Naruto nidaime hokage's apprentice

What if Tobirama survived the encounter with gold and silver brothers and went back to Konoha but decided to let the generation of Hiruzen to lead and lived in a cave in the forest of death where he has been since his return he was just waiting for the inevitable death for many years.

Decades pass since then, he senses a chakra signature so large like his sister in law near him he then look for the chakra signature and saw a blonde boy shaking in fear and was out of breath

What if Tobirama decided to take the blonde boy as his apprentice and teach the boy every jutsu that he created even the forbidden one's

what if because of this Naruto graduate on his first attempt.

I don't own Naruto as it belongs to Masashi Kishimoto