I couldn't find a story that I read a year ago.It's on fanfiction.net. It was a self insert story. The self insert was born as Naruto's son and was the twin brother of Himawari. I don't remember it much but I can tell that in the end Himawari was kidnapped. The self insert also went to train with Sasuke along with Kakashi.
I couldn't recall the main characters name and the story name either. so it would be a great help if anyone can help me.