Well, it might lead to Harry having to isolate himself. If the pain is severe and constant, he may not be able to function normally in his daily life at Hogwarts or in the wizarding world. He could also become a target for those who want to use his pain for their own gain. For example, someone might try to blackmail him or use his vulnerability to get access to secrets he knows. And if the scar hurting is a sign of a new threat, it could put all his friends and the entire wizarding world in danger again.
Well, he might become more cunning and calculating. Maybe he starts to use more devious means to achieve his goals, like Scar from 'The Lion King' who was always plotting. He could also become more self - centered and less concerned about the well - being of others around him.
In some fanfictions, Harry's scar might hurt because of dark magic remnants. Maybe there are leftover spells from Voldemort that still linger and cause pain. It could also be a sign of a new threat emerging, like a hidden follower of Voldemort trying to use dark magic in a new way that affects Harry through his scar.
Maybe Harry accidentally cast a spell on Hermione during a training session that caused her some harm. So he feels guilty because he didn't mean to hurt his friend.
In a fanfic, the lightning scar could be a portal. Harry discovers that when he concentrates hard enough and uses a special incantation, he can use the scar to travel to different times in the wizarding history related to Voldemort. He uses this ability to learn more about his enemy, but also risks changing the past and the future of the wizarding world.
Perhaps Harry would try to take over Hogwarts in a more forceful and underhanded way. He might try to oust Dumbledore or other authority figures, using his new - found 'Scar - like' traits. He could also form an unlikely alliance with some of the dark wizards or creatures, thinking that they can help him achieve his power - hungry goals. For example, he might team up with some of the Death Eaters who are still lurking around, which would be a huge shock to the wizarding world.
Another plotline might be that the lightning scar becomes a target for a powerful dark wizard who wants to steal its power. This wizard believes that the scar holds the essence of Voldemort's power and if he can extract it, he can become the most powerful wizard. Harry has to protect his scar while also trying to find a way to permanently remove the threat of this power - hungry wizard. He might seek the help of old and new allies, and along the way, discover new things about his own connection to the scar and the magic within it.
Snape could be distracted by his own dark thoughts or memories. For example, if something reminded him of his past with James Potter, his hatred for Harry's father might cloud his judgment for a moment and cause him to accidentally cast a spell in Harry's direction.
Fanfictions can vary greatly in their content and quality. Regarding one about Ginny hurting Harry and Harry losing his virginity, it might be a very niche or even a non - canon - compliant exploration. Maybe it's created by an author who wants to show a different side of the relationship between Ginny and Harry, perhaps in a more complex or controversial way. But without actually reading it, it's hard to say exactly what it contains.
Hermione might be the one. With her extensive research skills and vast knowledge of magic, she could have stumbled upon a way to remove the scar. She was always determined to help Harry, and this would be just another of her great contributions.