Dead Reckoning

1 year out of purgatory Dean finds out he's dying. The brothers are broken by childhood trauma & betrayal. Benny offers a solution but Dean goes off to die after Sam rejects him physically & emotionally. Sam must face his failings as a brother, race the clock to save Dean & find the courage to accept him & their forbidden love. First time Wincest, Sick!Dean, Damaged!Sam, Benny/Dean