One great James and Lily kiss fanfiction could be where it's set during their time at Hogwarts. Maybe it's after a Quidditch match and James has just won, and in the excitement, he sweeps Lily into a passionate kiss. Another could be a more angsty version where they have an argument first, but then the kiss is a moment of reconciliation.
The kiss can be a turning point. It might make their relationship more serious. Before the kiss, they might have just been friends or had unspoken feelings. But after the kiss, they start to think about a future together. For example, they might start spending more time alone, going on secret dates around Hogwarts, like picnics by the lake.
You can start by looking on popular fanfiction websites like Fanfiction.net or Archive of Our Own (AO3). Just type in 'James and Lily kiss' in the search bar, and you'll get a list of relevant stories. AO3 usually has a more diverse range of stories with different ratings and tags to help you filter what you're looking for.
One interesting scenario could be that the kiss happens right after James has finally proven himself to Lily. Maybe he has just saved her from some sort of danger, like a dark wizard attack at Hogwarts. Lily, seeing James in a new light, is so overcome with gratitude and a newfound attraction that she impulsively kisses him. This would be a moment of realization for both of them, as James has been longing for Lily's affection for so long.
James might impress Lily's parents by showing his intelligence. For example, if they discuss a current event or a historical topic, James could offer well - thought - out opinions and insights. He could also show his caring side towards Lily, like how he always makes sure she's okay when they are out together. This would make her parents think he's a great partner for their daughter.
Harry would often be a main character in these fanfictions. Since it's about bashing his parents, his reaction and how he copes with the new view of them is a big part of the story. Another could be Sirius Black. He was very close to James, so fanfictions might explore his feelings towards the bashing of his best friend.
Love is a very common theme. Their love story is often explored in great detail, from the initial dislike to the deep, passionate love they end up sharing. Another common theme is friendship, especially James's friendship with the Marauders and how Lily fits into that dynamic.
Well, I really like 'James Potter and Lily Evans: The Untold Story'. It shows their relationship in a new light, with a lot of character development for both of them. Then there's 'The Lily - James Bond' which is quite interesting as it has a lot of action and adventure while still exploring their relationship. And don't forget 'James and Lily's Secret Moments' which has some really sweet and tender moments between the two.
Petunia could be an important character. She might be grudgingly attending the wedding, still having mixed feelings about Lily's magical world. Her presence could add some tension as she struggles to fit in. And then there's Dumbledore. He could make an appearance and give some wise words of advice to the couple, perhaps about the future challenges they might face together.