One common theme is the growth of the characters. As they babysit, they learn more about themselves and become more responsible. Another theme is friendship. The babysitters form strong bonds with each other while taking care of the kids.
Stray Kids, on the other hand, would also be very concerned. Bang Chan, as the leader, would take charge. He might start asking questions to figure out what exactly happened. Felix could be bringing water or something to make Y/N feel better. Lee Know would be standing guard, making sure no further harm comes to Y/N while they are in a vulnerable state.
You can try looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics from various fandoms, including 'gakuen babysitters'. Another option is FanFiction.net, which also has a wide range of fan - created stories.
One idea could be a fanfic where the babysitters have to deal with a group of new students who are very mischievous. Another could be a story about the babysitters' own pasts and how it affects their current babysitting roles. Maybe a fanfic where they take the kids on an unexpected adventure outside of the school campus.
Y/N should have their own goals and dreams. If they're interested in becoming an Auror, that can shape their actions and decisions. Their reactions to Draco should be based on their personality. If they're a shy person, they might be more hesitant around him. And make sure their dialogue is natural. Don't make them say things that are out of character just to move the plot along. For instance, if Y/N is a studious type, they're more likely to talk about books or spells when interacting with Draco.
Another option is Archive of Our Own (AO3). It has a large collection of fanfictions. When it comes to 'gakuen babysitters fanfiction', you can find ones that take the original plot and give it a unique twist. Maybe there are fanfictions where new characters are introduced into the babysitting scenario, creating more complex and engaging storylines.
One idea could be creating an OC who is a transfer student with a mysterious past related to the babysitting club. For example, the OC's family might have a connection to the school that is slowly revealed. Another idea is an OC with a unique talent, like being able to communicate with animals, which could add an interesting dynamic to the babysitting situations. A third idea could be an OC who has a different cultural background and introduces new games and traditions to the kids in the club.
One idea could be an OC who has a special talent for music and uses it to soothe the children at the babysitting club. For example, when the kids are having a hard time going to sleep, the OC plays a soft lullaby on their guitar.