In such a fanfic, the captured scenario could lead to some great character development. For Ichigo, it might be a test of his strength and resolve. He could discover new aspects of his powers while trying to escape. Aizen, being captured, might show a different side of himself, perhaps a more desperate or calculating side. Irukia might use his friendship with Ichigo to boost their morale. The interactions between them would be filled with tension and drama, as they deal with the captivity and whatever threats are associated with it.
Well, in a fanfic where these characters are captured, there could be a lot of intense situations. Maybe Aizen, being the crafty character he is, would try to manipulate the situation to his advantage. Ichigo, on the other hand, would probably be looking for a way to break free and fight back. And Irukia might be using his cool - headedness to assess the situation and come up with a plan. They could also be forced to work together against a common enemy in the fanfic, which would be an interesting dynamic considering their different personalities and powers.
A plot twist could be that the place they are captured in is not what it seems. It could be a magical or illusionary prison created by an unknown force. This would make their escape much more difficult as they have to figure out the true nature of the prison. Also, it could turn out that their capture was a self - fulfilling prophecy. Maybe Aizen's actions in the past led to a chain of events that resulted in their capture, but in a way he didn't expect. And Irukia could be the key to their escape, but he doesn't realize it until later in the fanfic.
Ichigo would likely be defiant. He's a fighter and would not easily submit to Aizen. He'd probably be constantly looking for a way to escape and would be sizing up Aizen's every move, trying to find a weakness.
One possible plot could be Ichigo's struggle to escape Aizen's prison while also trying to figure out Aizen's true motives for capturing him. Maybe he discovers some dark secrets about Aizen's past during his captivity. Another plot could involve his friends trying to rescue him and the battles they face against Aizen's minions on their way to save Ichigo.
In this fanfiction, Ichigo might be held in a secret location by Aizen. Aizen could be planning to use Ichigo for some dark experiment or to gain his power. Maybe he'll try to manipulate Ichigo's Hollow side for his own evil purposes.
One idea could be that Aizen kidnaps them to use Ichigo's power and Rukia's knowledge of Soul Society for his own dark plans. He might want to study Ichigo's unique Hollow - Shinigami powers up close and use Rukia as a bargaining chip with Soul Society.
You can try searching on popular fanfic platforms like Fanfiction.net or Archive of Our Own. Just use the keywords 'Aizen - Obsessed Ichigo Rukia' in their search bars, and you might find relevant fanfics.
One common theme is the power struggle. Since Aizen is a very powerful character, and Ichigo (even as a female version) has her own strength. Their interactions often involve a push - and - pull regarding power. For example, in many fics, the female Ichigo tries to resist Aizen's control.
Aizen might be motivated by power. Ichigo has a very unique power set that Aizen may want to harness for himself. And Rukia, being from Soul Society, could be used as a way to gain information or leverage against Soul Society.
Well, in 'ichigo and fem aizen lemon fanfiction', Ichigo is often the more emotional and impulsive one. His reactions to Fem Aizen's actions and presence are key elements. He might be drawn to her in a way that challenges his sense of right and wrong. Fem Aizen could be depicted as having a seductive allure that she uses to her advantage. She might also have a more complex backstory related to her femininity in this fan - created world. Her relationship with Ichigo is usually full of tension and a sort of forbidden attraction due to their different natures and the history between Aizen and Ichigo in the original Bleach storyline.
One possibility is that the captains start to question their own beliefs and power levels. Ichigo, being a substitute Soul Reaper, is taking on Aizen, a very powerful foe. This could make the captains realize that there are other ways to gain strength beyond the traditional Soul Reaper training. They might also start to see Ichigo as a potential ally in future battles against greater threats.