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.
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 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.
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.
Sure. 'Rurouni Kenshin' has roots in real - life stories. The historical backdrop of the Meiji Restoration in Japan provides a lot of context. There were real samurai and assassins at that time. The story of Kenshin, who was once an assassin and now tries to atone for his past, can be seen as a fictional exploration of the ideas of redemption and change in that historical setting. The anime and manga use real - life historical elements to create a vivid and engaging fictional world.