One possible plot could be that a rival group of Kenshin's enemies kidnaps Kaoru to lure him into a trap. They might hold her in an old, abandoned building. Kenshin would then have to use his skills and enlist the help of his friends like Sanosuke to find her. The kidnappers could demand that Kenshin give up his sword in exchange for Kaoru's safety.
In the fanfiction, it could be that a group of bandits who have heard of Kenshin's reputation and know about his relationship with Kaoru, the nurse, decide to kidnap her. They think they can ransom her for a large sum of money or use her as a bargaining chip to get Kenshin to do their bidding. Kenshin, being the honorable man he is, would not rest until he finds Kaoru and rescues her from their clutches. He would use his incredible swordsmanship and his sharp mind to track down the kidnappers.
Well, perhaps in this fanfiction, a new villain emerges who has a vendetta against the dojo. This villain sees Kaoru as an easy target since she's a nurse and often alone at the dojo taking care of the injured. He kidnaps her to disrupt the peace in the area and force Kenshin to face him. Kenshin would then start his search, following the few clues left behind at the dojo.
Kenshin would be extremely worried. He'd immediately start looking for her. He has a strong sense of justice and protectiveness towards Kaoru. So, he'd use his Battousai skills to track down the kidnappers as quickly as possible.
There could potentially be such a fanfiction, but it's not a very common or well - known trope in general fanfiction. It really depends on the fandom or the creative minds of individual fanfiction writers. Maybe it exists in a very niche or specialized area of fan - created works. You might also consider reaching out to fanfiction communities or forums to ask if anyone has heard of or read such a story.
One possible plot could be that Kenshin is sent to a future where his past actions have had far - reaching consequences. Maybe his vow to not kill has inspired a new generation of warriors, and he has to adapt to a world where his skills are both revered and feared in new ways.
I'm sorry, but I can't recommend lemon fanfiction as it often contains inappropriate or adult - themed content. However, you can try looking for general Rurouni Kenshin and Kaoru fanfiction on popular fanfiction websites like FanFiction.net or Archive of Our Own. There are many well - written stories that focus on their relationship in a more appropriate way.
One idea could be the challenges they face in preparing for the baby. Maybe Kenshin is worried about protecting his family from his past enemies. Another could be how Kaoru adjusts to her changing body and emotions, and they both learn to rely on each other more. They could also have heart - to - heart talks about their hopes and fears for their child's future.
One theme could be the cultural aspects of the Rurouni Kenshin world. Their relationship could be explored in the context of the Japanese culture of that time. For example, how their interactions are influenced by traditional values and customs. Additionally, the theme of redemption might be there. Kenshin is a character with a past full of bloodshed, and Kaoru could be seen as a symbol of his path towards redemption, and this could be a central theme in many fanfictions.
Kaoru could be the one who always prepares barley tea for everyone at the dojo. It becomes her signature thing, and whenever the characters smell barley tea, they think of Kaoru.
One plot idea could be that the kidnapper has a personal vendetta against Kaoru. Maybe Kaoru witnessed something she shouldn't have, and the kidnapper wants to keep her quiet. Another idea is that it's a case of mistaken identity, and the real target was someone else in the same hospital. A third idea could be that a deranged fan of Kaoru's kidnaps her in an attempt to make her their own, thinking they can 'protect' her from the outside world.
Well, it could be that Okashira has some strange motives for kidnapping Kaoru. Maybe he's jealous of Kaoru's popularity or something else in the fictional world. He might be planning to use Kaoru to gain something, like information or power within the story's context.
It could be a jealous coworker. Maybe they feel that Kaoru is getting all the attention or a promotion they wanted. Another possibility is a patient who has become obsessed with Kaoru during their treatment. Or perhaps it's someone from Kaoru's past who has a grudge against her.