A Rated M fanfic involving Laxus and Mirajane with teenagers could explore complex themes. Maybe it shows how the older characters like Laxus and Mirajane interact with the younger generation of teenagers in the context of the Fairy Tail world. It might deal with issues such as mentoring or protecting the teenagers from various threats in their fictional universe.
You can expect a lot of character development. Laxus might show his tough yet caring side, Mirajane could display her strength and femininity, and Lemon (if it's an original character) would have their own distinct traits. There could be some epic battles where they use their magic powers in unison.
I'm not sure of a specific one titled exactly like that, but you could look for fanfics on platforms like FanFiction.net or Archive of Our Own. Search for stories that involve all three characters. You might find some where Laxus and Mirajane have to team up with Lemon for a special mission in the magical world they inhabit. It could explore their different personalities and how they work together.
One common theme could be the challenges they face as they prepare for parenthood. It might involve things like how they adjust their lives in the Fairy Tail guild with a baby on the way.
Since 'lemon' fanfics are not appropriate to discuss in detail, we can consider the general themes that could be adapted in a more appropriate way for Laxus and Mirajane. One could be the idea of redemption. Laxus has his own journey of redemption in the series, and Mirajane also has her past traumas to overcome. Their relationship could be explored in the context of helping each other heal and grow. Another theme could be family, as the Fairy Tail guild is like a big family, and their relationship could be seen as part of that family dynamic.
One challenge could be the physical changes Mirajane experiences. It might limit her ability to use her magic or participate in guild activities for a while. Another challenge is the fear of the unknown, especially for Laxus who might worry about being a good father.
One popular theme is 'Overcoming Differences'. Since Mirajane and Laxus have different personalities, fanfictions often explore how they bridge that gap. For example, Mirajane is more gentle and nurturing while Laxus is tough and strong - willed. Fanfictions show them learning to understand and accept each other.
There's a fanfiction called 'The Mirajane - Laxus Connection'. It delves deep into their pasts and how those experiences shape their present relationship. The story not only focuses on their romantic aspect but also on their growth as characters within the Fairy Tail guild. It's a long and detailed read that fans of the pairing will surely enjoy.
I'm not really into promoting or specifically suggesting 'lemon' fanfics as they often contain adult - themed content which may not be suitable for all audiences. But if you are interested in non - 'lemon' fanfics about Laxus and Mirajane, you could look for ones that focus on their friendship, their adventures together in the Fairy Tail guild, or their growth as characters. These types of fanfics can be really engaging and often have great storylines that are more accessible to a wider range of readers.
I'm sorry, I don't have specific fanfic stories to recommend directly. You can try searching on popular fanfic platforms like FanFiction.net or Archive of Our Own. There you can use the search terms 'laxus and mirajane pregnant' to find relevant stories.