One possible secret could be about his past relationship with Lily Potter. Maybe he reveals how much Lily meant to him and the complex feelings he had towards her, which in turn influenced his actions throughout the series. Another secret could be related to certain spells or potions that he has discovered but kept hidden from others in the wizarding world.
Hermione would likely become more empathetic towards Snape. Knowing his secrets would make her see him in a new light, not just as the strict and often - disliked professor. She might start to understand the reasons behind his actions and his prickly attitude.
One possible plot twist could be that Snape reveals a long - hidden connection between Hermione and his own past. Maybe he knew her parents in a way she never expected. Another could be that he shares a secret about the Dark Arts that Hermione uses to turn the tide in a major battle against Voldemort. For example, he might disclose a weakness in a powerful dark spell that only he knew because of his past as a Death Eater and double agent.
The relationship could become very complex. Hermione might feel burdened by the secrets. She has to keep them from her friends, which could cause strain. On the other hand, Snape might start to rely on Hermione more, seeing her as someone who can understand his motives. This new dynamic could create a lot of internal conflict for both of them, as they navigate between their old roles and the new relationship based on shared secrets.
Hermione could share her insecurities with Snape. She might tell him about how she sometimes feels pressured to always be the smartest and the most knowledgeable. Also, she could reveal her fears regarding the safety of her friends during the wizarding wars.
The secrets could create a bond of trust between them. If Hermione shares her fears, Snape might offer his protection or advice. This would make their relationship more complex and deeper than just a student - teacher one in the fanfiction world.
Perhaps a scene where Hermione confronts Snape about his treatment of her friends. In the fanfiction, she could gather evidence of how Snape has been singling out Harry or Ron, and then she barges into his office. She would start off calmly, but as Snape tries to dismiss her, she gets more and more passionate, really telling him off for his behavior.
In the fanfiction, Snape may protect Hermione by shielding her from the Dark Lord's influence. Given his double - agent status, he would be in a position to know if Voldemort has any plans involving Hermione. He could then take steps to keep her out of Voldemort's sight, perhaps by misdirecting Death Eaters or using his own magic to create a protective barrier around her when she's in danger.
Hermione's character development in these fanfictions can be complex. When she tells Snape off, she may face consequences that force her to grow in different ways. For instance, Snape could try to retaliate by making her academic life difficult. This would make her learn how to deal with adversity and still stay true to her principles. She might also start to question some of the school's rules and traditions, as she realizes that someone in a position of authority like Snape can misuse them. This leads to her becoming more of a rebel and a reformer within the Hogwarts community, which is a significant development from her initially rule - abiding self.
Well, Snape is a rather strict and no - nonsense teacher. He might be initially shocked or appalled. He could give Hermione a stern lecture about focusing on proper academic work instead of fanfiction. Maybe he'd even deduct house points if he thought it was a waste of her time or inappropriate.