This was a more challenging request than I had anticipated!
I’m guessing you’ve tried on http://deancastiel.livejournal.com/? More specifically, they have word count tags for fics 10k – 20k and 20k+ which are great when searching for longer Dean/Castiel fic (although I’m afraid it still requires a manual trawl through to find ones without a Sam pairing).
For Dean/Gabriel with no Sam pairing:
‘Poetic Justice’ by Tiptoe39: http://tiptoe39.livejournal.com/tag/poetic%20justice (c.17k words)
Menel has a series that consists so far of ‘Blood, Sex and Magick’ and ‘Jailbreak Blues’: http://deangabriel.livejournal.com/tag/author%3A%20menel (total c.27k words) (The link goes to her author tag on the deangabriel community: her lj is f-locked, so I must confess I don’t know if this is where the series stopped or if she ever wrote any more?).
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I’m guessing you’ve tried on http://deancastiel.livejournal.com/? More specifically, they have word count tags for fics 10k – 20k and 20k+ which are great when searching for longer Dean/Castiel fic (although I’m afraid it still requires a manual trawl through to find ones without a Sam pairing).
For Dean/Gabriel with no Sam pairing:
‘Poetic Justice’ by Tiptoe39:
http://tiptoe39.livejournal.com/tag/poetic%20justice (c.17k words)
Menel has a series that consists so far of ‘Blood, Sex and Magick’ and ‘Jailbreak Blues’:
http://deangabriel.livejournal.com/tag/author%3A%20menel (total c.27k words)
(The link goes to her author tag on the deangabriel community: her lj is f-locked, so I must confess I don’t know if this is where the series stopped or if she ever wrote any more?).
I hope that helps!