The Uchiha Sister..
You may have heard of, Sasuke, and Itachi. The two brothers. But, have you heard of their sister? AyukI Uchiha. If, you've heard of Sasukes past you would know when, Itachi kills their own family, Sasuke at one point runs away, he was little don't judge him. Anyways, so there was another room in that house that no one has ever been too.
That's the parents room. In there lies a crib with a baby girl inside.. Sasuke may have not gotten the chance to take her with him. But later on in their life they see each other once again. Now, See how Sasuke, Naruto and, Sakura deal with this 15 year old..