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Extended Summary:
Nightflash AU. After the death of their daughter, Blaine is despondent and unresponsive to therapy. Sebastian kills the villain who murdered her in revenge, but Blaine suffers a complete mental breakdown. Sebastian tries to have Blaine institutionalized after realizing he's become a danger to himself and others, but Blaine escapes and becomes a supervillain and Sebastian's archnemesis. Eventually, Sebastian apprehends Blaine and convinces him that he can go back in time to save their daughter and, hopefully, each other.