If you don't mind self-recs, here's one for your request Nº2:

Meet You in Idaho
Even if Castiel can’t live in the bunker as long as Ezekiel is healing Sam, it doesn’t mean that Dean can’t stay in touch with the fallen angel. So staying in touch with Cas is exactly what Dean does. In more ways than he originally expected.
This goes AU after the events of Heaven Can't Wait. The differences from canon are practically nonexistent at first but they will be very major in later chapters.
(In this fic, Ezekiel is really Ezekiel and he plays a fairly big part in the whole scheme, although he only appears halfway through the 93 K story).
http://archiveofourown.org/works/1051339