Maybe the kiss is part of a spell or a curse. In the world of H2O, there could be some magical force at play. The kiss was meant to transfer powers or memories between them. So, instead of a normal romantic kiss, it becomes a catalyst for a whole new adventure or problem they have to face together.
One possible plot twist could be that the pregnancy is not as straightforward as it seems. Maybe there are some magical or supernatural elements involved in Bella's pregnancy that Will has to figure out. For example, it could be that an ancient spell has been cast on Bella which causes her pregnancy, and this spell has some hidden intentions or consequences that will unfold throughout the fanfiction.
A possible plot could be that they become friends and start a project to educate humans about mermaids in a non - romantic way. They could work together to create a school program or something similar. For example, Will could bring in his schoolmates and Bella could show them some of her mermaid abilities in a safe and educational setting.
One challenge could be communication. Since Bella is a mermaid and Will is a human, they might have different ways of expressing themselves. For example, mermaid language and signs might be difficult for Will to understand at first. Another challenge could be dealing with the different laws and rules of their two worlds. Mermaid society might have rules about interacting with humans that Bella has to navigate while Will might face problems in his human world if he is seen spending too much time with a'mysterious girl' like Bella.
The kiss might lead to a change in Thor's relationship with other characters. If Thor has a love interest like Jane, the kiss with the Enchantress could create jealousy and conflict. It could also make Thor question his own feelings and loyalties. He might be drawn to the Enchantress' allure but also feel guilty about betraying his friends or his true love.
One possible plot twist could be that the kiss is part of a genjutsu. Maybe an enemy has put Naruto under a genjutsu, making him see Tayuya in a different light and be compelled to kiss her. When he breaks free from the genjutsu, he has to deal with the confusion and guilt.
One possible plot twist could be that their kiss is part of a spell gone wrong. Maybe they were trying to combine their powers to defeat a powerful enemy, and the magic misfired, resulting in an unexpected kiss. This could lead to a series of comical and confusing events as they try to figure out how to reverse the spell without losing their newfound closeness.
Perhaps the kiss is a result of some magical or psychic Pokémon's influence. For example, a Psychic - type Pokémon might be playing matchmaker and uses its powers to make Ash and Iris kiss. But then, when they realize what has happened, they have to decide if they actually have feelings for each other on their own, without the Pokémon's interference.
Well, a plot twist could be that Loki kisses Darcy as a way to gain access to something she has. Like, she has a key or a piece of information that he needs. But then, he actually starts to develop real feelings for her during the process. It adds an interesting layer of conflict, between his initial motives and his newfound emotions.
One possible plot twist could be that their kiss is part of a magical spell gone wrong. Maybe Ursula was trying to steal Ariel's voice again with a new spell, but instead, the spell backfired and made them kiss. This could lead to a strange alliance between them as they figure out how to reverse the spell.
One possible plot twist could be that their kiss is a ruse. Maybe Ramsay is using the kiss as part of a cruel game to manipulate Theon further. He could be trying to gain Theon's false trust to set him up for an even more devious plan later. Another plot twist might be that Theon kisses Ramsay back out of a sense of Stockholm Syndrome, believing that this is the only way to survive in Ramsay's clutches. And finally, it could be that the kiss is a moment of true connection in a very dark and complex relationship, leading to a change in both of their characters as they struggle with their feelings for each other in the midst of all the horror around them.