Spongebob could be so frightened that he starts imagining the things from the story all around him. He might jump at every little noise or movement, thinking it's related to the scary story. And he would probably keep begging Squidward to stop telling the story, but also be a bit curious to hear more at the same time.
He probably gets really scared and starts shaking.
There are many possible reactions from Archie. If the story is very engaging, he might be on the edge of his seat, his eyes wide with anticipation. On the other hand, if the story is not to his taste, he may seem a bit distracted. However, it also depends on his relationship with Edith. If they are close, he might be more patient and try to enjoy the story regardless of its content.
He might tell about a spooky sea monster that lurks in the deep ocean.
Again, without more details, it's hard to say. He might be very interested and listen attentively, nodding his head and asking questions throughout the story.
Since we don't know what the story is, it's difficult to predict Amir's exact reaction. But generally, if the story is engaging, he could be completely absorbed in it. He might interrupt Soraya to share his own related experiences or just listen intently and give his thoughts and comments after she finishes. He could also be inspired by the story and think about how it relates to his own life.
Harry could also be very hurt. He might start to question what he did wrong and try to talk to Ginny to find out the reason. He might say things like 'Ginny, I don't understand. What have I done?' in an attempt to clear up the situation.
Well, the original series is mainly about their daily comical interactions in Bikini Bottom. But in the mpreg fanfiction, it takes a completely different turn with the pregnancy concept which is not part of the original plot at all.
He might be giggling all the time. Spongebob has a great sense of humor, so if the story has any funny parts, he would surely be laughing out loud.
Chita might be very excited and listen attentively.
It could start wagging its tail happily, showing that it is enjoying the story. Maybe it even gives a little bark or two in response to the exciting parts of the story.
He might be really confused at first. Spongebob is often naive, so he may not immediately understand why everyone is angry. He could just keep smiling and asking what's wrong in his innocent way.