One possible storyline could be that Gibbs discovers Abby is pregnant and becomes extremely protective. He might start hovering around her at work, making sure she's not overexerting herself. This could lead to some comical moments as Abby is a very independent character and might not take too kindly to Gibbs' over - protectiveness at first.
Their relationship would likely become more intimate and protective. If Abby is pregnant, McGee would be constantly looking out for her, making sure she's not overworking or getting into dangerous situations at work.
Their relationship would likely become more intimate on an emotional level. Gibbs would probably be more open and tender towards Abby, seeing her in a new light as a mother - to - be.
One possible plot twist could be that Abby tries to hide her pregnancy from her colleagues at NCIS for fear of how it might affect her work. Maybe she's worried about being sidelined from important cases. Another could be that the father of the baby is someone unexpected within the NCIS world, like a character who has had an on - again, off - again relationship with Abby. And perhaps there's a mystery surrounding the pregnancy itself, like some sort of threat to the unborn baby that Abby has to deal with while keeping it all a secret.
One interesting angle could be Abby's relationship with her friends at NCIS during the secret pregnancy. How she interacts with them while hiding such a big secret can add a lot of drama. For example, she might have to lie to Gibbs about why she can't stay late at work. Another angle is the medical aspect. Since Abby is in a scientific field, she might be more aware of the risks and intricacies of pregnancy, which could add an extra layer of worry. And finally, there's the angle of how the pregnancy will change Abby's future at NCIS. Will she take a break? Will she still be as involved in cases?
There are fanfics where Abby's pregnancy is a big surprise to everyone, including herself. In these stories, her relationship with the baby's father (whichever character the author chooses) can be explored in depth. It could be a story full of drama, with Abby trying to figure out how to balance her new life as a soon - to - be - mother and her important role in the NCIS team.
She might become more empathetic. Pregnancy can bring out different emotions, and Abby could start to understand others' situations better. For example, she might be more patient with victims in cases.
Abby's messy ponytail in NCIS fanfiction often represents her non - conformist nature. She's not one to worry about looking perfect all the time. The ponytail might be mentioned when she's interacting with other characters too. For example, Gibbs might give her a knowing look when her ponytail is especially askew after a particularly exciting discovery in the lab, and it becomes a little moment of connection between them based on their long - standing relationship and her unique style.
You can start by looking on fanfiction.net. It has a large collection of NCIS fanfictions, including many about Abby and Tony. The site is easy to navigate, and you can search specifically for their stories using the search bar.
One great Abby and Tony fanfiction is 'The Unlikely Bond'. It delves into their unique relationship outside of the regular casework. It shows how they support each other during tough times and their shared sense of humor.