Fics like A Second Chance at Happiness? Maybe?

A stupidly curious Harry Potter accidentally ends up in the past ... right in front of Regulus Black. Deciding he might as well stop the world going to hell, a - slightly insane - Potter drags a bewildered Regulus with him. Between ending a war and accidentally saving the Blacks, the two quickly get close. Will they have a second chance at happiness? Maybe?

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