Well, perhaps the kidnapper is a copycat of a previous unsub that JJ helped put away. He wants to make her suffer as he believes she ruined the original unsub's 'legacy'. So he takes her to a remote location, and while she's trapped, she tries to use her profiling skills to understand his motives and find a way to escape or signal for help.
One idea could be that they support each other through the pregnancy journey. Since they are colleagues, they might face challenges at work while being pregnant. For example, JJ could worry about how her field work will be affected, and Morgan could offer his own experiences and support. Another plot could involve their partners' reactions. Maybe JJ's husband is over the moon but also a bit overprotective, and Morgan's partner is equally excited but also has concerns about the danger of his job in the BAU.
Another idea is that their pregnancies could be a result of different circumstances. JJ might be happily married and planned her pregnancy, while Emily could have an unexpected pregnancy. This could lead to different emotional arcs for them. They might also bond over the shared experience of motherhood approaching, despite their initial differences in how they got pregnant.
Well, here's a plot. A new agent joins the BAU who seems to have a romantic interest in Reid. JJ gets jealous and starts to analyze her own feelings for Reid. Meanwhile, they are working on a case that involves a cult that has some sort of mind - control element. As they work to free the victims, JJ and Reid have to face their feelings head - on. This plot would involve a lot of drama, both in terms of the case and their relationship.
One possible plotline could be that the unsub kidnaps JJ because she has been getting too close to uncovering his identity in a series of murders. The team then has to race against time to find her. They might start by retracing her last steps and interviewing people she was in contact with recently.
It could be a former criminal that JJ put in prison and who has now been released and seeking revenge. Maybe it's someone from her past that she had a run - in with during her early days in the BAU.
Well, you could write a fanfiction where the BAU team gets trapped in a virtual reality world created by a tech - savvy unsub. They have to solve puzzles and cases within this virtual world in order to escape. Or perhaps a story where a new agent joins the team who has a psychic ability that they keep hidden at first. But as the cases progress, this ability starts to surface and help the team in unexpected ways.
One interesting JJ pregnant fanfiction could be about how the team at BAU supports her during her pregnancy. They might go out of their way to protect her from dangerous cases and ensure she has a stress - free environment. For example, Reid could use his knowledge to give her advice on prenatal care.
One idea could be that the BAU team has to deal with a serial killer who is using ancient psychological torture methods. They have to quickly understand the killer's motives which are deeply rooted in some long - forgotten cultural practices.
One idea could be a vampire using their powers to manipulate crime scenes in ways that baffle the Criminal Minds team. For example, they could use their super speed to move evidence or their mind - control abilities on witnesses. Another plot could involve a vampire who is a serial killer, preying on victims in a pattern that the team has to figure out. Maybe the vampire has a moral code that only certain types of people are their targets, and the team has to understand this code to catch them.
In some fanfictions, Reid's kidnapping could be related to his family secrets. Maybe there's someone from his past, like a long - lost relative or someone his mother knew, who abducts him to get to something valuable, either information or an object. This could lead to a lot of self - discovery for Reid as he tries to figure out the motives behind his abduction while also trying to escape.