Serenity

“Once she was gone, I knelt next to Annabeth and felt her forehead. She was still burning up.
"You're cute when you're worried," she muttered. "Your eyebrows get all scrunched together."
"You are not going to die while I owe you a favor," I said. "Why did you take that knife?"
"You would've done the same for me."
It was true. I guess we both knew it. Still, I felt like somebody was poking my heart with a cold metal rod.”
― Rick Riordan, The Last Olympian

“Why can't you place a blessing like that on us?" I asked.

"It only works on wild animals."

"So it would only affect Percy," Annabeth reasoned.

"Hey!" I protested.”
― Rick Riordan, The Lightning Thief

“Monkey bar," Annabeth said. "I'm great at these." She leaped onto to the first rung and start swinging her way across. She was scared of tiny spiders, but not of plummeting to her death from a set of monkey bars. Go figure.”
― Rick Riordan, The Battle of the Labyrinth

“Percy: Don't I get a kiss for luck? It's kind of a tradition, right?
Annabeth: Come back alive, Seaweed Brain. Then we'll see.”
― Rick Riordan