Rick Riordan, The Mark of Athena

Annabeth,” he said hesitantly, “in New Rome, demigods can live their whole lives in peace.”
Her expression turned guarded. “Reyna explained it to me. But, Percy, you belong at Camp Half-Blood. That other life—”
“I know,” Percy said. “But while I was there, I saw so many demigods living without fear: kids going to college, couples getting married and raising families. There’s nothing like that at Camp Half-Blood. I kept thinking about you and me…and maybe someday when this war with the giants is over…”
It was hard to tell in the golden light, but he thought Annabeth was blushing. “Oh,” she said…
“I’m sorry,” he said. “I just…I had to think of that to keep going. To give me hope. Forget I mentioned—”
“No!” she said. “Gods, Percy, that’s so sweet.

Romantic Quotes And Sayings by Rick Riordan, The Mark of Athena