Perhaps he tries to convince her. Harry is a determined person. He might think that Hermione just needs more time or that he didn't present his case well enough. So, he could start listing all the reasons why they would be good together, from their shared history to their mutual understanding of the wizarding world. But if Hermione remains firm in her decision, he may finally have to accept the rejection and move on.
He might be initially heartbroken. Harry has deep feelings for Hermione, so the rejection could come as a shock. He could withdraw into himself for a while, feeling sad and confused about why she doesn't feel the same way.
In the fanfic, Harry could have a range of reactions. At first, he might be in denial, thinking that Hermione is just joking or that she will change her mind. Then, when he realizes it's for real, he could get angry, feeling like he's been unfairly judged or rejected. However, over time, he may come to accept it and focus on other aspects of his life, like his fight against the dark forces or his relationships with other friends.
Natsu might be initially shocked and sad. He could go off on his own for a while to think about what happened. Since he's a passionate person, the rejection would hit him hard.
She could be rejecting Harry's proposal because she's still dealing with past traumas or unresolved issues. For example, she might be worried about how the public would view their relationship, especially given Harry's status as 'the boy who lived'. She also might not be ready for such a big commitment due to the instability in the wizarding world at that time. There could be a lot of political and social unrest, and she might feel that getting engaged is not a priority in such a situation.
Well, it could lead to Harry feeling a bit heartbroken at first. But then he might focus more on his fight against the dark forces. He realizes that their friendship is more important than a romantic relationship that wasn't meant to be.
Alternatively, Ginny could be very mature about it. She might respect Harry's decision, even though it hurts. She could choose to step back and give Harry the space he seems to need while secretly hoping that he will change his mind in the future.
Sometimes, Harry might use the rejection as motivation. He could focus more on his training or other important tasks at hand, like fighting against the Dark forces. He realizes that he has bigger things to worry about than a failed romantic pursuit, and this rejection could fuel his determination to prove himself.
At first, Harry would be confused. He has always seen Snape as a complex figure, and the idea of being rejected as a son would be a shock. He might start to question his own self - worth, thinking that if Snape doesn't want him, there must be something wrong with him. As time passes, he could grow bitter towards Snape, but also use this as motivation to become stronger. He might focus on his friends and the positive relationships in his life, trying to move on from Snape's rejection while still carrying the pain deep inside.
He might be initially in shock. Harry could stand there, unable to believe what has just happened. Then he might become angry, lashing out at his mate or the situation in general. He could say things he doesn't really mean in the heat of the moment.
Harry might be extremely hurt. He could initially feel a sense of shock and disbelief. After all, he may have started to develop some feelings of trust or kinship towards Severus. Then, he might turn to anger. Anger at being rejected, especially if he doesn't understand the reasons behind it. He could also feel a sense of loss, as if he has been deprived of a chance at a real family connection.