What was the sweetest scene in the entire series for you?

Depends on what tu mean por sweetest? Do tu mean like touching.
Gosh there are so many.......<3

But anything that has to do with Itachi, the guy is a Legend.

naruto meeting hid dad.
...and then just punching him in the stomach :D

But actually that was a very heartwarming reunion. Finally naruto found out that there's a reason behind everything that has happened.