My favorite Sastiel author is posingasme and the series that is the one that sold me on the possibility of Sastiel at all was Too Much and Not Enough. (http://archiveofourown.org/series/202616)
If you are ok with A/B/O there's Janice Lester's Enlightenment (http://archiveofourown.org/works/652203), which has alpha!Jared and omega!Misha but it's kind of a trope inversion. She has a couple others that are Mishalecki that I like.
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If you are ok with A/B/O there's Janice Lester's Enlightenment (http://archiveofourown.org/works/652203), which has alpha!Jared and omega!Misha but it's kind of a trope inversion. She has a couple others that are Mishalecki that I like.