Destiel Fanfic..
Author Castiel Novak has finally hit the big time, with a book based on his failed college relationship with a brilliant painter. He's put all his pain behind him, but at a book signing, he comes face to face with Dean Winchester for the first time in twelve years, and the reunion doesn't go like Cas hoped. Dean's a broken man, with a lot of scars and secrets, shoulders weighed down by his demons and self loathing.
Cas sees a second chance with the man he's never stopped loving, but Dean's moved on, and is about to get married. Sam launches a "brilliant" plan to reunite his brother and his best friend, but Cas is worried it will all blow up in their faces, and he'll go through the agony of losing Dean a second time
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https://archiveofourown.org/works/1085792