There's also a possibility that Hermione would be angry. She is a strong - willed character. If she felt that Draco was being inappropriate or trying to take advantage of her in some way, she would likely lash out at him, perhaps with a well - aimed hex or a scathing verbal rebuke.
She might also be conflicted. If there were some underlying feelings she had been suppressing towards Draco, the kiss could stir those up. She could stand there, frozen for a moment, not knowing how to react, her mind racing with a thousand thoughts about what this could mean for their relationship.
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.
In the fanfiction, Hermione's reaction would likely be shaped by her relationship with Fleur up to that point. If they have been friends, she might be a bit taken aback but then laugh it off as one of Fleur's eccentricities. However, if they have a more tenuous relationship, Hermione could become defensive. Her reaction might also be influenced by the presence of other characters. If they are in a public setting, she might be more embarrassed or try to quickly defuse the situation. And if there are underlying romantic or sexual undertones in the fanfiction, her reaction would be even more complex, perhaps blushing and feeling a bit flustered.
Another reason could be related to a spell or a magical effect. There might be a love - inducing spell or some kind of magic that made Draco act in this way towards Hermione. The neck kiss could be the first physical manifestation of this magically influenced attraction.
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.
The other Gryffindors would likely be divided. Some would be outraged, thinking that Hermione has betrayed the house by getting involved with a Slytherin, especially Draco Malfoy. However, others might be more understanding and see that love can cross house boundaries. In Slytherin, Draco's friends would also have mixed reactions. Some would be proud that Draco has managed to get Hermione pregnant, seeing it as a sort of conquest, while others might worry about the implications for their standing in the wizarding world.
Hermione could become withdrawn. She might isolate herself from her friends for a while, spending her time in the library trying to make sense of it all. She might also feel a sense of betrayal, especially if they had some sort of understanding or relationship developing.
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.
One possible plotline could be a moment of intense passion during a dangerous situation. For example, they might be in the middle of a battle against dark wizards, and Ron, fearing for Hermione's life, shows his love and protectiveness with that kiss on her neck. It could be a spur - of - the - moment thing that makes them realize their deep feelings for each other even more.
At first, Hermione would be shocked. But then, she would quickly compose herself. She could play along with Draco and Blaise for a while, pretending to be compliant while she actually gathers information about their motives and the place where they are holding her. She might also try to turn them against each other by highlighting their differences in goals or personalities. Given her intelligence, she would surely come up with a clever plan to get out of the situation.
She might be initially shocked. After all, Draco is usually seen as this tough Slytherin. But then she could feel sympathy. For instance, she might offer him a handkerchief without saying much at first.
She might be heartbroken at first. Hermione is someone who invests deeply in her relationships. She would likely retreat into her studies as a way to cope, burying herself in books to try and forget the pain.