It could be that Ginny uses a dark magic spell in a moment of anger or recklessness. Harry, being the defender of the light, punishes her by making her study the history of the harm caused by dark magic. As she delves into this study, she realizes the error of her ways and has to work hard to regain Harry's trust. This could involve her doing community service within the wizarding community related to those who have been affected by dark magic.
I'm not sure of specific 'Harry Punishes Ginny' fanfics. You can try searching on popular fanfic websites like Fanfiction.net or Archive of Our Own. Just use the keywords in their search bars to see if any relevant stories pop up.
In some fanfics, Snape might punish Harry because of his perceived insolence in class. Harry has a rebellious streak, and Snape, being strict, wouldn't tolerate any behavior that he deems disrespectful to his authority as a teacher.
In some fanfictions, Snape might punish Ginny for misbehaving in Potions class. For example, she could be given detention for accidentally causing an explosion during a brewing experiment.
At first, Harry is likely to be angry. He might feel that Snape is being unfair and targeting him. Harry has a strong sense of justice, and when he believes he's being wrongly punished, he'll be resentful.
Hermione is often a well - liked character in these fanfics. She can act as Ginny's confidante, giving her advice on her relationship with Harry. Also, her intelligence and resourcefulness can play a part in helping the couple out in various situations.
One possible reason could be that Harry is too focused on his fight against Voldemort and doesn't want to put Ginny in danger. He might think that being with her would make her a target for his enemies.
Yes, there are plenty of positive and family - friendly 'Harry Potter' fanfics about Harry and Ginny. For example, some might focus on their adventures together after the main series, like exploring new magical places or raising their family. These fanfics are in line with the overall positive spirit of the 'Harry Potter' universe.