Perhaps the baby is a key to a truce between Spartacus' rebels and the Romans. Ilithyia, being from a Roman family, could be in a difficult position as she tries to balance her love for the baby and her loyalty to her people. The story could explore how Spartacus and Ilithyia work together to ensure the baby's safety and the future of their people.
Their relationship could develop through their shared love for the baby. At first, they might be at odds, but as they care for the baby together, they start to understand each other better. For example, Spartacus could see a different side of Ilithyia as she shows her maternal instincts.
Yes, there are some really interesting ones. You can find them on various fanfiction websites. Some focus on the forbidden love between them, exploring how their different statuses in society add to the complexity of their relationship.
A crossover with a modern - day action story could be really cool too. Spartacus and his crew could be brought to the present day through some time - travel mishap. They then have to navigate the modern world, learning about new weapons and technology. They could use their ancient fighting techniques in modern combat situations, like taking on a powerful criminal organization.
Fanfiction.net is a great place to start. It has a large collection of fan - created stories, and you might be able to find some good ones about Ilithyia and Spartacus there.
One idea could be that baby Mario and baby Luigi get lost in a magical forest filled with strange creatures. They have to use their baby wits and little jumps to get through obstacles and find their way back home. Maybe they befriend a little fairy who guides them part of the way.
One idea could be that Baby Mario and Baby Peach go on a magical adventure through the Mushroom Kingdom, encountering new and strange creatures along the way. They might have to work together to solve puzzles to reach a special power - up that can save the kingdom from a new threat.
One idea could be a story where the baby in the 'baby project' has some sort of special power that the characters have to figure out how to manage. Maybe the baby can communicate telepathically and it leads to all sorts of comical and heartwarming situations as the characters try to understand what the baby wants.
One plot idea could be that Baby 5 and Sai are on a mission together. They start off not getting along well because of their different personalities. Baby 5 is impulsive and Sai is more reserved. But as the mission progresses, they begin to understand each other's strengths and develop a mutual respect. They end up saving each other during a dangerous encounter and form a strong friendship.
One idea could be about the baby's first adventure in a magical garden. Maybe the baby discovers a hidden path and meets talking animals who teach it about the magic of nature.
One idea could be that the baby has a special power that tames the beast. For example, the baby's laughter might have a calming effect on the usually fierce beast.