@DreamyAutumnRose
I guess it depends on the story that's being written. In my story that didn't happen because I genuinely was not thinking about jealousy when I was writing it and the story covered more important things than jealousy, not to mention Seto had a lot on his mind after getting adopted that he wanted to solve first, so he wasn't thinking about Mokuba as much as Mokuba was thinking about Seto. I can see Seto getting jealous if it was due to a misunderstanding but solving it later due to all the KaibaCorp stuff going on.
I do like I didn't have a type of sibling rivalry/jealousy type thing going on because I think people would take it the wrong way. TTB has been added to a lot of guy x guy reading lists (honestly not sure if they GENUINELY think this story is gay, they have all the space taken up in a reading list, or they assumed the story was gay because a lot of Yu-Gi-Oh! stories are about gay shipping. It's also been added to x reader reading lists but that happens with a lot of stories) and something tells me that if I did write in a sibling rivalry arc that people would go crazy with it.....even though it was meant to be just jealousy if I did write an arc in.