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Summary
Team 7 didn't make it in their fight against Kaguya in different dimensions. So the Sage of Six Paths grants reanimated Hokage a chance of fixing it all before it started, but only one can go. They chose Tobirama Senju because he knows Uchiha better than anyone else and has the best chakra control over all of them.
When he woke up in his 9 year old body next to his long dead twin, Tobirama swore he'd prevent Kaguya from coming back. And for that he must watch Madara closely in order to catch Black Zetsu and deal with the source of the disaster himself.
And what's the best way to closely watch someone from their enemy clan if not marrying them?
or
Time travel Tobirama AU, where Tobirama decides to marry Madara to prevent The Fourth Shinobi war.