Do you remember when Percy, Annabeth and Grover were playing hackey sack with an apple. Throwing an apple to a girl in Greece is a proposal. At some point in the game percy would have passed the apple to Annabeth which means they've been engaged since they were 12.

A/N: EEEEEEEEEEEEEEEEEEEEEKKKKKKKKKKK!!!!!!!!!!!!!!!!!!!!! *fangirls* *dies* so cute! PERCABETH!!!!!!!!!!!!!