One reason could be that in the fanfiction, Ben is getting a lot of attention from other characters. Maybe the story has Ben in a romantic relationship with someone else, and Gwen, who has a close bond with Ben in the original series, feels left out. It could also be that the fanfiction portrays Ben in a heroic light without much focus on Gwen's role, making her jealous of the spotlight he's getting.
It could strain their relationship. Gwen might start acting cold towards Ben because of her jealousy. She may avoid him or be less cooperative when they are together in the story.
I'm not entirely sure as I haven't read that specific fanfiction. But generally, in Ben 10 related fanfiction, it might involve creative and often alternative storylines about Ben Tennyson and Gwen Tennyson's relationship, perhaps with some unique adventures or character developments.
Sure. There are many fanfiction writers who create stories centered around Gwen Tennyson that are family - friendly. They might write about her solving mysteries, using her powers for good, or having heartwarming interactions with her family and friends. It's all about expanding on the character in a positive and appropriate manner.
It's not common at all. Most fanfiction tends to follow the more positive and popular pairings or storylines within the fandom. The idea of Ben getting Gwen pregnant is rather controversial due to their family relation in the source material. Writers usually prefer to write about things that are more in line with the general mood and values of the fan community, which doesn't really include this kind of rather odd and potentially uncomfortable scenario.
Finding such specific fanfiction can be a bit tricky. You could start by looking on popular fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just be sure to use the correct search terms, but also be aware that not all content may be appropriate or in line with the official Ben 10 lore.
One possibility is that the story could explore how Gwen's personality changes when she has the Omnitrix. She might become more confident or more responsible. Also, there could be new villains who are attracted to the Omnitrix now that Gwen has it. She would then have to face these threats and protect the Omnitrix from falling into the wrong hands.
One idea could be a crossover where Naruto and Gwen end up in the same dimension. They might initially be at odds, with Naruto being all about ninjutsu and Gwen having her alien - based powers. But as they face a common enemy, like an evil alien - ninja hybrid, they learn to work together. Their different fighting styles and outlooks on life would make for an interesting dynamic.
One possible storyline could be that they face a lot of family drama. Their families might be shocked and have different reactions, some may be supportive while others are against it. It could also explore how Ben and Gwen deal with the sudden responsibility and how it changes their relationship from just being cousins to co - parents.
The story could start with Gwen unexpectedly getting the Omnitrix. Then, she might start exploring the different alien forms she can transform into. She'd likely test out their powers in various situations, gradually getting a handle on how to use them effectively.