You and Grover were tasked with protecting Percy before he arrived at Camp Half-Blood.

After Percy killed the minotaur and fainted, they took him to the Camp infirmary where when he woke up he went to Mr. D's office.

Mr. D used the lie that he was Percy's father to get him a bottle and you were holding back your laughter until Mr. Chiron arrived to deny that.

"Did you know he was lying to me?" Percy asked you with some indignation.