We Fell Asleep To Neverminds

He isn't sure how to help, but he needs to. He has this innate protectiveness over Annabeth, and he often wonders what exactly he needs to protect her from. The world, maybe, and sometimes even himself. Annabeth's too good and too fragile for anyone to contaminate her. OR - Annabeth's sad, and Percy says 'nevermind' a lot. AU.