No. The official Boruto series is focused on the growth of Boruto, his friends, and the new generation in the ninja world. Fanfics are often creative interpretations by fans, but this one sounds like it's not in the spirit of the official series at all. It's likely a non - official and inappropriate creation that has no place in the official Boruto story.
Yes, there are likely fanfics out there involving Naruko and Boruto. You can check fanfic platforms like FanFiction.net or Archive of Our Own. However, the specific combination might not be as common as some other pairings in the Naruto/Boruto fandom.
One great idea for a Boruto and Himawari fanfic is a story where they go on a journey outside the village. They might encounter new types of ninjas or strange creatures. Himawari could be the one to sense danger with her Byakugan first, and Boruto would be ready to fight. It would show their growth as ninjas and also their bond as siblings.
Boruto could be developed by showing his growth in responsibility. For example, in the fanfic, he could take on the task of teaching Himawari a new jutsu. This would not only show his skills but also his patience. Himawari, on the other hand, could be developed by showing her becoming more independent. Maybe she decides to go on a small mission on her own to prove herself to Boruto.
One idea could be exploring a different path for Boruto where he doesn't inherit the power of the Jougan. Maybe he focuses more on his own unique ninja skills that he develops through intense training with his friends. For example, he could create a new type of jutsu by combining the elements in an unexpected way.
In some fanfics, Boruto might be depicted as hating Naruto because of the lack of attention he gets from his father. Naruto is often busy with Hokage duties, leaving Boruto feeling neglected.
I'm not entirely sure what a 'boruto sakura cock fanfic' specifically is as it's not a mainstream or official Boruto or Sakura related concept. It might be some sort of fan - created, non - canon and potentially inappropriate fictional work. We should focus more on the official storylines and positive aspects of the Boruto and Naruto franchise.
Perhaps in the fanfic, Boruto and Himawari are involved in a festival in the village. They enter a contest together, like a ninja skills show - off. Boruto is a bit overconfident at first, but Himawari keeps him grounded. In the end, they learn more about each other and their combined strength as siblings.
Sarada could also be a main character. She is strong - willed and intelligent. She could be investigating a case of a missing - nin who is suspected of being involved in some sort of conspiracy against the Uchiha clan. This would give her a chance to show her detective skills and her loyalty to her clan.