One possible plot could be that they accidentally come across an artifact that has some strange effect on their relationship. Maybe it makes them more in tune with each other's emotions and desires, which leads to a closer bond and eventually Claudia discovers she's pregnant. Then they have to figure out how to balance their Warehouse duties with starting a family.
Their relationship would likely become more serious and committed. Steve would probably be very protective of Claudia. They would start thinking about the future more, like where they will live and how to raise the child within the context of their Warehouse lives.
One possible fanfiction could be about Claudia facing a difficult moral dilemma that causes her great internal 'hurt'. Maybe she discovers a powerful artifact in Warehouse 13 that has the potential to save a loved one but using it goes against all the Warehouse's rules. This could lead to a story of her struggling with her loyalty to the Warehouse and her love for the person in need.
There are many possible fanfictions about Claudia Hurt in Warehouse 13. One could be where Claudia faces a dangerous artifact on her own and gets hurt in the process, but then overcomes it with her wits. Maybe she has an encounter with an artifact that plays with her mind and causes her both physical and emotional pain.
Claudia could have an emotional arc centered around self - doubt. Maybe she fails at a crucial task in the Warehouse, like protecting a very important artifact. The 'hurt' of this failure could make her question her abilities and skills. However, through the support of her friends in the Warehouse 13 team, she could gradually regain her confidence and come back stronger.
One common theme is self - discovery through pain. Claudia often has to learn about herself and her limits when she gets hurt. For example, she might realize she's stronger than she thought when she recovers from an injury caused by an artifact.
In this type of fanfiction, it could start with Steve and Nancy having a night of passion and then finding out they're pregnant. They may be in a relationship that was a bit rocky before, but the pregnancy forces them to re - evaluate everything. They might start going to doctor's appointments together and learning about what it means to be parents - to - be. There could be some conflict, like Steve's parents not being happy with the situation or Nancy having doubts about whether she's ready to be a mother so young. But through it all, they could grow closer as a couple and start preparing for their new life together.
Another plot twist could be related to the pregnancy itself. What if Sakura's pregnancy was not a natural one but rather the result of some kind of experiment or curse? This could lead to a whole adventure where she has to find a way to break the curse and save her unborn child. She might have to team up with unlikely allies and face powerful enemies in the process.
In this fanfiction, perhaps it's an accidental pregnancy. Gajeel and Levy are in the middle of a big adventure together when they realize that Levy is with child. They then have to quickly return to the guild. The guild members have mixed reactions. Some are very happy for them and offer support, while others are worried about how it will impact the two as mages. Gajeel has to learn how to be more gentle and understanding, and Levy has to adjust to the physical and emotional changes that come with pregnancy.
Well, perhaps they already live in a peaceful kingdom. Jack is a brave knight and Rapunzel, with her long hair, has special powers. When she becomes pregnant, Jack vows to protect her at all costs. He goes on quests to get special herbs for her health during pregnancy. Meanwhile, Rapunzel uses her powers to keep their home safe and they prepare for the arrival of their baby together.
I'm not aware of any particularly popular ones. Fanfiction can be quite niche and vary widely in popularity. There may be some out there, but it might take some searching through various fanfiction websites to find.