Most mortals aren't supposed know the truth anyway. There are a few with Clear Sight that can see through the Mist, but most will never know.

[ a shrug. he figures this magnus person is his husband now. nico can't think of any reason why someone would willingly plunge into a place like tartarus except out of love. after all, that's what he did. ]

Magnus... is your husband? It's good that you saved him. I couldn't save the one I loved. He was able to save himself, though. And, well, his girlfriend. The girl he loves more than anything.

[ and that pretty much explains why percy isn't the right person. ]