Dean Winchester left Castiel Novak in pieces when he broke off their engagement 21 days before they were supposed to get married. Now, a year later, Castiel has put himself back together and is moving on with his life and he seems to be doing okay. Until Dean comes knocking on his door at ass-o'clock in the morning. Now Cas must come to terms with the mess of a man who broke his heart but somehow still... has it.
Dean and Castiel have been best friends for years. Still, nothing could prepare Dean for when Castiel announces that he's tired of waiting for a mate and wants to have a baby through artificial insemination. Dean chooses to set aside his personal feelings and be the supportive friend Cas needs. But things start to go awry at Cas's insemination party when Dean stumbles upon the donor sperm. He doesn't remember anything from that night but eight years later when Cas moves back to Chicago with his daughter, things slowly start to click into place and Dean realizes that the tie he thought he could never have with the man he loves may have been there all along.
Based on the film "The Switch."