A really interesting plot could be that Natsume and Mi accidentally swap bodies. This would create a lot of comical situations as they try to adjust to living in each other's shoes. They would have to deal with each other's friends and family while also trying to figure out how to swap back. In the process, they might gain a new perspective on each other's lives and become even closer friends.
Their relationship could develop through shared hobbies. For example, if they both like painting, they could start painting together more often, and this would strengthen their bond. They might also develop their relationship through helping each other out in school. If one is having trouble with a subject, the other could tutor them.
The plot could also involve some sort of misunderstanding. For example, Sasayan is seen with another girl by Natsume, and she gets jealous and starts to avoid him. Sasayan, on the other hand, has no idea what's going on. It could lead to a lot of angst and drama as Sasayan tries to figure out why Natsume is acting so strangely. Eventually, after some miscommunications and heartache, they clear up the misunderstanding and their relationship becomes even stronger.
You can try looking on fanfiction websites like FanFiction.net or Archive of Our Own. These platforms usually have a large collection of fanfictions for various anime and manga series, including 'My Little Monster'. Just use the search function and type in 'Sasayan x Natsume' to see if there are any relevant fanfictions.
One idea could be an OC who has a special ability to communicate with yokai in a different way than Natsume. For example, instead of seeing them like Natsume does, the OC can hear their thoughts. This could lead to unique interactions and problem - solving within the yokai world.
One idea could be exploring how they adapt to the news. Mikan might be initially scared but then excited about the new life. Natsume could be overprotective, making sure Mikan is always comfortable and safe. Another plot could involve their friends' reactions, like how they support or are shocked by the pregnancy.
One idea could be Natsume and Mikan getting lost in the Forbidden Forest in Alice Academy. They have to rely on each other's unique Alice abilities to find their way out. Another plot could be a time - travel scenario where they are sent back to the founding days of the academy and have to figure out how to return to their own time while also uncovering secrets about the academy's past. And a third idea is a body - swap situation where Natsume and Mikan swap bodies and have to deal with the daily life and challenges of being in each other's shoes.
One plot could be that an evil organization creates a clone of Mikan. Natsume has to figure out which is the real Mikan. This leads to a lot of confusion and also some moments where he realizes how much he truly knows and cares about the real Mikan. Another idea is that Natsume and Mikan get trapped in a dream world created by a powerful Alice user. In this world, their deepest desires and fears are manifested. They have to work together to break free from this world, which involves facing their own insecurities. And for a third plot, there could be a story where Mikan discovers she has a rare and powerful secondary Alice that only Natsume can help her control. This creates a new dynamic in their relationship as they train together to master this new power.
Another plot could be that the little mommies decide to put on a big show for their community. They face all kinds of challenges in preparing for it, like finding the right costumes, learning their lines if there are any, and dealing with stage fright. But in the end, they put on an amazing show that brings the whole community together.
Well, you could write about a mage who discovers a unique magical ability that no one else has. This ability could be both a blessing and a curse. For example, it might attract the wrong kind of attention from dark forces. Or perhaps a story where the mages participate in a magical tournament. They would have to use their skills and wits to outperform their opponents, and along the way, they might make new friends or enemies. And don't forget about the possibility of a love story between two mages, which could add an interesting layer of drama.
One idea could be exploring the backstory of the characters before they got married. Maybe how they first met and the initial feelings they had for each other.