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Written for the 2012 Snarry-A-Thon at Snape_Potter community.
Prompt: 119: Harry and Severus are in an established relationship when an accident sends Harry to the past during the time of the Marauders. Unable to resist helping a teenage Severus, Harry helps him reconcile with Lily. When he suddenly returns to his own time, he finds out that Severus is now his father.