Harry's first reaction in the fanfiction could be one of confusion. He's used to Draco being his nemesis, always making snide remarks and competing with him. So when he realizes Draco is under the Imperious Curse, it doesn't immediately click in his mind. He might start to replay all of Draco's recent actions in his head, trying to make sense of it. Then, as the realization dawns on him, he would be both horrified and determined. Horrified that such a dark magic is being used on a fellow student, and determined to get to the bottom of it and free Draco from the curse's control.
When Harry first discovers that Draco is Imperious, he may initially be suspicious. He would question whether it's some sort of trick Draco is playing. But as he observes Draco more closely and sees the glazed look in his eyes or the uncharacteristic actions, Harry will start to believe it. Then he would probably feel a mix of emotions. There's the shock, as I said, but also a sense of responsibility. He might think that he has to do something about it, like find a way to break the curse. Harry could also be a bit angry that someone would use Draco in such a way, even though they have their differences.
Harry is likely to be shocked at first. He has always seen Draco as a self - willed rival, so finding out that Draco is being controlled by the Imperious Curse completely changes his perception. He might freeze for a moment, trying to process what he has just realized.
Well, in this type of fanfiction, a plot point could be the change in Draco's behavior. Since he is under the Imperious Curse, his actions might seem out of character. Harry might notice that Draco is doing things that he wouldn't normally do. For example, Draco might be acting more subservient or being forced to target Harry in a more malicious way than before. This would make Harry start to suspect something is wrong. Also, there could be a plot point where Harry has to convince his friends, like Hermione and Ron, that Draco is not acting of his own free will. They might be skeptical at first, but as Harry uncovers more evidence, they come around to help him figure out how to break the curse on Draco.
Well, in many such fanfictions, Harry might be shocked at first. He probably feels a sense of pity for Draco too. After all, being under the Imperius Curse means Draco has no control over his actions.
Harry might be shocked at first. He'd probably feel a sense of urgency to break the Imperius Curse. He could also feel a bit of pity for Draco, as Draco is being controlled against his will.
In the fanfiction, if Harry discovers Draco is imperioused, he might first be shocked. Then he would probably try to find a way to break the imperius curse. He could seek help from the teachers at Hogwarts, like Professor Snape or Professor Flitwick, who are knowledgeable about dark magic and counter - curses.
Harry might initially be very angry and hurt. He could cut off all communication with Draco and become withdrawn. In some fanfics, he would even start to avoid places where he might run into Draco.
Draco would probably be extremely angry. He might feel a deep sense of hurt and betrayal, especially if he considered Harry a friend or at least an acquaintance he could trust. He could start plotting revenge against Harry, using his own cunning and Slytherin skills to make Harry's life difficult at Hogwarts.
He'd probably be annoyed. Snape is a serious wizard and he might think fanfiction is a silly Muggle - influenced concept.
He might be curious. Harry is always eager to learn new things. He'd probably read it with great interest to figure out what this new world of RWBY is all about.
Perhaps Voldemort himself. He might see Draco as a tool, and Imperiusing him would allow Voldemort to have more control over the Slytherin side of Hogwarts or use Draco to spy on Harry. Another possibility is a rogue wizard who has a grudge against the Malfoy family and wants to cause them trouble by making Draco do things he wouldn't normally do while under the Imperius Curse.
Harry might be confused at first. He doesn't understand why Draco would think he's a doll fan. So he might just shrug it off and not pay much attention, thinking Draco is just being his usual difficult self.