One idea could be that the cousins start this 'with benefits' relationship secretly during a family reunion. They might have to hide their growing feelings and physical encounters from other family members, which adds a lot of tension and drama.
Another plot idea is that they are forced into a situation where they have to pretend to be a couple for some family - related event. During this pretense, they start to have a 'cousins with benefits' situation. But then things get complicated when one of them starts to develop genuine romantic feelings and the other is still hesitant, not sure if they want to cross that line completely.
A plot could involve the cousins having a bit of a rivalry at first. They both think they are the better Miraculous holder. So they keep trying to one - up each other in battles against akumas. But then they realize that they are stronger together and start to work as a team. Also, they could explore the idea of the cousins having different Miraculous animals that give them unique abilities that complement each other.
One idea could be that they discover their family connection during a magical crisis. Maybe a dark force is threatening both the wizarding world and the world of the Greek gods, and their combined powers as cousins help in the fight. For example, Harry's knowledge of complex spells and Percy's control over water could be used in creative ways to defeat the enemy.
One plot idea could be that Dora and Diego discover a magical place while on an adventure together. In this place, their bond as cousins is tested when they meet a mischievous creature who tries to create misunderstandings between them. But in the end, they overcome the challenges and their relationship becomes even stronger.
Here's a plot. Percy and his cousins are invited to a special tournament among demigods from all over the world. But it turns out to be a trap set by an evil force that wants to use their combined powers for its own dark purposes. As they fight to escape, they learn more about their individual strengths and how to work together as a family. They also meet some interesting new characters from different mythologies during their struggle, and these new allies help them in unexpected ways to defeat the evil force and save the day.
A more comical plot could be that they are forced to live together for some reason, like a family obligation. Tony's more outgoing and Reid's more introverted nature could create a lot of humorous situations as they try to co - exist. For example, Tony might try to get Reid to go out and party, while Reid just wants to read his books in peace.
One plot idea could be that they discover their family connection early on. Maybe they find a hidden family tree or an old letter that reveals the truth. This could lead to them having to work together secretly to protect their newfound family bond from the wizarding world's prejudices.
One idea could be that the two best friends enter into this 'with benefits' relationship secretly, but then they start to develop real romantic feelings. For example, they might find themselves getting jealous when the other is with someone else. Another idea is that they decide to end the benefits part but struggle to go back to just being plain friends because the physical aspect has changed their dynamic so much.
Another plot could revolve around the characters having premonitions of the events that are going to occur in the quarry. They then have to decide whether to trust these visions and how to act upon them. This could add a whole new layer of suspense and mystery to the story.
One idea could be a time - travel plot. The Backyardigans accidentally find a magical object in the backyard that sends them to different eras in history. They could have to work together to find their way back home while also learning about the different time periods. For example, they might end up in the prehistoric era and have to deal with dinosaurs.
One idea could be a story where one of the dalmatian puppies gets lost during a family outing and has to find its way back home, facing various challenges along the way.