I'm not entirely sure about the specific 'oro plata mata' story. It could be something specific to a certain region, culture or even a local folktale. Without more context, it's difficult to provide a detailed account.
The origin of the 'oro plata mata' story could be rooted in the history and culture of a specific group. It could have been passed down orally for generations, with the elements of gold ('oro'), silver ('plata') and death ('mata') having significance within that cultural context. Maybe it was a cautionary tale told to warn against the perils of excessive greed for precious metals. But without more research, it's hard to be certain.
The fanfic might center around the aesthetics of the wife in a kimono in the 'la cordo d oro' setting. The kimono could be described in great detail, with its colors and patterns playing a role in the story. Her relationship with other characters could be influenced by her appearance in the kimono. For example, she might attract the attention of certain characters, or it could be a source of pride or mystery in the story.
Well, first of all, the 'la corda d'oro' series has a rich backdrop of music and competition. When it comes to len and kahoko lemon fanfiction, it takes these elements and twists them into new stories. Fans are attracted to seeing how the relationship between Len and Kahoko can be different from what was shown in the original anime or manga. It could be a more romantic, angsty, or even comical take on their relationship. The fanfiction gives freedom to the writers to play with the characters' emotions and reactions, which makes it really appealing for those who are fans of the original work.
You could start by looking on popular fanfic websites like Archive of Our Own (AO3). They have a large collection of fanfics from various fandoms, so there's a chance you might find 'la cordo d oro wife kimono' fanfics there.
One popular 'la corda d'oro len and kahoko lemon fanfiction' story could be 'A Melodic Encounter'. It beautifully weaves their relationship with elements of music and emotion. Another might be 'Harmony of Hearts' which delves deep into their unspoken feelings. There's also 'Len and Kahoko: A Musical Bond' that focuses on how their shared love for music brings them closer.
Fanfiction should be inclusive and appropriate. When it involves elements like 'futa' which have adult connotations, it is not acceptable for general audiences. The 'Ben 10' franchise has a large fan base of different ages, and fanfiction should be made in a way that respects all fans. So, this kind of fanfiction is not suitable for all.
One great Shikamaru x Naruto time travel fanfiction is 'Back to the Beginning'. In this fic, Naruto and Shikamaru are sent back in time due to a jutsu gone wrong. It's really interesting to see how they use their future knowledge to change things. Another one is 'Time - Twisted Bonds' where they go back and have to deal with past enemies in new ways, with a great focus on their friendship development.