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Oh. My. Gods. The parallel hereee maybe im going crazy but humor me
In the last olympian the last line of chapter 22 is "it was pretty much the best underwater kiss of all time"
And in the chalice of the gods the chapter name of chapter 35 is "pretty much the best goodnight kiss of all time"
Since an underwater kiss is smth not normal ppl can do (sadly) it tells us that percy jackson will still not have a 'normal' life but since this was the last line it tells us that it's the end of an era (the pjo series)
A goodnight kiss is seemingly normal and it being used in a chapter title signifies that it is not the end and this time it's for more personal and normal stuff
Maybe im reading to much into this , maybe im just stating the obvious and i know that rick is going to write 2 more books but i just had to get it out of my mind