Tobirama was not born a Senju. He wasn't even born human. He was just a silver-coloured koi in the Senju Clan's ornamental fish pond. But a koi is just a fancy carp, and a carp that swims to the top of the waterfall becomes a dragon.
Discontinued. Reposted after deletion.
Reposting deleted fic. Discontinued.
Naruto's seal is weakened by loneliness, Kurama raises him. This changes things, just a little bit.