I've only read fic in the Angel and Supernatural fandoms. In Angel there wasn't a sibling or even family really to ship. So Supernatural is where I first encountered the sibling love. I avoided the Sam/Dean stuff initially but my quest for good fic led me there. There are some amazing writers in the Supernatural fandom and many write Sam/Dean.
Almost all the incest fic I wrote was in AtS. Usually, which is to say always, Connor was involved.
Signed, wrote Connor/Darla and Connor/Jasmine.
Castiel chibi (scroll down): [link]
Dean, Cas and pie, animated: [link]
He ate pie and hearts came out his ass! Awwwwww!
I don't recall if the "Deano" question was ever settled, but Jo calls him that in "No Exit" when posing as his girlfriend to rent the apartment. Ellen, still so hot. And heartbreaking to see her saying she's lost enough, and won't lose Jo, too, and the foundation for her going out with her daughter was laid.
*cries*
Here is the baby!Cas. I link because it came up. Also, the visual is too adorable.
Signed, wrote Connor/Darla and Connor/Jasmine.
Based on some of the 4th season episodes, I'm not entirely confident the latter wasn't happening offscreen.
Okay, so peculiar Bones/SPN crossover crack. Which I think I'm actually recommending, unlike the age-regressed Cas.
I
think.
Maybe I have a thing for tech-obsessed Cas. Okay, definitely.
I'm dying over here! Now I want to read Cas' porn.
The mending fic I linked had a lot of problems, most notably the timeline in relation to the personalities. Yeah, I couldn't quite get behind Castiel's sense of humour and laughter, but was absolutely haunted by Dean's reaction to the whole thing. Maybe if it had been an AU pre-The End, maybe.