Enemies? (aka the Grandson of ol' Voldy, PJO and HP crossover)

Gaea has been defeated, Leo has returned with Calypso, and everyone is enjoying their time chillin' and... well, chillin' some more! Apart from the odd monster, everything is at peace. Man, this is the life. Percy has some BIG plans for Annabeth, and they cannot be thrown away! Taking advantage of this peace, Percy is...