It has a certain level of popularity. There are fans who like to read and write this type of fanfiction as it allows for a different perspective on the relationships in the Harry Potter universe. However, it also receives a fair amount of criticism. Many people believe that it distorts the original essence of the characters. But overall, within the large and diverse fanfiction community, there is an audience for it.
There are those who, when caught cheating, will try to shift the blame. In a business deal, if one partner is caught cheating on the contract terms, they might try to say that the other party didn't communicate clearly. But in general, being caught cheating often leads to a loss of trust. Whether it's in a friendship, a relationship, or a professional setting, once caught cheating, it's very difficult to regain the respect and trust of others.
Some fanfiction might involve a character like Hermione cheating on Ron in their relationship. For example, in certain stories, she might be magically influenced to develop feelings for another character and act upon them, which is considered 'cheating' in the context of the relationship established in the original series. However, this is a deviation from the original moral framework of the books.
There was a guy who tried to cheat in a card game. He had hidden some extra cards up his sleeve. As he was getting too confident and making big bets, he accidentally dropped a card from his sleeve. Everyone saw it and burst out laughing. He was so embarrassed and of course, caught cheating in the most comical way.
Once, in a school exam, a student tried to cheat by writing answers on his palm. But when he went to the toilet to check, he accidentally washed his hands and all the answers were gone. He came back looking so confused and defeated, it was really funny.
Well, Harry could marry one of the veelas. Given their beauty and allure, it would add an interesting dynamic to the story. Their relationship could involve Harry having to deal with the jealousy of other wizards and also the cultural differences of the veelas. Or he could marry a descendant of one of the founders of Hogwarts. This would tie in a lot of Hogwarts history into their relationship, and their wedding could be a grand event that unites different factions within the wizarding community who have ties to the founders.
Maybe Dumbledore, if he were still alive in the fanfiction. Dumbledore was highly respected and had a great influence. Knighting Harry would be a way for him to publicly recognize Harry's achievements and heroism on a grand scale.
Well, it depends on how the author of the fanfiction writes it. Maybe Sirius would be initially angry. He has a certain view of Harry as a young wizard he cares about, like a surrogate family member. So, seeing Harry in such an intimate situation might make him feel like he has failed in some way to guide Harry properly. On the other hand, it could also lead to a more understanding Sirius, who realizes that Harry is growing up and tries to support him in a more nuanced way, like helping him understand the boundaries of relationships.