A plot idea could be that a new, powerful and dangerous Duel Monsters - like card has emerged on the black market, and it's causing chaos in the city. The police call in Yugi and Kaiba, who are known experts in the Duel Monsters world. They have to work together to track down the source of these cards and stop whoever is using them for malicious purposes.
Perhaps there's a criminal who is using Duel Monsters technology to hack into important systems in the city. Yugi and Kaiba are brought in to understand the technology behind it since they are familiar with the Duel Monsters mechanics. They start from the Duel Monsters tournaments and clubs in the city, following the leads to find the mastermind behind the hacks. Along the way, they face many challenges and have to put aside their differences to succeed.
One possible fanfiction could be about Kaiba and Yugi teaming up to solve a mystery in the city that the police are having trouble with. Maybe there's a series of strange disappearances and their unique skills, Yugi's strategic thinking from his Duel Monsters experience and Kaiba's technological know - how, help them crack the case.
One idea could be exploring how Yugi's friends react to the news. Some might be shocked, while others could be extremely supportive. Another could be the challenges Yugi faces during the pregnancy, like dealing with morning sickness and hormonal changes.
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.
A possible plot could be that the reader is a new duelist in the Duel Monsters world and catches Seto Kaiba's attention during a tournament. He's initially dismissive but as he sees the reader's unique dueling style and determination, he becomes intrigued and a rivalry - turned - friendship - turned - romance starts to develop.
One idea could be that Seto Kaiba, while on a business trip, stumbles upon a place where Tea is performing a dance routine (like in her Baby form). He's initially dismissive but then gets intrigued by her determination. Another could be that they get paired up for a duelist - dancer event where they have to work together to win, and during the process, they start to understand each other better.
Well, 'Kaiba's Redemption in Yugi's World' is a great one. In this fanfiction, Kaiba finds himself in a situation where he has to rely on Yugi's kindness and friendship more than he ever thought he would. 'The Kaiba - Yugi Rivalry Turned Friendship' is also quite popular. It shows how their intense rivalry gradually morphs into a strong bond of friendship as they face various challenges together. And 'Yugi's Influence on Kaiba' is about how Yugi's positive attitude starts to change Kaiba's rather cold and calculating nature.
One popular 'yugi x kaiba fanfiction' story could be 'Duel of Hearts'. It often explores their complex relationship through the lens of their duels and the underlying respect they have for each other. Another might be 'Beyond the Cards' which delves into a world where their rivalry takes on new dimensions outside of the Duel Monsters arena.
One idea could be female Yugi becoming a powerful duelist and competing in international dueling tournaments. She could face off against opponents from different cultures and use unique strategies.
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.
There are fanfictions where Yugi and Kaiba find themselves in an alternate dimension. Yugi's kind - hearted nature and Kaiba's determination create an interesting dynamic as they try to find their way back home. They gradually learn to understand and rely on each other more than they ever thought they would.