Here’s links to all the fics that I’ve found that feature primarily interactions between Castiel (Supernatural), and Captain Jack Harkness (Doctor Who and Torchwood). I have a few stories in here as well (I’m Cuda). But basically, this is why I ‘ship this ‘ship, and there’s some brilliant gen as well as some fun (and some not so fun) romance.
If you have more stuff with Castiel and Jack interaction as the main focus, send a link my way! I’d love to read more and also update this list.
Genfic
A Personal Angel of Death – Written by Ashes
Warning – mentions of character deaths
Inappropriate Conduct – Written by Cuda
Pre-slash
Recklessness and Water – Written by MoragMacPherson
Slashfic
4173 – Written by janto321 (explicit)
A Moment’s Touch – Written by janto321 (explicit)
A Profound Bond – Written by Jadeykins (explicit)
AU, also includes Dean/Jack, Dean/Castiel, and Castiel/Dean/Jack.Bedroom Hymns – Written by Xenoamorist (explicit)
Christmas Eve 1945 – Written by janto321 (explicit)
Dejame sin aliento – Written by PhoenixSideros
Written in Spanish, also includes Dean/Jack.Fair Fight – Written by Cuda
Ghosts That We Knew – Written by janto321
Grace – Written by Cuda (unfinished, explicit)
Midnight Rodeo – Written by janto321 (explicit)
AU, rodeo-based human universeOf Beginnings and Endings – Written by MoracMacPherson
Warning – mentions of character deathsPlay It Again, Jack – Written by Cuda
Warning – mentions of character deathsSave A Bull, Ride A Cowboy – Written by janto321 (explicit)
AU, rodeo-based human universe, also includes Jack/Sam, Castiel/Dean and Jack/Sam/Castiel.The Splendor of Light – Written by Skidmo
The Tale of the Amorous Vestments or Coat Porn – Written by Synesthete314
That Which Moves in the Dark – Written by Schizzar (explicit)
Also includes Dean/Owen and Sam/Ianto.This Is My Stop – Written by Cuda
Timey-Wimey Voodoo Swing – Written by Cuda
Untitled – Written by tiptoe39
Valentine’s Vignettes – Written by janto321 (explicit)
If anyone is looking for superwood Jack/Cas fics, here you go 😀