Another possible plot twist is that the oc's pregnancy might be a threat to the family's harmony in a different way. For example, some of the brothers might have plans or dreams that are now put on hold because of the pregnancy, causing conflicts within the family that go beyond just jealousy or rivalry.
Perhaps the oc's pregnancy could be part of a bigger conspiracy. Maybe someone outside the family is using the situation to try and break up the family or gain something from them. This could involve false information about the pregnancy, or attempts to manipulate the brothers' reactions to it.
One idea could be an OC who is a talented artist. She could use her art to bond with the brothers in different ways. For example, she might paint portraits of them, which could lead to some sweet and funny interactions as they react to how she's depicted them.
The brothers could develop in their relationships with each other. For instance, they might have to put aside their differences and work together to support the oc during her pregnancy. This could lead to stronger bonds between some of the brothers who previously had rivalries.
Well, perhaps the plot twist is that Gwendolyn is pregnant, but it's not a normal pregnancy. It could be a result of some sort of magical or scientific experiment gone wrong. For example, she was part of a study to find a cure for infertility, and instead, she ended up with an unexpected pregnancy that has strange side - effects. This would change the direction of the fanfiction completely.
A possible plot twist in a Daria pregnant fanfiction is if Daria decides to give the baby up for adoption, but then changes her mind at the last minute. This would create a lot of drama and also show her growth as a character. Or perhaps the baby has some sort of special ability or condition that Daria has to figure out how to deal with, which would be a huge change from the normal Daria - centric storylines.
One possible plot twist could be that the father of the baby is not who everyone initially suspects. Maybe there's some mystery or misinformation about that. Another could be that Annabeth's pregnancy is part of a prophecy that no one saw coming, and it has far - reaching consequences for the whole world in the fanfiction universe. It could also be that her pregnancy is threatened by some dark force that has a vendetta against her or her unborn child.
A really interesting plot twist could be that the pregnancy isn't a normal one. It could be some sort of magical or alien - influenced pregnancy. For example, the baby might have powers from the very start of the pregnancy that start to show in strange ways, like affecting Videl's own abilities or causing strange events to happen around her.
One idea could be that the OC is a new neighbor who moves in near the family. Natsume initially seems cold to her, but as time passes, he starts to notice her kind heart and unique hobbies. They bond over shared love for books and late - night stargazing.
One great 'Brothers Conflict OC Sister' fanfiction is 'The New Sister in the Asahina Household'. It has an interesting plot where the OC sister brings a fresh dynamic to the family. The author does a wonderful job of portraying her character development as she navigates her new life with the brothers.
One possible plot twist could be that the pregnancy is a result of a magical spell gone wrong. Maybe a witch with a vendetta against them cast a spell that made Rebekah pregnant with Stefan's child as a way to disrupt their lives. Another could be that it's a false pregnancy caused by some dark entity preying on their fears of starting a family. This would add a lot of drama as they first deal with the shock of the pregnancy and then the realization that it might not be real.
Well, it could be that during the pregnancy, Rapunzel starts having strange dreams. These dreams could be premonitions about the future of their child. It could lead them to a hidden place or a new character who has crucial information about the baby. Also, Eugene could face a difficult decision. There might be a situation where he has to choose between protecting Rapunzel and the baby and fulfilling an important obligation to the kingdom. This would create a lot of internal conflict for him.