Lily

“Like water leaking through a dam," said Piper.
"Yeah," smiled Percy. "We've got a dam hole."
"What?" Piper asked.
"Nothing," he said. "Inside joke.”
― Rick Riordan, The Mark of Athena

“It's okay,” he said. “We're together.” He didn't say you're okay, or we're alive. After all they'd been through over the last year, he knew that the most important thing was that they were together. She loved him for saying that.”
― Rick Riordan, The Mark of Athena

“Percy, let me go" she croaked. "You can't pull me up."
His face was white with effort. She could see in his eyes that he knew it was hopeless.
"Never," he said. He looked up at Nico, fifteen feet above.
"The other side, Nico! We'll see you there. Understand?"
Nico's eyes widened. "But-"
"Lead them!" Percy shouted. "Promise me!"
"I-I will."
Below them, the voice laughed in the darkness. Sacrifices. Beautiful sacrifices to wake the goddess.
Percy tightened his grip on Annabeth's wrist. His face was gaunt, scraped and bloody, his hair dusted with cobwebs, but when he locked eyes with her, she thought he had never looked more handsome.
"We're staying together," he promised. "You're not getting away from me. Never again."
Only then did she understand what would happen. A one-way trip. A very hard fall.
"As long as we're together," she said.
She heard Nico and Hazel still screaming for help. She saw sunlight far, far above- maybe the last sunlight she would ever see.
Then Percy let go of his ledge, and together, holding hands, he and Annabeth fell into the endless darkness.”
― Rick Riordan, The Mark of Athena

“Very slowly using two fingers, Annabeth drew her dagger. Instead of dropping it, she tossed it as far as she could into the water.

Octavian made a squeaking sound. "What was that for? I didn't say toss it! That could've been evidence. Or spoils of war!"

Annabeth tried for a dumb-blonde smile, like: Oh, silly me. Nobody who knew her would have been fooled. But Octavian seemed to buy it. He huffed in exasperation.

"You other two..." He pointed his blade a Hazel and Piper. "Put your weapons on the dock. No funny bus--"

All around the Romans, Charleston Harbor erupted like a Las Vegas fountain putting on a show. When the wall of seawater subsided, the three Romans were in the bay, spluttering and frantically trying to stay afloat in their armor. Percy stood on the dock, holding Annabeth's dagger.

"You dropped this," he said, totally poker-faced.”
― rick riordan, The Mark of Athena