One possible storyline could be that Merlin makes a serious mistake in his magic that endangers Camelot, and as a form of punishment, he gets spanked. Another could be that he disobeys Arthur's direct order in a situation where it really matters, and this leads to the spanking as a disciplinary action. Maybe he accidentally reveals a secret that was crucial to keep, and the spanking is a way for the other characters to show their disappointment and enforce discipline.
Arthur could be the one to spank Merlin. Given their relationship where Arthur is the king and Merlin is his servant, if Merlin does something that Arthur believes is a serious offense against Camelot or his own authority, he might take this rather unorthodox form of punishment. Arthur is known for his hot - headedness and quick decision - making, so in a fit of anger, he could do it.
One possible storyline could be that Jack has made a serious mistake in the world of the Guardians. Maybe he endangered the other Guardians or put some important mission at risk, and as a form of discipline, he gets spanked. For example, he might have recklessly led Pitch to their secret hideout. Another could be that in a more domestic setting within the Guardian's realm, he breaks some important rules and is punished this way. It could also be that he's being taught a lesson about responsibility towards the children they protect, and the spanking is a rather extreme but effective way in the context of this fanfiction world to make him understand.
Well, there could be themes of responsibility. With Merlin being pregnant, Gwaine would have to step up and take on new responsibilities. There might also be a theme of facing society's reactions. If this is set in the Merlin universe, the medieval - like society might have strong opinions about an unmarried pregnancy. Additionally, there could be a theme of friendship being tested, as their friends might react in different ways to this situation.
One possible scenario could be that Draco misbehaves in a way that goes against the rules of the wizarding world or his family's expectations. For example, he might have been caught using dark magic inappropriately, and as a form of punishment, he gets spanked. Another scenario could be that he angers a powerful wizard or witch who decides to discipline him in this way. It could also be a more light - hearted situation where his friends play a prank on him that goes wrong, and he ends up in a situation where he 'gets spanked' as part of the comical chaos.
Well, one possibility is that Merlin's friends, like Arthur, might search desperately for a cure. They could go on a dangerous quest to find a rare herb or consult a powerful sorcerer who might know how to save him. Another could be that Merlin, while poisoned, has strange visions or dreams that give him clues about his true destiny or the future of Camelot.
Maybe the petting triggers a magical transformation for the fox or reveals a hidden power within it. This could take the story in a fantasy direction.
One possible storyline could be about how Tsunade deals with the unexpected pregnancy in the context of her leadership role. She might have to balance her duties and the changes in her personal life.
One possible storyline could be the challenges Bella and Edward face as they prepare for a new life together while dealing with the vampire - human relationship issues. Maybe they struggle to keep Bella safe during her pregnancy considering her human frailty.
One possible storyline could be that Harry is cursed by a dark wizard. The curse has the unexpected side - effect of making him pregnant. He then has to search for a way to break the curse while dealing with the physical and emotional turmoil of pregnancy. Another could be that it's a result of some experimental magic gone wrong. He might have been trying to help someone with a fertility spell and it backfired on him.
It could potentially have a theme of redemption. Nico might be atoning for past mistakes through this experience. Or it could be about learning boundaries, both for Nico and for the person administering the spanking. The story could show how these boundaries are set, crossed, and then re - established in the context of the fictional situation.