Katharine

“And,” Annabeth continued, “it reminds me how long we’ve known each other. We were twelve, Percy. Can you believe that?”
“No, he admitted. “So…you knew you liked me from that moment?”
She smirked. “I hated you at first. You annoyed me. Then I tolerated you for a few years. Then—”
“Okay, fine.”
She leaned in and kissed: him a good, proper kiss without anyone watching—no Romans anywhere, no screaming satyr chaperones.
She pulled away. “I missed you, Percy.”
Percy wanted to tell her the same thing, but it seemed too small a comment. While he had been on the Roman side, he’d kept himself alive almost solely by thinking of Annabeth. I missed you didn’t really cover that.”
― Rick Riordan, The Mark of Athena

“Annabeth pressed her lips to Percy’s ear. “I love you.”
She wasn’t sure he could hear her—but if they died, she wanted those to be her last words.”
― Rick Riordan, The House of Hades

“To my wonderful readers:
Sorry about that last cliff-hanger.
Well, no, not really. HAHAHAHA.
But seriously, I love you guys.”
― Rick Riordan, The House of Hades

“Percy pulled Annabeth close and kissed her...long enough for it to get really awkward for Piper, though she said nothing. She thought about the old rule of Aphrodite's cabin: that to be recognized as a daughter of the love goddess, you had to break someone's heart. Piper had long ago decided to change that rule. Percy and Annabeth were a perfect example of why. You should have to make someone`s heart whole; that was a much better test.”
― Rick Riordan, The Blood of Olympus