He'd probably be shocked at first. After all, getting a howler is quite embarrassing.
Draco might initially be angry. He has his pride, and getting scolded by Annabeth in such a public way (since howlers are known to be loud and can't be ignored easily) would bruise his ego. But then he might start to think about what he did wrong and whether he should make amends, depending on how the fanfic writer portrays his character development. If he's the type to learn from his mistakes in this fanfiction, he could start to change his ways. However, if he's more stubborn, he could become resentful towards Annabeth and try to get back at her in some way.
Draco could be a bit of a mix of emotions. At the start, he'd likely be both startled and a bit humiliated. He's used to a certain status in his own world, and this howler from an outsider like Annabeth would shake that up. He might try to play it cool in front of others, but inside he'd be seething or confused. As he reads or listens to the howler, if it contains valid points, he could have a moment of self - reflection. Maybe he'd start to question his own actions and attitudes. But if the howler is more of an angry rant without much substance, he might just dismiss it as Annabeth being overly emotional or something like that, depending on how the fanfic has set up their relationship dynamic.
However, if Hermione knew she was in the wrong, she might feel ashamed. But still, she would likely try to make amends in a more private and rational way. She wouldn't just take the public humiliation lying down. Instead, she'd approach Annabeth later and say something like 'I'm sorry for what I did, but the howler was too much. Let's talk about this properly.'
He might be initially shocked. Draco is used to being the one in control and having others be intimidated by him. A Howler from Percy, someone he may not have considered a huge threat before, would be unexpected. He could be angry and vow revenge in his mind.
Harry might immediately gather his friends and share the contents of the Howler with them. He values their input and they've always been there to support him. Together, they would analyze the message and come up with a plan. Maybe he'd be a bit angry too, feeling that Voldemort is always trying to disrupt his life and the safety of those around him.
Well, it could be that Draco did something to cross Annabeth in the fanfic's plot. Maybe he messed with one of her plans or said something disrespectful about her friends.
He might be very embarrassed. Howlers are known for delivering their messages in a rather loud and public way. Draco, who is used to maintaining an image of superiority, would find it humiliating to have his family's business aired out in front of his classmates.
He might be initially shocked. After all, getting a Howler is a very public and embarrassing thing. He could be so ashamed that he immediately hides away to read it privately, his face turning red with a mix of anger and humiliation.
In some fanfictions, Sirius might use it as a chance to show off his independence. He could read the Howler out loud in front of his friends, laughing at his mother's old - fashioned views. This would show that he doesn't care about her threats and is proud to be different from the rest of the Black family.
Often, when Draco gets a howler from Annabeth in fanfiction, it creates tension and conflict. It might expose something secret or force them to confront their feelings. Also, it could draw in other characters and complicate the story even more.
Well, it could be because Hermione did something that Annabeth considered a betrayal in the context of the fanfic. Maybe she broke a pact or made a decision that went against Annabeth's plans.
Well, it could vary a lot depending on the author's imagination. Sometimes it triggers a series of conflicts and misunderstandings, while in other stories, it might bring them closer together.