Harry would probably be very suspicious. He has always seen Draco as a bit of a bully and an enemy. He might think that Draco is up to something and try to warn Hermione to be careful. Ron, being more hot - tempered, could be quite angry. He might not understand how Hermione could even be in a situation where Draco kisses her. He might even lash out at Draco without really thinking about it. Ginny, on the other hand, might be more open - minded. She could see that there might be more to the situation than meets the eye and encourage Hermione to figure out her feelings before making any rash decisions.
Hermione's parents, if they were to find out, would be extremely worried. They know the wizarding world can be dangerous, and Draco's family has a reputation that might not sit well with them. They would want to protect their daughter and might try to get her to come home. As for the other Gryffindor students, some would be supportive of Hermione, believing that she can handle herself and that she should follow her heart. But others would be more like Ron, thinking that Draco is bad news and that Hermione is making a mistake.
Harry would probably be very surprised and a bit concerned. He's always been protective of Hermione, and this sudden turn of events with Draco would make him wonder what's going on. Ron would likely be more openly shocked and perhaps a bit jealous. He has had his own complicated feelings for Hermione over the years.
Hermione could also be more understanding in some fanfictions. If she senses that there's something deeper behind Draco's actions, she might try to calm the situation down. She could ask him why he did it instead of immediately retaliating. Maybe she sees a glimmer of vulnerability in his eyes and decides to approach the situation in a more empathetic way. This could then lead to a conversation that changes their relationship for the better.
Hermione might initially be shocked and afraid, but she would quickly gather her wits. She would assess Draco, trying to figure out if there was any way to sway him to her side. Given her ability to see the good in people, she might try to appeal to any sense of morality Draco has left, all while secretly planning her escape or a way to undermine Voldemort's plan of using her as a pawn against the good side.
Hermione might be shocked at first. She has always seen Draco as an adversary, so a neck kiss from him would be completely unexpected. She could push him away immediately and demand an explanation.
Perhaps the kiss is a moment of impulse for Draco, who has been secretly attracted to Hermione's intelligence and courage all along. Hermione, on the other hand, is initially shocked but then realizes she has some feelings for Draco too. Their relationship could then develop as they try to find common ground between their different houses' values. They might start working together on a project in the library, away from the prying eyes of their classmates, and slowly build a deeper connection through their shared love for learning and magic.
Well, the other students in Gryffindor would likely be a bit taken aback at first. But then, knowing Hermione's intelligence and her tendency to be different, they would probably accept it. They might be curious about how she's going to manage to keep up the charade. The Hufflepuffs would be generally kind and understanding, perhaps even offering to help her if she needs it. The Ravenclaws would be intrigued by the idea and might study her transformation from a more academic perspective. The Slytherins, as a whole, would be more likely to try and use her disguise against her, either by blackmailing her or trying to expose her in a way that would cause her and her friends embarrassment.
Some characters like Hermione might be really surprised. She might raise her eyebrows and think it's quite out of the blue. Ron, on the other hand, would probably be more shocked and might even choke on his food if he was eating at that moment.
Another reaction could be confusion. Draco might not know how to feel. On one hand, he has his Slytherin pride and his clothes are part of that. But on the other hand, seeing Hermione in his clothes gives him a strange feeling in his stomach. He might end up being more curious about Hermione and her reasons for wearing his clothes.
Hermione could also be very hurt. Her hair is part of her identity, and having Draco, who she already has a strained relationship with, do something so cruel would cut deep. She might go to her friends, Harry and Ron, for support. They would likely be just as angry as she is and plot some sort of revenge against Draco and his Slytherin friends.
Hermione's friends from Gryffindor would be a mix of disbelief and concern. Neville, for example, would be worried that Draco might be using Hermione in some way. Luna would be more accepting, seeing it as a unique and interesting relationship that defies the norms of the wizarding world. As for Draco's friends from Slytherin, they would also be shocked. Some might see it as a betrayal of Slytherin values, while others might be intrigued by the power dynamics at play between a Muggle - born witch and a pure - blood wizard.