One common theme is time - travel. It allows for Lily and Harry to interact in a way that defies the normal timeline of the original story. For example, Harry might go back in time and that's how their relationship starts. Another theme is alternate universes, where the rules of the wizarding world are different, and this enables their love to develop in a new context.
There are several platforms where you can find such fanfiction. Archive of Our Own (AO3) is a great place to start. Just search for 'lily falls in love with harry' in their search bar and you'll get a list of relevant stories. Some might be AU (Alternate Universe) stories which can be really interesting as they often take the characters out of their original story settings and put them in new and unexpected situations.
One common theme is redemption. Severus has made some mistakes in his life, and in these fanfictions, Lily's love can be seen as a way to redeem him. Another theme is the power of unrequited love turned into something more. For a long time, Severus loves Lily from afar, and when she falls for him, it's like a transformation of that love.
Well, I've read a fanfiction named 'Lily and Severus: The Forgotten Love'. It presents a unique take on their relationship. It begins with Lily finding an old diary of Severus which contains his deepest thoughts and feelings for her. As she reads through it, she starts to question her own feelings towards him. This story is full of emotional turmoil and self - discovery for both characters. There are also other great ones out there, but these are some of the ones that stand out in the 'lily falls in love with severus' genre of fanfiction.
One possible analysis is that in many such fanfictions, the development of their relationship often draws on the existing chemistry from the original 'Harry Potter' series. Writers might explore how Harry's feelings gradually shift towards Ginny, perhaps starting from his realization of her as more than just Ron's sister. For example, they could focus on moments where Ginny shows her bravery and independence, which are traits Harry admires.
One possible scenario in this fanfiction could be that Voldemort's love for Harry completely changes his character. His love might make him question his dark path and the evil deeds he has done. It could lead to a complex internal struggle within him as he tries to reconcile his newfound feelings with his long - held beliefs of power and domination.
One interesting Draco falls in love with Harry fanfiction is 'Harmony of Opposites'. In this story, the author does a great job of gradually developing their relationship. It starts with Draco being forced to work with Harry on a school project. At first, they're at odds, but as time goes on, Draco realizes his feelings are changing. The story is full of tension and sweet moments that really draw you in.
One great fanfiction on this theme is 'The Marauders' Era: Lily's Perspective'. It delves deep into how Lily might have gradually fallen for James. It shows their interactions in Hogwarts in a very detailed and engaging way.
A common theme is the exploration of their first dates. Writers might describe how nervous Harry is, given his lack of experience in the dating world, and how Ginny is more confident and helps him relax. For example, they could go on a picnic by the Hogwarts lake, and the story would focus on their conversations and growing closeness during that time.
One of my favorite tropes is the 'secret relationship' trope. In these fanfictions, Draco and Harry have to hide their feelings from everyone else in the wizarding world. It adds a layer of secrecy and danger, which makes the story more exciting. They might have to sneak around Hogwarts, using magic to avoid being caught, and it creates a lot of tense and thrilling moments.