Sasuke and Naruto grew up in different house holds until, Naruto was adopted by Iruka, which was good maybe more then good friends with kakashi who is also great friends with itachi.
Itachi is the older brother and legal guardian of sasuke uchiha.
These two boys grew up together in a forced manner by their legal guardians. They fought and bickerd at first, but slowly got along, they trusted each other with their secrets until, Naruto made friends, Naruto was always a sunshine and would be social, while sasuke didn't like to social unless he had to, he wasn't shy he just prefers not to. From this they slowly went their different ways in school, Naruto only spoked too sasuke or at least tried to when their legal guardians wound spend time together. Sasuke was one more quiet to Naruto since he felt Naruto betrayed him and replaced him with Shikamaru.
Sasuke started to ditch those days where they were planned to all hang out with their families, and Naruto too, building a small grudge against each other, until they were forced to talk again.
NOT my characters, NOT MY ART, none is my art, it's all found on Pinterest, just my plot and awful writing is mine :p