Find Me in the Ashes (слэш)

This, this is what he has always been afraid of, since the day Jim said those first words to him on the shuttle, since the moment he well and truly realized he was in love with his best friend. Because he gave his heart and soul to Jim, and now Jim has taken them with him somewhere Leonard can’t follow, and he doesn’t think he can survive the pain of it. Even in his darkest nightmares he could never imagine something like this. He can’t breathe, can’t think, can’t hold himself together in the wake of the end of the world.
 
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Leonard can't imagine anything more painful than losing his soulmate. Until he gets him back.