I was wondering if anyone knew of any good Dean/Castiel/Anna fics that are any or all of the following:

*Long, plotty and/or angsty.
*Explore all the possible relationships within the triangle, ie. contain Dean/Anna, Castiel/Anna and Dean/Castiel. Maybe even some Dean/Castiel/Anna threesome fic at some point.
*Preferably either end in Dean/Castiel or have no-one happy (absolutely not a deal-breaker, though - if someone knows a good one that doesn't end like this, feel free to rec anyway, please.)
*Not much fluff, but maybe a little bit.

Also, if anyone would like to recommend some angsty Dean/Castiel that deals with Castiel being conflicted about having feelings for Dean since the Bible says no homosexuality, that would be much appreciated as well.

Many thanks in advance.