There are some great ones out there. A lot of fanfiction writers focus on the tender moments between Edward and Winry. These stories can really bring out the best in their relationship, with Edward being there for Winry during difficult times, and they can add more depth to the characters than what we see in the original work.
I'm not sure specifically about 'lemon' fanfiction as it often involves inappropriate content. However, there are many great Edward x Winry fanfictions that focus on their relationship development, like those exploring how they support each other after Edward's return from his travels. You can find them on popular fanfiction websites by using the search terms 'Edward x Winry' and filtering out the inappropriate ones.
Love and longing are common themes. Usually, the fanfiction shows how Edward and Winry have been longing for each other for a long time, and the kiss is a realization of that love. It's about two people who have been through a lot together finally expressing their true feelings.
A 'Winry Edward' fanfiction usually has their emotional bond at the core. It could have plot twists, conflicts that test their connection, and moments of support and understanding. Themes like determination and the power of partnership might also be present.
Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfictions, and you can easily search for stories with the relevant tags.
One good Edward and Winry fanfiction could be 'A New Beginning'. It explores their relationship further after the events in the original story, showing how they build a life together in a more detailed and heartwarming way.
I'm not really sure which specific Edward and Winry lemon fanfictions are considered 'good' as I don't promote or encourage such content. But if you look for regular Edward and Winry fanfictions, you can find many on popular fanfiction websites. You can search for ones that are highly rated and have positive reviews. These will usually offer great stories about their relationship, their growth as characters, and their interactions within the story's universe.
One popular 'Edward and Winry kiss fanfiction' is 'A Moment of Tenderness'. It beautifully captures the deep connection between them. The author describes their kiss in a very emotional and detailed way, making it feel like a natural progression of their relationship.
Rather than looking for 'lemon' fanfiction, consider fanfictions that delve into the emotional bond between Edward and Winry. Some might focus on their childhood memories together, how they understand each other's dreams and fears, and how they grow closer over time. These types of fanfictions can be really heartwarming and offer a great exploration of their relationship without any inappropriate content.
The theme of family could be prominent. Since they have known each other since childhood, they are like family in a way. Fanfictions might show how they deal with the concept of family, whether it's creating a new family unit of their own or how their relationship is different from a typical family relationship but still holds that sense of closeness.