Another plot twist could be that there is a misunderstanding. Sirius' actions, which are actually signs of his crush, are misinterpreted by Hermione as him just being overly protective like an older brother. So, when he finally gathers the courage to confess, she is completely shocked and has to re - evaluate all their previous interactions.
A plot twist could be that Hermione is initially oblivious to Sirius' feelings. She's so focused on her studies and the fight against Voldemort that she doesn't notice the signs. But then, one day, she accidentally stumbles upon a letter Sirius was writing about his feelings for her. This throws her into a state of confusion as she never expected such a thing from him.
In the fanfiction, Sirius having a crush on Hermione could also be due to her bravery. Hermione is not one to shy away from danger when it comes to protecting her friends or fighting for what's right. Sirius, who has also shown great courage throughout his life, might be attracted to this quality in her. Their relationship could develop in a more action - packed way. For example, during a battle against Death Eaters, Sirius might realize his feelings for Hermione as he sees her fearlessly casting spells. He could then start to leave little protective charms around for her, which she eventually discovers and starts to suspect his feelings.
Well, a common plot twist is the idea of soulmates. In some fanfictions, it is discovered that Hermione and Sirius are soulmates across different timelines or dimensions. This leads to their kiss as they are drawn to each other on a deeper level. Another plot twist could be a misinterpretation of prophecies. The fanfiction might have a prophecy that seems to point to Hermione and Sirius being together, which causes them to explore their relationship and end up kissing. Also, the idea of a parallel universe where the rules of the original story are different can lead to them kissing, such as a universe where age differences don't matter as much in relationships.
In some fanfics, a plot twist could be that Severus was actually protecting Hermione all along under Dumbledore's secret orders, and Sirius discovers this and has to re - evaluate his hatred for Severus. This completely changes the dynamic between the three.
One common plot twist is that Sirius is actually under a spell that makes him fall for Hermione, and she has to figure out how to break it while dealing with her own feelings. Another could be that they discover a prophecy that links their relationship to the fate of the wizarding world.
One possible plot twist could be that the marriage law forces them together initially, but they discover a deep, unexpected connection. For example, Sirius might initially be resistant as he sees Hermione as a young friend, but through shared experiences in the wizarding world, like fighting against dark forces together, they grow closer.
In a fanfiction where Sirius Black adopts Hermione Granger, a plot twist could be that the magical community doesn't accept this adoption easily. There could be a lot of opposition from different factions. Some might think that Sirius, with his past as a supposed criminal, isn't a suitable guardian. Meanwhile, Hermione could be facing problems at Hogwarts because of this new family situation. However, through their bond, Sirius and Hermione could overcome these difficulties and in the process, Hermione could learn some long - lost family magic from Sirius, which gives her an edge in dealing with the challenges that come their way.
Maybe Sirius Black gets frustrated with Hermione's know - it - all attitude in the fanfiction. He could be tired of her constantly correcting others or trying to take charge all the time.
A plot twist might be that Anko was once in love with someone else, and that person suddenly returns. Naruto would then have to compete not just with his own insecurities but also with this new rival. Or, it could be that Naruto's crush on Anko is part of a genjutsu placed on him by an unknown enemy. When he breaks free from the genjutsu, he has to re - evaluate his feelings for Anko, and Anko has to deal with the fact that Naruto's feelings were not entirely real at first.
Perhaps the baby's existence causes a rift in the wizarding world. Some might view it as an abomination due to the age and past relationship between Hermione and Severus. This could lead to Hermione and Severus having to fight not only for their baby's safety but also for their right to be a family in a world full of prejudice.
A possible plot twist could be that Naruto is oblivious to Sasuke's feelings at first. He might just think of her as a good friend and Sasuke has to work hard to make him see her in a different light.