A possible plot could be that Yugi and Yami are under the influence of a love - inducing spell. They initially resist it but then give in to the feeling and kiss. Later, they have to figure out if their feelings are real or just because of the spell. Another idea is that Yami is about to be sent back to his own realm forever, and in a heart - wrenching goodbye, they share a kiss. And then there could be a plot where they are in a masquerade ball - like event in the Duel Monsters world, and not knowing each other's identities at first, they share a passionate kiss which then leads to a whole new exploration of their relationship when they find out who they really kissed.
One idea could be exploring how Yugi and Yami's relationship deepens during the pregnancy. Maybe they face challenges together like dealing with the reactions of their friends. Another could be the magical aspects of the mpreg in the context of their world, like how the pregnancy might be connected to the powers of the Millennium Items.
Perhaps a story where a lemon is the key to unlocking a hidden part of Yugi's and Atem's past. Yami, being connected to both, helps in the journey of discovery. They might encounter old enemies and make new allies as they follow the trail left by the lemon.
A more romantic plot could be that Yami Yugi starts having strange dreams about Dark Magician Girl. In these dreams, they seem to have a deep connection. As he tries to figure out what these dreams mean, he starts to develop real feelings for her in the waking world. But there are many obstacles in their way, like the fact that she is a magical being from the Duel Monsters world.
One plot idea could be a time - travel adventure where Yugi, Yami, and Atem are sent to a different era in the Yu - Gi - Oh universe. They have to use their combined skills to find a way back while also facing new and powerful opponents. Another could be a story where they enter a mysterious tournament that has strange rules and they must figure out how to win together. A third idea is a story where they discover a hidden power within the Millennium Items that only they can unlock through their unique bond.
One idea could be a magical pregnancy. Maybe a powerful spell backfires on Yugi or Yami, and as a result, they end up in a situation where they are about to become parents. This could lead to a whole adventure of finding a way to reverse the spell while also dealing with the emotions and changes that come with the unexpected pregnancy.
Well, for starters, in the original context, their relationship is more of a partnership. So, to introduce a romantic kiss, you have to carefully re - define their relationship without ruining the essence of what made their bond so great in the first place. The setting also matters. If you set it in the middle of a duel, it has to make sense in the context of the duel rules and the intensity of the moment. And then there's the issue of how it will affect the overall plot of the fanfiction. A single kiss can change the whole dynamic, and you need to be able to handle that change smoothly.
One interesting yami yugi fanfiction could be about his adventures in a modern world. Maybe he uses his ancient powers to solve modern mysteries. Another could be a story where he teams up with other characters from the series in a new and unexpected way.
One possible storyline could be a time - travel adventure where Yugi accidentally travels back to the era of Atem and has to find his way back with the help of Yami. Another could be a story where they have to team up to defeat a powerful new enemy that is threatening both the modern world and the spirit world. There could also be a more character - centered story where they explore their relationships and how they've changed each other's lives.
Maybe the baby is a key to a powerful spell. Yami Yugi discovers the baby and soon realizes that there are dark forces after it. So, he teams up with his friends to figure out the mystery behind the baby and how to keep it out of the wrong hands. They have to face many challenges along the way.
One interesting plot point could be the struggle of their relationship being accepted by others. Since Yami has a rather otherworldly origin, some people might be afraid or skeptical of their relationship. Another plot point could be Yugi's growth as a person because of Yami's love. He might become more confident and brave. Also, a plot point could be when they have to face a great danger together, which tests their love and makes it even stronger.