In such a fanfiction, perhaps it could explore an alternate universe where time and relationships are distorted. Maybe there's some sort of magic gone wrong that leads to this unexpected situation. It could also be about how they deal with the social and family implications of such a pregnancy.
One possible plot could be that Ash and Lily are in a relationship that has been growing secretly. They face challenges from their friends and families when they find out about the pregnancy. Ash might struggle with the sudden responsibility but then decides to step up and be there for Lily and the baby.
Perhaps in the fanfiction, there is some sort of magic gone wrong. Harry and Fleur are caught in a magical spell that makes them act out of character. This leads to their relationship becoming more intimate than expected and Fleur getting pregnant. The rest of the story might be about them trying to reverse the spell while also coming to terms with the pregnancy.
Well, in this fanfiction, it could start with Harry and Daphne having a secret relationship. Then, when Daphne discovers she's pregnant, there could be a lot of drama. Maybe Harry is in the middle of some important wizarding mission or dealing with his own personal issues. They would need to figure out how to balance their new situation with all the other things going on in their lives. It could also lead to some interesting character growth for both of them as they step into new roles as future parents.
One possible plot could be that Lily has to face the challenges of being a pregnant student at Hogwarts. She might have to deal with the reactions of her friends and professors. Maybe she'll try to hide it at first out of fear of being expelled or judged.
A really interesting plot twist could be that after getting pregnant, Lily loses her memory. So Snape has to deal with not only the fact that he's going to be a father but also that Lily doesn't remember their relationship. And then James steps in to help, thinking the baby is his. This would create a very strange love triangle situation. Also, what if the baby Harry has some sort of special power from the start that no one expected, which could be a major plot twist.
Harry would likely become more responsible and protective. He'd have to grow up quickly to face the situation. Lily, on the other hand, might become more assertive in her decisions regarding the pregnancy and their future.
It could be about Lily's friends supporting her during this new experience. Maybe they bring her comfort items like warm tea and chocolate.
In a possible plot, Lily might be hurt during a quidditch match. Maybe she gets hit by a bludger and falls from her broom. Her friends then rush to her aid, and there could be a lot of worry and panic among them. They take her to the hospital wing where she recovers slowly while her friends stay by her side, showing the strong bond of friendship.
Well, it could be a story about the anticipation and joy they feel. Maybe it focuses on how they prepare for the arrival of their child, like setting up the nursery. Harry might be a bit nervous about being a father, but Ginny is there to reassure him.
One possible plot could be that it starts with an unexpected encounter between Harry and Gabrielle. Maybe they are in a situation where they have to work closely together, like in a magical mission. As they spend more time together, feelings develop and one thing leads to another, resulting in Gabrielle getting pregnant. Then the story could focus on how they deal with the news, the reactions of their friends and families, and their own fears and hopes for the future.