One possible plot twist could be that a long - lost relative of Bella shows up and tries to stop the wedding because they have some dark secret about the Cullens. Another could be that a new vampire coven arrives and challenges the Cullens right before the wedding, forcing Bella and Jasper to postpone it while they deal with the threat. Maybe there's also a twist where Bella discovers a new power within herself on her wedding day that changes the whole dynamic of the relationship with Jasper and the Cullen family.
Well, it could be that the Volturi find out about the wedding and come to Forks. They claim that the marriage between Bella and Jasper violates some ancient vampire law. This would put the Cullens in a difficult situation as they have to either fight the Volturi or find a way to prove that their marriage is acceptable. It would add a lot of drama and tension to the fanfiction story.
A plot twist could be that Jasper has a pre - wedding vision (if he has some sort of precognitive ability in the fanfiction) that shows a disastrous future if they get married. So he has to decide whether to go through with it or not. Or perhaps Bella is turned into a vampire just before the wedding in an unexpected way, like being attacked by a rogue vampire, and she has to quickly adapt to her new state and decide if she still wants to marry Jasper as a vampire.
Another idea is that the fanfiction could be a dark, alternate universe story where Jasper has turned evil. His reasons for kidnapping Bella could be tied to some sort of revenge plot against the Cullens. He might hold a grudge against them for something that happened in the past, and Bella is just a means to get back at them. This would create a very different dynamic compared to the original Twilight story.
One possible plot twist could be that the pregnancy is not a normal one. Maybe there are some special powers or abilities that the baby inherits which causes all kinds of chaos and challenges. For example, the baby could have the power to manipulate time like Alice, but it's out of control in the womb and affects the flow of time around them.
One possible plot twist could be that Sakura discovers Kakashi has a secret past she never knew about. Maybe he was involved in some kind of dangerous mission long ago that has consequences in the present. This could put a strain on their relationship as she tries to come to terms with this new information.
One possible plot twist could be that just before the wedding, Ayame discovers a long - lost relative who has some dark secrets about Kouga's family. This relative tries to stop the wedding by revealing these secrets to Ayame. Another could be that on the wedding day, an old enemy of Kouga shows up and challenges him to a fight, putting the wedding on hold. Or perhaps there is a misunderstanding where Ayame thinks Kouga has betrayed her trust in some way, like he made a deal with an enemy for the sake of the tribe but didn't tell her.
Maybe Hikari suddenly gets an amazing job opportunity in a far - off place. This would force them to decide between following Hikari's career dreams and staying in their current comfortable life. It could lead to some really emotional and tense moments in the fanfiction.
One possible plot twist could be a long - lost relative showing up at the wedding and revealing a family secret that threatens to stop the marriage. For example, if there's a feud in the family that was hidden from Heiji and Kazuha.
One possible plot twist could be that their marriage is part of a larger plan to infiltrate an enemy organization. They pretend to be a happily married couple but are actually gathering intel. Another could be that Neo's past catches up with her during the wedding, and they have to deal with old enemies trying to disrupt the celebration.
One possible plot twist could be that they face opposition from the Hidden Leaf Village. Since same - sex relationships might not be as openly accepted in the traditional ninja world. Another twist could be that they have to go on a dangerous mission together right after getting married, which tests their new relationship. And perhaps there's a secret enemy who wants to break them apart because their union represents a new kind of hope in the village.
Well, perhaps a plot twist could be that Naruto gets cursed. This curse makes him forget all about Ino and their relationship. Ino then has to go on a journey to find a way to break the curse. Along the way, she might face many challenges and meet new characters who either help or hinder her. Or maybe there's a twist where it's revealed that Ino was arranged to be married to someone else in her family long ago, and she has to fight against the family traditions to be with Naruto.
A third plot twist could be the appearance of an old enemy from either of their worlds. For instance, if one of Naruto's old foes teams up with an enemy from Esdeath's world. They would then have to put aside their differences and work together to defeat the common enemy, which could either strengthen or strain their marriage.