Well, in some fanfictions, Harry might use a super - powered Patronus. His Patronus could be stronger than usual, perhaps due to some newfound magic or a special connection he has developed. It could be so powerful that it simply overpowers the dementors and destroys them.
One possible plot could be a story where a character, perhaps Harry himself, is being haunted by Dementors more than usual. The lemon element could come in as a new form of magic or charm that has an unexpected side - effect related to love or attraction. Maybe a female character uses this new charm to fight off the Dementors' influence on Harry, and during this process, a romantic and somewhat steamy relationship develops between them.
It's often described as an icy - cold and terrifying experience. The Dementors are usually depicted as hovering over the female Harry Potter character, their hooded forms menacing. The Kiss itself might be described as a sort of draining sensation, like all the warmth and hope being sucked out of her.
In many fanfictions, Dementors are used as a tool to create a sense of despair. For example, when a character is facing a Dementor, their worst memories are brought to the surface, and this can be used to develop the character further. The fanfictions might also show how different characters react to the Dementors in different ways. Some might be paralyzed with fear, while others might try to fight back using magic like the Patronus charm.
One way is through group support. If characters are together, they can draw strength from each other. For example, Hermione could use her knowledge to come up with a plan. Ron could offer his loyalty and courage. And they could all hold hands and face the Dementors together. Also, they might find some magical artifacts that can help, like a special amulet that gives them a sense of calm when Dementors are near.
One possibility is that Harry would grow up to be a very different person. Dementors are creatures of despair, so he might be more withdrawn and less trusting. He could also have some very dark powers, having been exposed to the dementors' influence for so long.
It could be really wild. Maybe Harry uses his Patronus charm in a new and unexpected way. Instead of just driving the dementors away, he somehow makes the Patronus 'entertain' the dementors. Like the Patronus could be a stag that does acrobatic jumps and the dementors are curiously watching it, almost like they are being played with.
In fanfiction, dementors often serve as a source of great danger. For example, in many stories, they are used by dark wizards to guard important or secret places. Their ability to suck out the soul makes them a terrifying obstacle for the heroes to overcome.
In fem Harry Potter fanfiction, the Dementors' Kiss can be a really dark and powerful element. It often represents ultimate despair and loss of the soul. It can be used to heighten the stakes for the female Harry Potter character, showing just how dangerous the magical world she lives in can be.
If Harry killed dementors in a fanfiction, it could have several implications. For one, it could be a sign of his growth and mastery of magic beyond what was shown in the books. It might also lead to a different relationship between him and the Ministry of Magic. Since dementors were used as guards in Azkaban, their deaths could cause chaos in the prison system. Additionally, it could change the perception of the dark side in the wizarding world, as dementors are a symbol of the darkest elements.