Dating leo piper
Annabeth admits at sixteen that she had a crush on Percy since the age of twelve.Annabeth begins to show slight feelings for Percy (and vice-versa; though, more Percy is less than Annabeth- for now).Annabeth admits she does not know but would fight alongside Percy regardless as they were friends.
She hugged him when he changed back to human, cried on his shoulder while hugging him underwater (after he saved her from the Sirens).
At the end of the book, she kisses him on the cheek following their success at the chariot race.
Later, with the help of Ares, the three hop on a truck heading west and Annabeth and Percy talk about the possibility of war between the gods while Grover sleeps.
They briefly talk about their personal backgrounds (mainly of their god parents), and Percy asks her that if the gods do go to war, would Poseidon and Athena be on opposite sides like they were during the Trojan War.
Throughout both series, Percy Jackson and Annabeth Chase have shown many romantic feelings for each other, mainly in The Last Olympian and The Battle of the Labyrinth, though Annabeth shows it more than Percy, and Percy just thinks about it instead.