Well, in this fanfic, the setting of getting a flu shot could be really interesting. It could be at a Muggle hospital that Harry and his friends visit secretly. The nurse giving the shot might be completely unaware that she's dealing with a famous wizard. Harry might be thinking about all the potions he's had at Hogwarts and comparing them to this strange Muggle medicine. He might even wonder if there's a way to make a potion that works like a flu shot so that wizards don't have to go through this somewhat scary process.
Most likely Hermione. She is always looking out for Harry's well - being and would want to make sure he gets the flu shot properly. She would also be curious about the Muggle medical procedure.
One possible 'horror' could be an allergic reaction. Some people are allergic to components in the flu shot, like egg proteins if the vaccine is egg - based. They might experience symptoms such as hives, swelling, or difficulty breathing shortly after the injection. However, such severe allergic reactions are very rare.
I heard of someone who had a high fever after getting a flu shot. They were really worried as it was unexpected. But it turned out that in some rare cases, the body's immune response can cause a fever as it is fighting off the antigens from the vaccine. It subsided after a couple of days with proper rest and taking over - the - counter fever reducers.
Friendship is a very common theme. Just like in the original series, many one - shot fanfics explore the deep bonds between Harry, Hermione, and Ron. For example, there are fanfics where they have to rely on their friendship to get through a difficult situation in Hogwarts.
I'm not aware of any such fanfic. Fanfiction often contains a wide variety of strange and inappropriate concepts, but this one seems rather extreme and goes against the nature of the original Harry Potter story in terms of the characters' relationships.
Unfortunately, I don't have information on the author of this particular fanfic. It could be an amateur writer who just wanted to explore this scenario with the character Ciel. There are numerous fanfic communities where such works are published, but without more details, it's impossible to say who wrote it.
Well, without reading it specifically, it could be about a character named Ciel getting a shot. Maybe it's a medical shot in a hospital setting and the story focuses on Ciel's fear or bravery during the process.
Perhaps Snape catches the stomach flu and the students, including Harry, Potter, Ron, and Hermione, decide to make a special potion to cure him. This could lead to a series of adventures as they try to gather the rare ingredients for the potion. They might even discover some secrets about Snape along the way, and this whole situation could change their relationship with him. Also, it could be a chance for the students to show their growth in potion - making skills.