What happens once Leo and Calypso leave Ogygia? They go back to camp!
Leo expects everything to go back to normal. His friends will stay the same and forget that he had 'died', his half-siblings would be as crazy and creative as ever, he would continue to be the cabin counselor and he would have Calypso. The only exception for everything going back to normal.
Calypso doesn't know what to expect. She's living in the modern world now. There is technology she doesn't know about, new style of clothing and plus now she's mortal (besides the fact that her father is a Titan), she can now age, she can stay with Leo forever.
Is everything how they think it's going to be? Or are somethings going to have to change in order to have them at camp?