Well, a possible storyline could be that Esdeath trains Tatsumi to be the perfect pet, which includes teaching him combat skills in her own brutal style. Tatsumi could initially resist but gradually become more and more like what Esdeath wants. This could also lead to a moral dilemma for Tatsumi as he starts to question his own identity and whether he is losing himself in the process of being her pet. There could also be a storyline where other characters try to rescue Tatsumi from Esdeath's clutches, creating a lot of action and drama.
If Tatsumi is Esdeath's pet in fanfiction, there could be a storyline where Tatsumi is forced to participate in Esdeath's cruel games. He might be made to fight other 'pets' or perform dangerous tasks for her amusement. Or, perhaps Tatsumi tries to use his position as her pet to gain information and eventually turn the tables on Esdeath, leading to a plot full of intrigue and suspense.
In certain fanfiction works, Tatsumi is indeed made into Esdeath's pet. This can be a way for writers to explore darker or more extreme versions of their relationship. It might involve Esdeath treating Tatsumi in a demeaning way at times, or it could also lead to a strange form of affection developing between them as the story progresses. It really varies from one fanfic to another.
Tatsumi would likely react with defiance. He's a brave character and wouldn't easily submit to Esdeath's kidnapping. He might try to fight back right away if he has the chance.
In this fanfiction, Tatsumi could be sent on a special mission that requires him to infiltrate Esdeath's inner circle. He disguises himself and gets close to her. Esdeath, who has a sixth sense for these things, suspects Tatsumi but plays along. As they interact more, there is an underlying tension between their opposing ideals, yet also an attraction that neither can fully understand or deny.
One possible plot could be that Tatsumi and Esdeath, after getting married, try to find a balance between their different ideals. Tatsumi, with his sense of justice, might influence Esdeath to be more empathetic towards the common people. They could face challenges from the political unrest in their world, and together they use their combined strength and influence to bring about positive change in their society. Also, their relationship could be a source of conflict among different factions who either oppose or try to use their union for their own gains.
One common theme is the struggle with their different personalities. Tatsumi is often portrayed as more kind - hearted, while Esdeath is cruel. So when she becomes pregnant, there might be a theme of her learning to be more empathetic. Another theme could be the protection of the unborn child, with Tatsumi taking on a more protective role.
In a fanfic like this, perhaps there could be a situation where Tatsumi and Esdeath are forced to work together on a mission. During this time, they have to rely on each other and Tatsumi starts to admire Esdeath's strength and leadership skills. These qualities, along with her beauty, might draw him in and make him realize his love for her.
I'm not sure specifically about 'lemon' fanfiction as it often involves inappropriate or adult - themed content. However, there are many regular Tatsumi and Esdeath fanfictions on various fanfiction platforms. You can try Archive of Our Own or Fanfiction.net and search for their relationship - based stories that are more in line with general storytelling and character exploration.
In a fanfiction where Esdeath kidnaps Tatsumi, one possibility is that she tries to force him to join her side. She might use various means like threats against his friends or promises of power. Tatsumi, being a hero at heart, would likely resist. He could try to escape while also trying to figure out Esdeath's weaknesses to defeat her later.
In a fanfiction where Tatsumi meets Esdeath early, one possibility is that Esdeath would immediately be intrigued by Tatsumi. She might see his potential and try to recruit him into her forces right away. Tatsumi, on the other hand, would likely be very cautious as he knows Esdeath's cruel nature. He might try to play along at first to avoid getting killed, but secretly be planning his escape.
In a fanfiction where Esdeath and Tatsumi are married, their life could be full of interesting dynamics. Esdeath, with her powerful and often cruel nature, would have to adjust to a more domestic life. Tatsumi, on the other hand, would need to deal with Esdeath's strong personality. Maybe they would have adventures together, with Esdeath using her skills to protect Tatsumi and Tatsumi teaching her about the value of life and kindness. Their relationship could be a mix of love and conflict as they come from very different backgrounds.