Stop and Stare

"Percy's been to health class. He knows all about it. He knows that he's supposed to wait until he's married. He gets it. He knows." Percy has to deal with the consequences of sleeping with his best friend, who also happens to be a grey-eyed daughter of Athena. Or in which Percy and Annabeth have a night together in BotL, and now have to deal with the aftermath of their decision.