Harry could also feel a sense of betrayal, especially if he thought Snape was on his side to some extent before. This feeling of betrayal might fuel his determination to resist. He might call out for help from his friends or any allies he has in the wizarding world. And depending on how long he is held by Snape, his reaction could evolve from pure anger and resistance to a more strategic approach of trying to understand Snape's endgame.
Snape might be annoyed at first. He's not exactly the warm - and - fuzzy type, and having a kitten - Harry around could disrupt his usual routine.
Snape would likely be initially suspicious. He's not used to Harry coming to him for help or sharing secrets. But once he realizes the seriousness of what Harry is saying, he might start to see Harry in a new light. He could be grudgingly helpful, still maintaining his cold exterior but secretly starting to feel a bit more protective of Harry.
Initially, the relationship is one of captor and captive. Snape is in control and Harry is the unwilling victim. But as the story unfolds, Harry might begin to question Snape's motives. Snape, in turn, might start to open up a bit about his reasons for taking Harry. This could lead to a slow transformation of their relationship. They might find common ground in their shared experiences, such as both having lost people they loved to Voldemort. This newfound connection could start to heal the rift between them.
Snape might also keep what he saw to himself at first. Instead of immediately confronting them, he could choose to observe them further. He might be curious about what they were really up to and use his skills as a spy to find out more. This way, he could gather more information before deciding on the best course of action, whether it be punishment or something else entirely.
Snape might initially be suspicious. He has always had a distrust of Harry, so he could think it's some sort of trick. But then, as a Potions master and a teacher, he might also feel a sense of responsibility and try to help.
Perhaps the plot is centered around Snape having some sort of misinformation. He takes Harry by force because he thinks Harry is in danger and he needs to protect him in his own way, which is rather forceful. This could lead to a lot of conflict between Harry and Snape initially, but then they might come to understand each other's motives as the story progresses.
Harry would probably be very confused at first. He's so used to Snape's animosity towards him that when Snape forgets who he is, it would be a complete shock. He might also be a bit suspicious, thinking it's some sort of trick. But as time goes on, he could start to feel a bit of pity for Snape, especially if Snape seems lost or confused without his memories of Harry.
He could also be secretly amused. Despite his stern exterior, Snape might see a bit of his own unrequited love in their relationship. So, he might give them a stern warning but not be as severe as he usually is.
Snape's reaction could also be one of extreme caution. He would be constantly on guard, worried that Harry might discover some of his secrets or that Voldemort's supporters might target Harry while he's in his care. So he would be very vigilant, but this might also lead to some over - the - top reactions when Harry does something even slightly out of the ordinary. However, over time, this vigilance could turn into a form of care as he gets used to Harry being around.
Harry could react with anger. He is a strong - willed character. So, he might confront Snape about his hatred. He would demand to know why Snape is treating him this way when they should have a father - son relationship. This could lead to a series of intense arguments between them.