A plot could revolve around Hermione accidentally getting bitten while trying to protect Minerva. Minerva then takes it upon herself to mentor Hermione through her new werewolf life. This would lead to a deepening of their relationship as they face the challenges of Hermione coming to terms with her new identity together.
One idea could be that in a world where werewolves are more accepted, Hermione discovers Minerva was once bitten and becomes determined to help her during the full moon. She could research new spells to ease the transformation pain.
A possible plot is that Hermione gets into some serious trouble at Hogwarts, perhaps framed for a major rule violation. Minerva, as a mother - figure, believes in Hermione's innocence and works tirelessly to clear her name. Along the way, they share heart - to - heart conversations about Hermione's past, her Muggle - born status, and how Minerva overcame her own difficulties as a young witch. This deepens their relationship and forms a beautiful mother - daughter dynamic.
One idea could be Minerva discovers Hermione is her long - lost daughter through a magical revelation. For example, a spell gone wrong reveals their true relation. Another could be Hermione facing a difficult situation at Hogwarts and Minerva, as her mother, steps in to protect her in ways a normal teacher wouldn't. Maybe Hermione is being wrongly accused of something and Minerva uses her influence and motherly love to clear her name.
Maybe in the fanfiction, the marriage law is a ploy by a dark wizard to disrupt the order in Hogwarts. Hermione and Minerva have to pretend to be happily married to fool the enemy. During this time, they learn about each other's insecurities and strengths. Hermione might introduce Minerva to some modern Muggle concepts that could be useful in their fight against the dark forces, and their relationship gradually turns into a real and deep connection.
How about a story where Hermione discovers a hidden talent for transfiguration that even McGonagall is surprised by. They then work together to perfect this new form of transfiguration, but face opposition from some of the more traditional - minded professors. Or, in a post - war Hogwarts, they collaborate to reform the curriculum to include more practical and modern magic, all while dealing with the after - effects of the war on the students and the school.
Maybe there's a plot where a werewolf pack is causing trouble in the wizarding world and Hermione, Fleur, and some other characters team up to deal with it. Along the way, Hermione and Fleur develop a special bond that goes beyond friendship. There could be elements of mystery, action, and romance in such a plot.
Another plot could be that Akakuro is a werewolf with a special ability, like the power to see the future. He uses this ability to try and prevent a great disaster from befalling his werewolf brethren, but in doing so, he makes some powerful enemies within the werewolf community.
One plot idea could be a werewolf Death Eater who is forced to work with Hermione under some strange circumstances. Maybe they are both on a mission to retrieve a powerful magical artifact, and along the way, the werewolf starts to question his loyalty to the Death Eaters as Hermione shows him the value of kindness and justice.
There are several good ones. 'The Werewolf Within' is a fanfiction that explores Minerva's inner struggle as a werewolf and how Hermione helps her through it. It's beautifully written with great descriptions of their emotions. 'Lunar Alliance' is also a great read where they form an alliance with other magical creatures in the wizarding world, all while dealing with Minerva's werewolf nature.
Maybe Thalia is turned into a werewolf instead. Percy then has to protect her from those who want to hunt werewolves. They could end up in a werewolf pack where Thalia has to learn the ways of the pack, and Percy has to earn the trust of the pack to stay with her. This could lead to a lot of internal conflict within the pack as well as between Percy and some of the pack members.
One plot idea could be that Hermione, after graduating from Hogwarts, returns as a teacher. She and Minerva start to work closely together and gradually fall in love. They face some initial opposition from the wizarding community due to their age difference and the unconventional nature of their relationship, but they overcome it and get married in a small, private ceremony at Hogwarts.