Percy moved his hands through his hair, knowing this situation would turn Critical.
He couldn't admit he liked her. Not to anyone, not to anybody. He was afraid to, yet he couldn't back away.
He heard soft piano coming from the Apollo cabin, following it slightly. One of the campers was playing a song he'd heard on the radio on his way back to camp from a 'mission.' It described how he was taking it with Annabeth. He had to tell her how he felt, and quick.
Before she returned to go live with her dad for good.