So Itachi goes in search of one, and finds a perfect mate for his brother.
How would you feel seeing the one you love propose to someone else? Walking home from school one day, you see a man threatening a child with a gun.
Reading Sasuke x Naruto fanfiction can be interesting because it allows us to explore aspects of characters that were not addressed by the original story.
OR: The one where Yamato gets his own rather unique genin team comprised of a ghost, a god, and an assassin, and the timeline will never be the same.