General Search: Long slash fics with a happy ending

[t-mahariel.livejournal.com]

What I'm looking for:

*A fic over 15,000 words (if it's a bit under, that's fine). No maximum word count, bring on the epics if that's what you want to rec.

*An ultimately happy ending. No bittersweet or could be happy in the future if you squint, but actual happy ending for everybody. (Now, I don't mind angst or violence, just please no major character death).

*Destiel please =D (Destiel does not have to be a main pairing, but if Dean is involved in the fic at all, please be Destiel.) The only pairs I'd rather not see is Sastiel or Wincest (Wincestiel is not only fine, but loved) (Samifer and Sabriel are also well loved) honestly though, I'm mainly looking for slash, so feel free to rec something with a pairing that's not on this list.

Thanks in advance for any recs =D