The Gods Call Me And My Cousin

Percy and Jason have been summoned by the gods to take on another mission.
Though this time the mission is now more dangerous - they have to find Zeus's lightning bolt again which Percy is not happy about. And the worst part - that mountain happened to be Mount Everest, the tallest mountain in the world.
Jason might be the son of Zeus, the Lord of the Sky, but Percy doesn't belong in the open air, being the son of Poseidon the Lord of the Sea's.
Worse still - Annabeth is now four months pregnant.
If things went well, they would return as heroes again. If things went wrong...well, they'll be dead on Everest.