Bottom!Castiel only - wincestiel without wincest, and sam/castiel h/c
1. Wincestiel without wincest, No AU
It should be nc-17. It doesn't matter whether porn with plot or without plot.
2. Sastiel hurt/comfort, No AU
I love Sam>Cas>Dean>Sam triangle.(No wincest, of course)
Sam wants Cas, but he knows Cas only loves Dean.
So he was already giving up, however, something happens(For example, Dean said yes to Michael, or blah blah blah) and they are left alone.
Cas is frustrated and Sam takes care of him.
And Their relationship starts to change.
I would like nc-17 but PG is also ok.
Really loved fossarian's Deep In.