One common theme could be the idea of a power dynamic shift. Since there's a bet involved and the collar aspect, it might explore Hermione being in a more submissive position than she usually is, which is a big change from her strong - willed character in the original series.
I'm not sure of specific 'hermione lost bet collar fanfiction' stories off - hand. You could try searching on fanfiction - specific websites like Archive of Our Own or FanFiction.net. They usually have a large collection of fan - created stories, and by using relevant keywords in the search bar, you might be able to find what you're looking for.
Another aspect could be that the leash situation is a way for the author to introduce some comical elements into the fanfiction. Hermione is known for her intelligence and seriousness, so seeing her in a situation where she has to abide by the rules of a lost bet and be on a 'leash' can create some really funny and unexpected scenarios. It can also show how she copes with being in a subservient position, which is very different from her usual role in the wizarding world.
I'm not aware of any fanfiction with such a title that would be appropriate for all ages. Fanfiction often involves the creative interpretations of fans, but this title seems to have inappropriate implications. It's better to focus on positive and family - friendly fan - created stories about Hermione, like those that explore her academic achievements or her friendships.
It's possible that the one she lost the bet to is a rather mischievous character. So, Hermione might find herself in a situation where she has to put up with a lot of pranks while being 'on the leash' so to speak. She could be made to do things that go against her usual studious and rule - abiding nature, which would be quite an interesting twist in the fanfiction.
There was a man who lost a bet with his wife. The bet was on who could save more money in a month. He thought he had it in the bag, but he ended up spending more on impulse buys. As a result, he had to take his wife on a romantic weekend getaway. It was an unexpected outcome for him, but it brought them closer together as they had a wonderful time on the trip.
Since this is not a common or well - known type of fanfiction, it's hard to define specific characteristics. But if we assume it exists, perhaps it might involve some sort of strange or unorthodox situation related to Hermione and the idea of a 'collar' which could be interpreted in many odd ways. However, this doesn't seem like a positive or typical fanfiction concept.
Well, perhaps a man lost a bet to his wife about who could grow the nicest plant. He was so sure he could do it better with his 'dp' (which could stand for a special plant food or something). But in the end, he lost. As a result, he had to clean the garage which was full of old tools and junk. His wife supervised with a big smile on her face.
Well, without more context, it's hard to say exactly. It could involve a bet between two gay friends, like a bet on a sports game or some sort of competition. And when one lost the bet, perhaps they had to do something embarrassing or out of their comfort zone. Maybe they had to wear a crazy outfit for a day or perform a silly task in public. But again, this is all speculation without knowing the actual story.