One possible plot twist could be that their families oppose the marriage at first. Maybe Ranma's father has some old feud with Ryoga's family that they need to overcome. Another twist could be that a third character, who has feelings for either Ranma or Ryoga, tries to break them up. For example, Akane might realize she still has feelings for Ranma and tries to stop the wedding.
A plot twist could be that Ryoga discovers a long - lost family secret that makes him question whether he should marry Ranma. It could be something like he's actually from a different clan with some special obligations that conflict with the marriage. Or perhaps Ranma gets cursed in a new and strange way just before the wedding that changes their relationship dynamics.
One idea could be that they have to deal with the challenges of impending parenthood while still having their usual identity - switching mishaps. For example, Ranma might switch into his female form at an inconvenient time during the pregnancy, causing all sorts of comical and yet heart - warming situations as they figure out how to handle it together. Another plot could be that Ryoga discovers a new sense of responsibility and tries to build a proper home for their future family, all while Ranma is dealing with the physical and emotional changes of pregnancy.
One idea could be that Girl Ranma and Ryoga are forced to team up for a school project. They initially bicker a lot, but as they work together, they start to understand each other better. For example, Ranma might learn about Ryoga's insecurities when it comes to his sense of direction, and Ryoga could see that Ranma is not as tough as she seems on the outside.
One possible plot twist could be that Gaston has a change of heart and realizes the error of his ways. He starts to see Belle not just as a trophy to be won, but as a person with her own dreams and desires. This newfound understanding could lead to a more complex relationship where he tries to make amends for his past behavior and truly win her heart in a more honorable way.
One possible plot twist could be that Lily marries Snape out of a sense of duty. Maybe she discovers some long - hidden secret about Snape's past that makes her feel obligated to stand by him. For example, if she finds out that he made a great sacrifice for her family in the past that no one else knew about. Another plot twist could be that it's a marriage of convenience. The wizarding world is in danger, and their union is seen as a way to bring two powerful magical lineages together to fight against a common enemy. Or perhaps Snape has some unique magical ability that Lily needs in order to achieve a certain goal, and marriage is the only way to access it.
Another plot twist could be that an enemy uses their relationship against them. The enemy could spread rumors or false information to create chaos and turn the ninja world against them. Naruto and Sasuke would then have to fight not only to protect their relationship but also to clear their names and prove that their love doesn't mean harm to the ninja world.
One possible plot twist could be that the Stark she marries has a secret power or ability. Maybe he can communicate with animals like some Starks in the lore. This would add an interesting dynamic to their relationship as Rhaenyra comes from a different world in terms of magic and abilities. It could also lead to political intrigue as other houses might be jealous or fearful of this union and the new powers it could bring.
One possible plot twist could be that they suddenly discover a long - lost family secret that threatens their marriage. For example, it could be revealed that their families have an ancient feud that was forgotten over time. Another twist might be that a new character arrives, someone from Ranma's past who claims to be his betrothed from a prior arrangement. This would create a lot of drama as Ranma and Akane would have to deal with this unexpected situation. Also, there could be a magical or supernatural element involved. Maybe a curse is placed on their marriage that makes them forget why they fell in love in the first place, and they have to go on a journey to rediscover their feelings.
One great 'Ranma Ryoga Lemon Fanfiction' is 'The Unlikely Bond'. It beautifully explores the complex relationship between Ranma and Ryoga in a creative way that stays true to their characters while adding new and interesting plot twists.
I'm not sure specifically about 'lemon' (which often implies inappropriate or adult - themed content) fanfiction for Ranma and Ryoga. However, there are many great Ranma 1/2 fanfictions that focus on their friendship, rivalry, and character development in a more general and appropriate way. You can check out fanfiction platforms like FanFiction.net or Archive of Our Own and search for Ranma and Ryoga - related stories there.
One great 'Female Ranma Ryoga' fanfiction is 'The New Path'. It explores an alternate universe where Ranma stays as a female and her relationship with Ryoga takes an interesting turn. The story has great character development and a unique plot.