Desperately want Percy to accidentally let it slip that Sadie reminds him of what his and Annabeth’s daughter would be like, and Sadie teasingly calling Annabeth and Percy “mom” and “dad”.

Percy meeting Aphrodite in The Titan’s Curse:

“Pick the most beautiful actress you can think of. The goddess was ten times more beautiful than that. Pick your favorite hair color, eye color, whatever. The goddess had that. When she smiled at me, just for a moment she looked a little like Annabeth.”

In The Lost Hero we find out that Aphrodite morphs to look like your ideal of beautiful. Percy thought she looked like Annabeth.