Sure. There are many fanfics out there that involve these characters. You can start by looking on fanfiction platforms like Archive of Our Own. Some fanfics might focus on their battles, their character development, or their relationships in a non - romantic or non - inappropriate way.
One interesting storyline could be about Aizen's redemption. Imagine a fanfic where Ichigo and Rukia play a role in helping Aizen see the error of his ways. Another could be a story where they all have to work together to face a new, more powerful enemy that is threatening the Soul Society and the human world.
I'm not sure which specific one to recommend off - hand, but you can try looking on fanfiction.net. There are likely many 'Aizen Aslem Ichigo Rukia fanfic' there. You can search by tags like 'character relationships' or 'action - adventure' to find ones that might interest you.
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.
Sorry, I haven't come across such a specific 'Aizen hypnotizes Ichigo' fanfic myself. However, you could join Bleach - related fan communities on social media platforms. There, fans often share and recommend interesting fanfics, and you might find what you're looking for.
Rukia is also very popular. Her cool and composed nature, along with her powerful ice - based Zanpakuto abilities, make her stand out. Her backstory, being from the Soul Society and her connection to Ichigo, gives writers a lot to work with in terms of character development and plot.
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.
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.
One possible storyline could be a story where Ichigo and Rukia have to team up against Aizen's new scheme. They gather a gang of their friends and allies from the Soul Society and the human world. They train together, combining their powers in unique ways to face Aizen's powerful minions. Along the way, there could be some character development for each member of the gang, like Ichigo learning a new form of his Zanpakuto through the guidance of an old Soul Reaper in the group.
I'm not sure about specific 'ixhigo x aizen' fanfics. You can try searching on popular fanfic platforms like Archive of Our Own or Fanfiction.net. They have a wide range of fan - created works, and you might be able to find something related there.
One of the things that can make it interesting is the exploration of different character arcs. Aizen's obsession can be a catalyst for Ichigo and Rukia to grow in ways they might not have in the original story. It can also bring out different sides of their personalities. For example, Ichigo might become more determined to protect Rukia from Aizen, showing a deeper level of his loyalty. Rukia, on the other hand, could develop new strategies to deal with Aizen's threat, highlighting her intelligence and resourcefulness. Additionally, the fanfic could introduce new settings or concepts related to Aizen's obsession, such as alternate dimensions or new forms of power, which can keep readers engaged.