Bribri

“Annabeth's voice caught on the word friend. Percy was a lot more than that. Even boyfriend really didn't cover it. They'd been through so much together, at this point Percy was part of her--a sometimes annoying part, sure, but definitely a part she could not live without.”
― Rick Riordan, The House of Hades

“For a moment, Percy actually remembered what it was like to be happy. He had an amazing girlfriend. They could have a future together.”
― Rick Riordan, The House of Hades

“Very slowly, using only 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 at 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.
Annabeth threw her arms around him. “I love you!”
“Guys,” Hazel interrupted. She had a little smile on her face. “We need to hurry.”
― Rick Riordan, The Mark of Athena

“Before I could lose my courage, I said, "Don't I get a kiss for luck? It's kind of a tradition, right?"

I figured she would punch me. Instead, she drew her knife and stared at the army marching toward us. "Come back alive, Seaweed Brain. Then, we'll see.”
― Rick Riordan, The Last Olympian