Another possibility is in a magical world - twist fanfic. Hermione discovers a magical piercing that gives her an extra boost of magical power. However, there are side - effects that she has to figure out how to deal with. Maybe it makes her spells a bit too powerful at first and she has to learn control.
In some fanfictions, Hermione's piercings could be a result of a traumatic event. For instance, she might have lost someone dear to her and decided to get piercings as a way to remember them or as a form of coping mechanism. This would add a whole new layer of depth to her character as she struggles with her emotions while also dealing with the reactions of her friends and the wizarding community at large.
One interesting story could be where Hermione's tattoos hold magical powers. For example, she has a tattoo that glows when dark magic is near, helping her and her friends detect danger. The piercings could be enchanted too, like a nose piercing that allows her to understand ancient spells when she whispers through it.
They might make her more alluring to some characters. For instance, Ron could be initially shocked but then find her new look really attractive. It could add a new layer of tension or excitement to their relationship.
One idea could be a story where Percy uses his tattoos and piercings to express his rebellious side. Maybe he's in a world where such things are not fully accepted, and he has to fight against the norms.
One great Drarry fanfiction where Harry has piercings is 'Pierced Hearts' by [author name]. It delves into how Draco reacts to Harry's new edgy look with piercings. The story beautifully shows their relationship evolving in this new context.
Some Harry Potter - focused fan communities on social media platforms like Reddit or Tumblr might also be a good source. Sometimes fans will share their favorite fanfics or even write their own short stories about Hermione and her piercings there. You can join relevant groups and ask for recommendations.
One great 'Hermione Piercings' fanfic is 'The Pierced Witch'. It has an interesting take on how Hermione's piercings are part of a new magical trend in Hogwarts. The author describes her piercings in a very detailed and creative way that adds to her character's charm.
One possible storyline could be that Peter gets piercings as a form of self - expression. Maybe he's tired of being the 'good boy' all the time and decides to rebel a little with piercings. It could also be part of a disguise in his Spider - Man activities, to make him look less like the Peter Parker everyone knows.
You can try fanfiction websites like Archive of Our Own (AO3). It has a vast collection of fanfictions on various topics, and there's a good chance you'll find some related to 'Harry has piercings' there.