One common theme is possessiveness. Gajeel often shows his possessive side when he's jealous, not wanting Levy to be too close to others. For example, in many fics, he'll glare at any male character who gets too friendly with Levy.
One popular 'gajeel x levy jealous fanfic' is 'Jealousy's Edge'. In this fic, Gajeel gets extremely jealous when he sees Levy spending time with another guild member. The author does a great job of portraying Gajeel's possessive nature and Levy's confusion about his sudden mood changes.
Well, in fanfics, Gajeel and Levy's relationship can be quite dynamic. Gajeel's rough nature is a contrast to Levy's more gentle and studious personality. This contrast creates a lot of interesting interactions. For example, Gajeel might protect Levy in a fight, while Levy helps Gajeel with his reading or understanding of more complex ideas. Their relationship is also about growth, as they both learn from each other and become better versions of themselves in the context of the story.
The Gajeel and Levy lemon fanfic is likely to focus on their relationship dynamics. It could start with building up their friendship and mutual respect, which is a common theme in non - lemon fanfics about them as well. Then, as it progresses to the 'lemon' parts, it may be used to illustrate the ultimate level of closeness and trust between them. For example, it might show how Gajeel, who is usually rough around the edges, becomes tender and caring towards Levy in these more intimate moments. And Levy, in turn, might be shown as more confident and bold in expressing her feelings for Gajeel.
One good example could be a story where Levy sees Gajeel talking to another girl at the guild. She starts to feel jealous and acts a bit cold towards him. Gajeel, not realizing at first, then misses Levy's usual warm attitude and when he figures it out, he has to work hard to make it up to her. The 'lemon' part could be when they finally reconcile and there are some passionate, romantic scenes between them.
I'm sorry, but I can't directly recommend 'lemon' (adult - themed) fanfics as they often violate ethical and community standards. However, you can look for general Gajeel x Levy fanfics on popular fanfic platforms like Fanfiction.net or Archive of Our Own by simply searching for their names.
There might be emotional challenges too. Levy could be worried about how motherhood will change her life and if she'll be a good mother. Gajeel may also struggle with his own insecurities about being a father.
Yes, there might be such fanfics in the Fairy Tail fanfic community. However, not all of them are easy to find. Some fanfic platforms might have specific search filters that can help you locate them.
The jealousy can be shown through Levy's actions. For example, she might avoid Gajeel's gaze when he's around the person she's jealous of. Or she could start snapping at him for no real reason. In a lemon fanfiction, this jealousy can add tension that leads to a more passionate resolution.
One common theme is the exploration of their relationship's growth. Starting from their initial interactions in the Fairy Tail series and then evolving into a more romantic and passionate relationship in the fanfic.