1.

Naruto is an average person; taciturn, organized and works at a public Middle School. However, his life is consumed by a five-year-old who happens to be his son: Uzumaki Menma, whose only wish, ever since his brain allowed him to remember, has been meeting his unknown papa.

Or,

Sasuke, the pride of the Uchiha family, is an internationally recognized model. Nevertheless, his fate is twisted when he receives a call from a child who claims to be his.