It wasn't difficult to find Louisa. Not difficult considering you were capable of breathing underwater and withstanding extreme pressure, which Percy was. When Jessica said Louisa was after their dad, it only really made sense she would go straight to him rather than have someone stop her. Percy would have done the same thing had their roles been reversed; he had his own questions for Poseidon.

A playful shark guided him to Atlantis, suddenly empty of other sea life. Percy made his way to the throne room, the currents sharper and angrier than he had ever seen them. Poseidon was sat in his throne, looking ten years older and very weary, trident hanging loosely in his hand and slumping. Louisa stood before him, ranting incessantly, slipping between English and Greek. The god looked up as Percy approached, giving a tired smile. Louisa glowered at him, called him a few choice names.

"Louisa." Poseidon said sharply. "You have no need to be mad at Percy or Sally, they have done nothing wrong."

"Prayin'." Louisa spat. "Fat lot of good that did me."

"There wasn't much else she could do."

"Why take me?" Louisa demanded. "Why not him, why take me at all, why not just leave a good thing be?"

"The Fates-"

"Ooh, 'cos they're great."

"Louisa, do not insult them. I took you because you would- are the most destructive. Percy, don't look at me like that, you didn't mean to destroy the bridge, not really." Percy hunched his shoulders. "You both have great potential for destruction, it's in your blood, but- as twins- you represent the two sides of my domain. Calm," He gestured to Percy, "and stormy." To Louisa. "And I apologise that you are like that, but had you two grown up together, your powers and abilities would have clashed repeatedly. It was best you grew up apart, learnt to control your powers as you matured."

"What was that weird shock thing earlier?" Percy asked, lifting his right hand a fraction. Louisa looked at her left with a frown.

"That was recognition. You two have no idea how many times your paths had crossed, how many times you've been so close and so far apart. Being reunited has sparked the connection you two should have shared since birth. For example, if one of you becomes ill or hurt, the other will know."

"Oh, great." Louisa muttered. Percy pinched his left arm experimentally, her own twitching. She glared at him. "If I punched him in the face, how much of it would I feel?"

"Don't fight." Poseidon ordered. "Percy, I must warn you that Louisa has bouts of temper, as you may have noticed-"

"My leg still hurts."

"-and sometimes this triggers her powers, so you may need to step in to make sure nothing goes seriously wrong. Louisa, Percy has a few... confidence issues with his powers." Louisa looked at Percy questioningly.

"People get hurt when I use them." Percy said quietly. "I'd rather not."

"Teach him to use them with and without his emotions, but for the love of the gods, don't kill anyone. And apologise to Sally. She meant well, she was only trying to get to know you."

"Besides," Percy interjected with a smile, "you haven't had Mom's cooking yet." Louisa hummed, flipping a glare to her father.

"I ain't happy with you."

"I know."

"So ya ain't gonna blast me if I do this then, are ya?" Louisa made an obscence hand gesture; Sally would have had Percy's hands for that, but Poseidon just sighed and shook his head. "You'll be gettin' an official letter of complaint too."

"Mind if I add a few words?"

"As long as they're very rude, ta the point 'n' condescendin' as hell."

"Maybe not condescending... Dad has already nearly blasted me."

"Why?"

"I sat in his seat."

"Oh, boo hoo."

"Go away." Poseidon said. "Apologise to Sally," he reminded his daughter, "don't fight and help each other out. I'll be keeping an eye on things, so if you start fighting, I'll be sending in the reinforcements."

"Ahhh, Bob the Shark!" Louisa exclaimed happily. "I love Bob!"

"No, not Bob."

"Oooohhhh..." Louisa pouted. "But I love Bob."