What are some interesting plots in a Supernatural fanfiction with a powerless Lucifer?

In this type of fanfiction, a powerless Lucifer might start to experience emotions in a more raw and human way. Without his powers, he's no longer the all - powerful being. He could become a target for his former enemies who see this as an opportunity for revenge. This could lead to a series of adventures where he has to rely on his wits rather than his strength. He might also start to question his own identity and purpose, which were so closely tied to his power before.

One idea could be that Lucifer has his powers stripped by a powerful spell cast by a group of witches. As a result, he's in a vulnerable state and some other characters, perhaps angels who have a bone to pick with him, decide to teach him a lesson in a rather unorthodox way like spanking. It could be a humorous take on the usually intimidating Lucifer.

A powerless Lucifer could survive among humans by using his charm and intelligence. He's been around for a long time and has a lot of knowledge. He could use that to blend in and perhaps find some humans who are willing to protect him out of pity or curiosity.

If in a Supernatural fanfiction Lucifer becomes powerless among humans, first of all, his entire view of the world would change. He has always been at the top of the power hierarchy, looking down on humans. But now, he's in their shoes. He'd likely be in a state of shock initially. Then, he might try to find a way to regain his power. But in the process, he could form unexpected alliances with humans. Some might see him as a fallen being in need of help, while others would be out to take advantage of his weakened state.

One interesting plot could be their adjustment to married life while still dealing with the supernatural elements in Lucifer's world. For example, how they handle his devilish powers and the reactions of those around them.

One interesting plotline could be their eternal struggle for power in a new, alternate universe created within the fanfiction. They might fight not just physically but also in the realm of manipulating other characters' loyalties.

One idea could be that Lucifer from 'Lucifer' ends up in the 'Supernatural' universe and teams up with the Winchester brothers to fight a common enemy, like a powerful demon that's causing chaos in both their worlds. Maybe he uses his charm and powers in a unique way to help them out.

One idea could be a fanfiction where Lucifer and Michael are forced to team up against a new, greater threat. Maybe an ancient evil that even their father couldn't have foreseen. They start off hating each other but as they fight side by side, they begin to understand each other's perspectives a bit more.

One interesting plot could be the Winchester brothers finally achieving a permanent peace in the afterlife. They've been through so much in the series, and in the fanfiction, they might get to rest without any new threats.

Another plot might involve Lucifer struggling with his own inner demons when he decides to declare his love. He's afraid that his love for Chloe might put her in danger. So, he tries to push her away at first. But Chloe is persistent and in the end, Lucifer overcomes his fears and declares his love in a very intimate and heartfelt moment.