Well, a plot twist might be that Regina's pregnancy is a false one, created by an illusion spell. This could be part of a larger scheme to make her look vulnerable and draw out her enemies. Or perhaps the baby she's carrying has some sort of special power that she has to protect it from other magical beings who want to use that power for their own gain. Also, it could turn out that the pregnancy is a result of time - travel shenanigans, where she got pregnant in a different time period and now has to deal with the consequences in her current time.
A possible plot twist is that the OC discovers that the pregnancy is not a natural occurrence but the result of some dark magic manipulation by an unknown enemy. This would make Regina and the OC go on a quest to find out who is behind it and how to reverse it if necessary. Meanwhile, they have to deal with the emotional turmoil of not knowing if the baby will be okay and whether they can trust their own feelings for each other.
Snow White might be initially suspicious, given their past history. But she could also show a more empathetic side and try to help Regina. Hook might be amused and make some snarky comments at first, but then offer his protection. Rumpelstiltskin could see it as an opportunity to manipulate Regina further, perhaps by offering her magic to ensure a safe pregnancy in exchange for favors.
One possible plot could be that the other characters in Storybrooke have to deal with the power vacuum left by Regina's death. Maybe her son Henry would struggle with his identity more as he no longer has his mother as an anchor. The Evil Queen's spells could start to go haywire without her there to control them, causing chaos in the town.
The relationship could become stronger. Regina, who has had a difficult past, might find new hope and softness in the idea of having a family with the OC. They could start to rely on each other more, sharing fears and hopes about the future. For example, Regina could open up more about her own past traumas related to family, and the OC could comfort her, creating a deeper bond.
A possible plot could be about a lemon that has magical powers. It might live in a world where fruits have their own society. The lemon could go on an adventure to find a special ingredient to save its ill friend in the orchard.
One possible plot could be that Regina and Sydney start off as reluctant allies. Maybe they are both trying to achieve something in the town of Storybrooke. For example, they might be looking for a magical artifact that could change the balance of power. Along the way, they discover that they have more in common than they thought. Sydney might be able to see past Regina's tough exterior and understand her motives, which are often a mix of self - preservation and a longing for something she lost in the past. As they search for the artifact, they face various obstacles, like other characters who also want the item for their own purposes. This could lead to some tense moments and action - packed scenes as Regina and Sydney have to use their wits and magic (if applicable) to outmaneuver their opponents. In the end, their relationship could develop into a true friendship, or perhaps something more, depending on the direction the fanfiction takes.
Maybe Emma is actually from an alternate timeline where Regina was the one who sent her to our world for a greater purpose. As the story unfolds, this revelation makes Regina question her own motives and actions towards Emma throughout their time together.
One possible plot could be that they initially had a complex relationship filled with misunderstandings. But as they grew closer, an unexpected moment of passion led to Emma getting pregnant. Then they would have to face the reactions of their friends and family in their fictional world, and struggle to figure out how to co - parent in the midst of all the chaos.
Perhaps the plot could involve the reader being in some kind of danger or distress, and Hook uses tickling as a way to cheer them up. For example, the reader has had a bad encounter with a villain in Storybrooke, and Hook takes them to a secluded spot by the docks and tickles them to make them laugh and forget their troubles. It could also lead to a deeper emotional connection between them as they share this intimate moment.
One possible plot could be that August has some important information to share with Emma about her past or the impending danger in Storybrooke. Maybe he stays with her to protect her from the villains who are after her powers. For example, he could know about a new curse that is about to be cast and needs to keep her safe until they can figure out a way to stop it.