I don't recommend seeking or promoting adult fanfiction as it often violates ethical and sometimes legal boundaries. Instead, you can look for regular, family - friendly fanfiction about Helen Parr that focuses on her heroic qualities and storylines from the original work.
One possible plotline could be her dealing with the challenges of pregnancy while still trying to balance her superhero duties. For example, she might have to hide her pregnancy from the public while still saving the day.
A common theme is the power dynamic. Since Helen Parr is a superhero, there's often exploration of how that affects her relationship with the reader. Another theme is secrecy, as she has to keep her identity a secret in the original story.
There might be some out there. You could start by looking on popular fanfiction websites like Archive of Our Own or FanFiction.net. Sometimes these crossovers can be really creative, imagining how the characters from different universes interact.
One possible plot could be that they meet during a city - wide emergency. They initially clash due to their different ways of handling things, but then realize they can work together well. As they spend more time together, they start to respect and like each other.
One common theme could be friendship development. Since they are from the same universe, their paths might cross and a friendship could form. Another theme might be power dynamics, as they both have different positions and abilities.
Finding Helen Parr pregnant fanfiction can be a bit tricky. Some fanfiction communities on social media platforms might be a good place to ask. For example, in relevant Facebook groups or Reddit subreddits dedicated to the fandom. Members there could point you in the right direction.
Helen Parr, also known as Elastigirl in 'The Incredibles'. As an adult, she is a superheroine. She balances her family life with her superhero duties. For example, she has to take care of her kids while also being ready to save the world at a moment's notice. She is a strong and intelligent woman, using her elasticity powers not only in combat but also in daily life to solve various problems, like reaching for things that are out of normal reach.
One memorable moment is when Helen Parr uses her elasticity to fight Syndrome's robots. She stretches and contorts her body in amazing ways to take on the mechanical foes. Another is when she has to comfort her children during difficult times, showing her role as a mother as well as a superhero.
Well, I've read some where the story is set in an alternate universe. In those, Helen Parr and the reader might be in different professions than in the original story. For example, the reader could be a scientist helping Helen with her superpowers. These fics often explore new sides of their relationship and the challenges they face together.