The plot could be about Atem protecting Baby Yugi. Maybe there are some dark forces in the spirit world that are after Yugi even as a baby, and Atem uses his powers to keep him safe.
Perhaps it's a more comical plot. Atem, not used to dealing with a baby, tries to take care of Baby Yugi. He might make all sorts of mistakes like not knowing how to change a diaper or make baby food, but in the end, he forms a really special bond with Yugi even at that young age.
It could be a story of Atem traveling back in time to when Yugi was a baby. He might be there to give Yugi some sort of important message or power that will help him in his future duels. He could be guiding Yugi's growth in a very subtle way, like influencing his love for Duel Monsters at such an early age.
One possible plot could be that in a world where magic has strange side - effects, Yugi or Atem accidentally get affected by a spell that results in a situation similar to pregnancy. It could be a story full of confusion and discovery as they try to understand what's happening to them and how to reverse it, while also dealing with the reactions of their friends and foes in the Yugioh universe.
A third theme could be the connection between different worlds or states of being. Atem is from the spirit world and Yugi is in the physical world as a baby. The fanfiction could explore how their relationship bridges these two different existences, and how they interact despite the differences in their natures and the worlds they belong to.
The main plot could be about Yami and Atem competing in a friendly way for Yugi's attention. Maybe they both try to be the one who helps Yugi the most in his dueling adventures.
Another idea is that the pregnancy is a symbol of a new beginning for Atem and Tea's relationship. They've been through a lot together, and this pregnancy forces them to grow even closer. They could face challenges like financial difficulties or disapproval from some of their friends or family, but they overcome them through their love for each other and their excitement for the new life they are bringing into the world.
One possible plot twist could be that Atem doesn't believe the baby is his at first. This could lead to a rift between him and Yugi until evidence proves otherwise. Another twist could be that there is some sort of magical or supernatural complication with the pregnancy. Maybe the baby has some special powers that put it in danger from other forces in their world.
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.
I'm not sure specifically what that particular 'atem x yugi rated m fanfiction' is about. 'Rated M' usually means it might contain mature themes like violence, strong language or some more complex emotional situations. But without reading it, it's hard to say more about the plot regarding Atem and Yugi.
Well, it could start with Yugi's initial shock and confusion. He might keep it a secret at first, trying to figure out how to handle this situation on his own. Then, as the pregnancy progresses, he would have to face the reality and start thinking about how Atem would react when he finds out. Maybe there would be some drama as Yugi tries to balance his normal life and this unexpected pregnancy.
One idea could be that Pharaoh Atem discovers Slave Yugi's hidden strength and intelligence despite his lowly status. He then decides to train Yugi to be his right - hand in strategic matters, much to the surprise of the court. As they spend more time together, a deep bond of friendship forms between them.
Typically, it involves taking the characters Atem and Yugi and creating a fictional scenario where one of them is male - pregnant (mpreg). It often plays with the relationship between the two characters in a new and different context, exploring their emotions and interactions in this unique situation.