One popular fanfiction idea could be that Hermione accidentally consumes a love potion meant for someone else. She then starts acting out of character, perhaps showing an excessive amount of affection towards an unexpected character. This could create chaos in Hogwarts as her friends try to figure out what's wrong and reverse the effects.
Another scenario might involve an old, forgotten love potion in the Hogwarts castle that Hermione stumbles upon during one of her research expeditions in the restricted section of the library. The potion activates when she touches it, and she starts having dreams about a mysterious figure. She becomes determined to find out who this figure is while also trying to keep her condition a secret from her friends. As she delves deeper into the mystery, she discovers a long - lost love story that has some connection to her own family history.
One common plot is that someone accidentally slips a love potion to either Harry or Hermione, which then causes all sorts of comical and sometimes complicated situations. For example, if Hermione is affected, she might start acting completely out of character around Harry, like being overly affectionate and forgetting about her usual studious nature. It can also lead to misunderstandings between them and their friends, as others try to figure out what's wrong with the suddenly love - struck character.
The theme of redemption can also be found in some of these fanfictions. A character who has made mistakes in the past might use a love potion to try and make amends with someone they've wronged. But then they realize that using the potion is wrong in itself and they have to find a more genuine way to earn forgiveness. It shows their journey towards becoming a better person. Also, the power struggle between good and evil can be a theme when the love potion is used as a weapon by the bad guys. The good characters have to fight against the false love created by the potion to save their relationships and the wizarding world.
A great plot twist could be that the love potion Hermione is exposed to actually has a secondary effect. While it initially makes her seem infatuated, it's secretly stealing her magic. As she becomes more and more 'in love', her powers start to wane. Her friends notice the change in her abilities and suspect foul play. They then have to race against time to find out what's really going on and reverse the effects before she loses all her magic.
Obviously, Harry and Hermione are the main characters. They are the focus of the love potion's effect. Whether it's Hermione being affected by the potion and having new - found feelings for Harry, or vice versa, their relationship is at the center of the story.
In some fanfictions, the love potion can have unforeseen consequences. Maybe Harry Potter himself gets dosed with a love potion and instead of falling for the person who gave it to him, his feelings are redirected towards his friendship with Ron and Hermione. This could lead to some really heart - warming scenes as he realizes the true depth of his platonic love for them through the warped lens of the love potion's effects.
One interesting 'Love Potion' fanfiction could be about a character accidentally drinking a love potion meant for someone else. This could lead to all sorts of comical and chaotic situations as they start to have strong, uncharacteristic feelings for another person.
I'm not sure of a specific one titled exactly like that, but you could search on fanfiction websites like Archive of Our Own or FanFiction.net. Try using the keywords 'Harry Potter', 'love potion', and 'lemon' in the search bar. There are likely to be some creative stories that combine these elements.
One popular fanfiction idea could be that Ginny accidentally consumes a love potion meant for someone else and Harry has to figure out how to reverse it while dealing with his own confused feelings. He realizes that his true feelings for Ginny are strong even without the potion's influence.