be having some kind of breakdown, because he kept shaking and saying things."Bob...Akhlys, gods I didn't mean to poison her...Damasen sacrificed himself and all I'm doing is making everyone sad. I should've stayed there, and held the doors open," Annabeth was trying to comfort him, but Percy was lost.

Jason felt a twinge of regret at what he did to his friend, but he left, continuing to plot how to break that son of Poseidon.

Little did he know that Jupiter was watching over Jason at that moment, and was shaking his head at how disgraceful and horrible his son was acting to the Hero of Olympus.

Just because of one dam joke.

I hope you liked that story, please leave a review. Feel free to be critical about it but only constructive criticism. Once again, I know Jason was OOC, and that according to the Heroes of Olympus series, no one had breakdowns after Tartarus, but I always imagine that it would leave Percy, Nico, and Annabeth traumatized. Also, I despise Jason, as you can probably tell, and I know it ended kind of harshly but oh well. It's my first story, so please be considerate! Leave a review, favorite, follow, whatever! I hope you enjoyed it.