Well, fanfiction involving such scenarios can be a bit of a grey area ethically. On one hand, if it's done in a non - malicious and non - sexual way, it could be seen as exploring different plot ideas within the fanfiction world. However, if it has any undertones of harm or inappropriate behavior, it's not okay. Many people might find it disturbing or against the spirit of the original characters.
There might be a fanfiction where Bellatrix gags Hermione during a battle at Hogwarts. Hermione, while gagged, uses her magic in a creative way to signal her friends for help. This shows her resourcefulness even in such a difficult situation.
I'm not sure if there is such a specific fanfiction. Fanfiction covers a wide range of themes and scenarios, but this one seems rather dark and not in line with the general positive spirit of the original story. However, the fanfiction world is vast, and it's possible that something like this exists in some corner of the internet.
It could be a new dark wizard or witch who is trying to gain power. They see Hermione as a threat due to her intelligence and magical abilities, so they immobilize her to stop her from interfering with their plans.
In a fanfiction with this theme, it could be set post - war. Draco and Hermione find themselves in a situation where they are on the run from some dark wizards who are after them for different reasons. During their escape, Hermione gets wet and cold. Draco, having a change of heart after the war, gives her his warm cloak. This act of kindness begins to break down the barriers between them, and they start to have deeper conversations, realizing they have more in common than they thought.
Writing or reading such inappropriate fanfiction that involves non - canon and vulgar concepts is not acceptable behavior in the fan community. We should focus on positive, respectful and canon - compliant fan works.
One possible plotline could be a rescue scenario. Maybe her friends discover she's in this state and they have to outwit the captors. For example, Harry could use his invisibility cloak to get close and free her.
One plot possibility could be that she is tied up and gagged as part of a prank by some of her friends, but in a light - hearted and non - harmful way. Then the story could be about how she gets revenge in a clever and funny way. Another idea is that she is in this state as part of a magical accident and the rest of the story is about her using her wits to free herself and solve the mystery behind the accident.
This kind of fanfiction concept is unacceptable. It goes against the values and nature of the original work and is not something that should be explored or entertained.
One possible plot development could be that Hermione manages to use her wits even in this dire situation. For example, she might use non - verbal magic to send a signal for help. Another could be that Bellatrix is using Hermione as bait to lure Harry or Ron into a trap. Maybe Bellatrix is trying to extract information from Hermione about the Order of the Phoenix.