Maybe in the fanfiction, there could be a spell gone wrong that causes Lily to forget her relationship with James and fall in love with Harry instead. Harry, at first, is shocked but then realizes that he has a chance to be with his mother in a different way. The story could then follow their journey of dealing with the confusion and the consequences of this new relationship, including how it affects the prophecy and the fight against Voldemort.
In this fanfiction, a magical object could play a role. For example, a mirror that shows Lily what could have been if she had made different choices. Through this, she starts to see Harry in a new light and they start to bond. Their relationship could develop as they try to figure out how to change the future together, and also face the challenges from those who oppose their relationship, like the Order of Phoenix members who might find it morally wrong.
One plot idea could be that Harry discovers a hidden diary or memory of Lily Evans that has something to do with a lemon - scented charm she was working on. This could lead him on a journey to understand more about his mother's magic and her relationship with certain elements in the wizarding world. Maybe the lemon - scented charm has some special power that can help Harry in his fight against the dark forces.
One plot idea could be that James and Lily are brought back to life briefly and they meet Harry at a crucial moment in his fight against Voldemort. They offer him words of wisdom and strength that he didn't have before, which gives him an edge in the final battle.
A possible plot could involve an alternate universe. In this universe, Lily doesn't end up with James Potter. Harry, being from his own universe, arrives in this one and meets Lily. They initially bond over their shared magical abilities and a sense of not quite belonging. As they spend more time together, they develop feelings for each other, which is a huge shock to Harry at first as she is his mother in his own universe.
A great plot idea is that Sirius and Lily form an alliance to protect James Potter. Sirius, being James' best friend, and Lily, being James' future wife. They could have adventures together, facing off against Death Eaters even before the full - blown war starts. It could also be a story where Lily's kindness starts to rub off on Sirius, and he begins to change some of his more reckless ways. For example, he might start to study more seriously under Lily's influence. This could lead to some really interesting character development for both of them.
One unique plot idea could be that Lily Evans is somehow able to communicate with Harry through a special magical object. For example, a mirror that was enchanted by Lily long ago. This could allow her to give him advice and guidance during his adventures at Hogwarts. Another idea is that Lily's ghost lingers in a way that only Harry can see, and she helps him uncover secrets about the wizarding world that were lost over time.
For Harry, it would be a very complex development. He would have to grapple with the fact that he is in a relationship with his mother, which goes against all normal family and social norms. He might become more conflicted about his identity and his place in the wizarding world. For Lily, she would have to adjust to this new relationship that is so unexpected. She might become more protective of Harry in a different way than a motherly way, and also face criticism from others.
Another interesting plot could be that they are sent forward in time instead. They have to adapt to the future wizarding world which has changed a great deal. They might be shocked by new magic technologies and different social structures, and their reactions to these changes can make for an engaging story.
There are fanfictions that imagine Lily's life if she had survived. In these stories, she would be a key figure in Harry's life, guiding him and protecting him in ways that Dumbledore or others couldn't. She might also play a role in the wizarding world's politics, using her intelligence and magical abilities to bring about positive change.
In a 'Harry Marries Ginny' fanfiction, a great plot could be about them starting a family. It could detail Ginny's pregnancy, Harry's concerns and excitement, and how they prepare for the arrival of their baby. It could also include the reactions of their friends and family. This would be a heart - warming story that shows their growth as individuals and as a couple.
In this 'Harry Marries Pansy' fanfiction, it could start with a magical accident. A spell gone wrong makes them share a special connection. They can feel each other's emotions. Through this, they learn about each other on a deeper level. Harry discovers Pansy's loyalty and Pansy sees Harry's kindness. This unique situation leads to them getting married as they can't imagine a life without each other now.