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.
Another scenario could be that Esdeath uses her power and charm to pursue Tatsumi. She might be very direct in her affections, which at first makes Tatsumi uncomfortable. But over time, he finds himself falling for her unique personality. Esdeath could also protect Tatsumi from danger, which makes him see her in a new light and develop feelings for her.
Tatsumi might also face opposition from his friends and allies. They would likely be very suspicious of Esdeath and not understand why Tatsumi is falling for her. His friends could try to convince him that she's not good for him, which would put a strain on his relationships with them as well as his new - found feelings for Esdeath.
One possible scenario could be that they meet in a very unexpected place, like a small coffee shop during a rainstorm. Darien is immediately drawn to Serena's beauty and kindness. Another scenario might be that they are forced to work together on a project, and as they spend time together, Darien realizes his feelings for Serena are growing.
You can try looking on some fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfics, and you might be able to find Esdeath and Tatsumi - related ones there. However, make sure to follow the site's rules and regulations.
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.
The popularity might stem from the complex relationship between Esdeath and Tatsumi in the original 'Akame ga Kill!' anime. Their dynamic, with Esdeath being a powerful and somewhat cruel character and Tatsumi being the more idealistic hero, creates an interesting contrast that fanfic writers like to explore further in a romantic or more adult - themed context (while still keeping it within the boundaries of fanfiction).
One possible scenario could be that Ginny and Harry are in the Gryffindor common room. Ginny has had a long day of Quidditch practice and studying. She sits next to Harry on the couch, and as they are chatting softly about their day, her eyes start to droop. Harry notices but doesn't want to disturb her, and soon she falls asleep on his shoulder. Harry then just sits there, feeling a warm sense of protectiveness and contentment.
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 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.
They have a complex and intense relationship. Esdeath is attracted to Tatsumi's strength and determination, but their立场 and goals are completely opposite.
In 'Akame ga Kill', Tatsumi and Esdeath's relationship is complex. Esdeath falls deeply in love with Tatsumi. However, Tatsumi is on the side opposing Esdeath's cruel ways. Esdeath's love is intense but possessive. She tries to make Tatsumi hers, but Tatsumi is committed to his comrades and the revolution. Their love story is tragic as they are on opposite sides of a great conflict.