The character of Aku could be developed in a 'pregnant Aku in Samurai Jack fanfiction' by exploring how he interacts with the world around him differently. He may become more reclusive as he doesn't want others to see his 'weak' state. Or he could become more aggressive in trying to protect his pregnancy, which would be a new aspect of his character. Also, his relationship with his own power might change. Maybe he has to find new ways to use his magic that don't harm the unborn, which would force him to grow and adapt in ways he hasn't before.
One idea could be a crossover where Aku accidentally opens a portal to the Naruto universe. Naruto, being the curious and brave ninja he is, decides to explore Aku's world. They could start off as enemies, but gradually come to understand each other's motives and end up teaming up against a greater evil that threatens both of their worlds.
I'm not sure who Aku specifically is in this context. But if Aku tells sexy bedtime stories, it might be about fictional romantic or alluring scenarios. However, it's important to note that such stories should be appropriate and in line with ethical standards.
Well, without having read 'aku no joou no kiseki web novels', it's hard to give a detailed account. However, based on the title, it could potentially be a web - based novel that focuses on the story of a queen ('joou') in a world filled with elements of 'aku no', perhaps indicating a world of sin or darkness. The 'kiseki' part might suggest that there are some sort of miraculous or extraordinary events related to this queen's story.