It's not okay. Such content can make others uncomfortable and also goes against the general respect we should have for fictional characters. There are many other ways to explore the relationship between Emily and Aron in fanfiction, like their adventures or friendship development without involving sexual content.
Writing fanfiction that involves sexual content is not appropriate in most cases. It violates ethical and moral boundaries, especially if it involves non - consensual or inappropriate portrayals. Moreover, it may also be against the terms of use of many platforms.
A great alternative theme would be their adventures in a different realm or time period. Maybe they travel back in time or end up in a magical land. This would allow for a lot of creativity in terms of world - building, character exploration, and plot development, rather than focusing on inappropriate sexual content.
There could be many interesting plotlines in such a fanfiction. Maybe it could start with how they found out about the pregnancy. For example, in a moment of surprise and joy, Emily discovers she's pregnant and then she tells Aaron. Their relationship could grow even deeper as they prepare for the new arrival. They might face challenges like how to balance their work in the Criminal Minds (CM) unit with their impending parenthood. They could also start planning for the future, like finding a bigger place to live or thinking about baby names.
One possible theme is the transformation of their relationship. With a baby on the way, they will have to become more than just partners at work and in a relationship. They will be parents, and this will bring a new level of commitment and love. Another theme could be the fear and excitement of the unknown. Having a baby is a big step, and they will experience a mix of emotions.
No, it's not appropriate. Writing fanfiction involving sexual content about real people is unethical and disrespectful to the individuals. They are real people with their own lives and privacy, and such content violates their rights.
You could look for general friendship - based fanfiction about JJ and Emily. There are many well - written stories that focus on their adventures together, their loyalty to each other as friends or colleagues in the story's universe.