Wings Tainted White -A Naruto Fanfiction-

This is a not so usual story, about a 900 year old demon named Kiyoshi. for the past 50 or so years he's been living in Konoha, being shunned and verbally abused by the people who lived and worked there. Kiyoshi payed them no mind for he had a friend, Hiruzen, the Third Hokage. The two have been there since The Third first became the hokage. Now after practically 50 years of friendship Hiruzen asked Kiyoshi to do something for him.
Watch over two young boys in the academy and keep them safe. Kiyoshi takes the job even though he hates children and is in for a big surprise when he finds out that the two boys are practically polar opposites.
What would you do if you have to take a role in life that you've never had to before. The role of a guardian was something Kiyoshi had no knowledge about, but he planed on winging it and letting the kids teach his as he goes.
"Which is truly tainted? An Angel who chose to kill or a demon who learned to love?"
DISCLAIMER: I DO NOT OWN NARUTO, BUT I DO OWN kiYOSHI OR ANY OTHER OC'S I ADD LATER ON