A plot could be centered around the baby's first year. Veronica and Logan document every milestone in a scrapbook. But then the scrapbook goes missing, and they suspect someone in their small town might be trying to cause trouble. So they embark on a journey to find the scrapbook and in the process, they strengthen their bond as a family.
One idea could be that Veronica and Logan are new parents and they struggle with the lack of sleep. They have to learn how to take care of the baby while also dealing with their own relationship issues. For example, Logan might be worried about providing enough for the family financially, and Veronica has to balance her career aspirations with motherhood.
Well, perhaps in the fanfiction, Logan could be really over - protective of Veronica during the pregnancy. He might hire a whole team of security for her. And Veronica, being the independent person she is, might struggle with this at first. Also, they could have a storyline where they start preparing the nursery and they have different tastes in decoration. Logan wants something super luxurious while Veronica wants a more practical and simple design.
Perhaps in the fanfiction, there's a school event like a masquerade ball. Veronica is initially hesitant to go with Logan, but he convinces her. At the ball, they get lost in the crowd and find a quiet corner. They start talking about their past misunderstandings and as they do, they hold hands for the first time, leading to a more intimate moment that is the start of their relationship.
One plot idea could be that Rogue and Logan discover their baby has a unique mutant ability that they need to protect from a group that wants to use it for evil. Another could be the baby getting lost in a dangerous mutant - friendly area and Rogue and Logan have to search for it while facing various challenges along the way. And a third idea might be that the baby is sick and they have to find a cure, which leads them to explore different parts of the mutant world they've never been to before.
There's also 'The Logan - Veronica Baby Adventure'. In this fanfiction, it details how Logan and Veronica adjust their lives around the new addition. It shows Logan's protective side over Veronica and the baby, and Veronica's strength in handling the new family situation. It's a heartwarming read.
The plot could involve Logan and Veronica trying to find a balance between their personal lives and their careers while dealing with the pregnancy. They could also have some relationship issues that are magnified by the upcoming addition to their family. For example, Logan's overprotectiveness might start to grate on Veronica's independent nature.
A great plot could be that a new threat emerges that targets both magic - users and mutants. Harry and Logan are brought together by a mutual acquaintance who believes that their combined abilities are the key to stopping this threat. Along the way, they learn from each other's worlds, with Harry teaching Logan about magic spells for protection and Logan showing Harry some of his survival and combat techniques.
You can try fanfiction.net. It has a large collection of fanfictions, and there are likely some about Logan and Veronica having a baby there.
Their complex relationship in the original work makes it interesting. In fanfiction, writers can explore different scenarios that were not fully developed in the show. For example, how they deal with challenges after getting together.
One idea could be that Logan is initially shocked but then becomes extremely protective. He starts preparing a safe haven for Rogue and their unborn child, like fixing up an old cabin in the woods. He gathers supplies and makes sure no one can harm them.
Maybe in the fanfiction, there's a school competition where Zoey and Logan are on opposing teams at first. But then they realize that there's some cheating going on within the competition and they team up to expose the truth. Along the way, they discover that they have more in common than they thought, like their love for justice and fairness.