Caspian/Edmund: That's The Deal

Title: That's The Deal
Character(s)/POV: Caspian X
Pairing: Caspian X/Edmund Pevensie
Rating: T
Notes: A blend of film- and book-verse elements.  I’m thinking in terms of film-verse casting, and (to an extent) setting, but dating things according to this timeline.  This is set roughly a week after Ramandu’s Island, during Voyage of the Dawn Treader.  The text of the cut is a line from the film Shadowlands, and the title/summary are adapted from it.
Disclaimer: Characters you recognise belong to C. S. Lewis.
Summary: Joy now, pain later; that's the deal.

( The pain now is part of the happiness then. That's the deal. )