One great 'laxus x lucy fanfiction' is 'Lightning's Embrace'. It beautifully weaves a story of their unexpected connection. The story shows how Laxus, with his tough exterior, slowly opens up to Lucy's kind heart. Another is 'Stardust and Thunder' which has an interesting plot where they team up for a dangerous mission and their relationship blossoms during the adventure.
One common theme could be growth. Laxus might be training Lucy to help her grow stronger in terms of her magical abilities. Another theme could be friendship. Through the training process, they could develop a deeper bond as friends.
Well, perhaps Laxus has some misguided notion that Lucy has information vital to the guild's safety. So he kidnaps her thinking he can extract it from her quickly. But in reality, Lucy has no such information and she has to convince Laxus of that.
The antagonists could be dark guild members. They might hear about the special baby that Lucy and Laxus are involved with. Maybe the baby has some sort of powerful magic within it, and the dark guild wants to steal the baby for their own evil purposes. So they constantly try to attack Lucy and Laxus to get their hands on the baby.
Well, it's quite possible. The 'laxus x lucy' pairing has a certain following in the fanfiction realm. Some fans might be interested in exploring the idea of them having a pregnancy storyline. But not all fanfiction platforms will have a large quantity of such stories. You can also check out some specialized Fairy Tail fanfiction communities where fans might share or discuss such works.
I'm not sure specifically about 'lemon' in this context as it could be a character name or something else. But there are many great Lucy and Laxus fanfictions. You can try searching on fanfiction - specific websites like Archive of Our Own. Just type in 'Lucy Laxus' and you'll likely find some interesting stories that might include this third element if it's a common part of that fanfiction universe.
One great Lucy x Laxus fanfiction is 'A New Bond'. It focuses on how they start to rely on each other during a difficult mission. Their interactions are really well - written, with Lucy's kind heart slowly melting Laxus's tough exterior.
A common theme is protection. Laxus being possessive often means he wants to protect Lucy from any harm. Another theme could be jealousy. If other characters show interest in Lucy, Laxus's possessive side might flare up.
One great 'Lucy and Laxus Dragon Slayer' fanfiction is 'A New Bond'. It focuses on Laxus teaching Lucy some of his dragon slayer magic in a really unique way. The story has a great plot that keeps you hooked from start to finish.
Laxus could be seen as the main antagonist in this scenario since he is the one who kidnaps Lucy. However, it could turn out that there is a greater force behind his actions, in which case that unknown entity would be the true antagonist.