One possible reason could be that she might think Harry is putting himself in unnecessary danger, like when he goes off on his own to face Voldemort without a proper plan. Molly is very protective, and she may feel frustrated with Harry's recklessness.
One common theme could be conflict. Since Molly is hitting Harry, there might be some sort of disagreement or misunderstanding between them that needs to be resolved.
The 'Harry Potter' books are set in a magical world full of its own stories, prophecies, and secrets. Sirius is a complex character with a lot on his plate. He has to deal with his family history, his time in Azkaban, and his loyalty to his friends. Fanfiction is a form of creative writing by fans outside the original story. Sirius doesn't have the time or the inclination within the context of the story to be reading fanfiction. His life is too filled with real magical drama and danger.
Well,'molly bashing' in Harry Potter fanfiction is the phenomenon where Molly Weasley is not depicted favorably. Some fans might feel that in the official story, Molly has some traits that they want to explore more critically in their fan - created stories. For example, her role in the relationship between Ron and Hermione or her influence on the Gryffindor students. By bashing her in fanfiction, they can rewrite scenarios and relationships in a way that suits their own creative vision, even if it means making Molly look bad.
One great Molly Weasley fanfiction is 'Molly's Moments'. It shows her behind - the - scenes efforts in taking care of the Order of the Phoenix members at the Burrow. Another is 'Molly's Motherly Love' which delves deep into her relationship with each of her children, especially during the tough times of the wizarding war. There's also 'Molly's Magic' that focuses on her underrated magical abilities.
It could be that Molly crossed a line with Harry, and he felt that a howler was the only way to get his point across and make her understand his perspective. Maybe it was a big misunderstanding or a serious rule violation on Molly's part that triggered Harry's reaction.
There may be many 'molly hits harry fanfic' out there. One way to find them is to join relevant fan communities. For example, on Reddit, there are often groups dedicated to specific fandoms. You can ask the members there if they know of any good 'molly hits harry fanfic'.
The relationship could start with mutual respect. Harry has always respected Molly as a mother figure in the Weasley family. This could gradually turn into something more romantic as they share more personal experiences. For example, Harry might confide in Molly about his post - war traumas, and Molly's understanding and care could lead to deeper feelings.