Fedex

Fedex is the slash ship between Fitz Vacker and Dex Dizznee from the Keeper of the Lost Cities fandom.

Canon
In the first book, Keeper of the Lost Cities, Fitz and Dex see each other at lunch. Dex says that he knows Fitz but Fitz doesn't seem to know Dex all that well. Fitz calls Dex 'Deck', and Dex calls Fitz 'Wonderboy'. After Fitz leaves, Dex grumbles about Sophie liking Fitz.

On page 161 of book 2, Exile, Dex grumbles to Sophie about how she spends so much time with "Wonderboy". This could be due to jealousy.

Keeper of the Lost Cities: Neverseen

 * Fitz flexed his muscles in Dex's presence.
 * Dex walks towards the Uffizi and Fitz grabs his arm.
 * Fitz spins an obscurer 'probably to annoy Dex'.
 * Fitz's hair was dyed green by Dex against his will.
 * Dex shows distaste over Sophitz by making gagging sounds.
 * Dex beats Sophie to the injured Fitz when he's impaled by the arthropleura.
 * When Dex sees Fitz unconscious, he says, "I killed Wonderboy" as if he truly regretted hurting him.
 * Dex admits to Sophie that he also thinks that Fitz is perfect. " '...And he's just so perfect.' Dex sighed."
 * Dex goes into Fitz's room to apologize and make up after Fitz is stabbed by the arthropleura.
 * Dex admits that he apologized to Fitz for 'hating' him so much.
 * Dex says that Fitz is 'not a bad guy'.
 * After Dex apologizes for hating him, Dex says that Fitz "...looked like he wanted to hug it out..."

When Fitz is talking about Alvar in Lodestar, he says "No one forced him to do what he's doing," Dex is gentle with him and comforts him by quietly saying, "I know you're mad, but...he's still your brother." Later in the book, Biana tells Sophie and Dex that she gave Fitz and Keefe a makeover, Dex says that he wants to hear the story along with Sophie. At a sleepover, Dex sleeps between Biana and Fitz and doesn't complain.

Dex and Fitz have each other's Imparter contacts. This is proven when Fitz calls Dex to check whether Dex's Imparter is the problem in Lodestar. When Fitz reveals that he's sixteen, Dex "mumbled something about Fitz being super old". He is also very shocked when Fitz said that he already finished his matchmaking packet.