One possible theme could be the challenges and joys of expecting a child within the context of the story's setting. For example, how the characters adapt to the new situation.
I'm sorry, I'm not aware of specific 'The Longest Ride' pregnant fanfiction. You can try searching on fanfiction websites like Archive of Our Own or FanFiction.net.
Love and sacrifice are main themes. The young couple has to make sacrifices for their relationship, and the older man's story is also full of selfless love.
One interesting story could be about the characters exploring new places together. They might discover a hidden part of the town that was never mentioned in the original work. This could add a new layer of adventure to their relationship.
Well, in this kind of fanfiction, a plotline could revolve around the search for a safe place to have the baby. Since they are often on the run in 'Maximum Ride', finding a secure location would be crucial. Also, the relationship between the pregnant character and her partner (if there is one) could be explored. Maybe there are misunderstandings or moments of great closeness during this time.
Another theme could be the loss of innocence. At 15, a girl is still a child in many ways, and pregnancy can suddenly thrust her into a very adult situation. This could be explored in terms of how she copes with the loss of her carefree youth.
It's about a love story that spans different generations. It weaves together the tales of two couples, with themes of love, sacrifice, and the power of art.
One possible theme could be freedom. The title 'ride the wind' gives an impression of unrestrained movement, which often symbolizes freedom. Another theme might be adventure, as riding the wind can imply going on an exciting journey.
One possible theme could be about the challenges and joys of impending motherhood. Another could be how the character's relationships change with her partner and those around her during the pregnancy.
One possible theme could be about new life and the responsibilities that come with it. Even though Mewtwo is a powerful Pokémon, dealing with pregnancy might bring out a different, more nurturing side of it.
One possible theme could be the challenges they face as a couple during the pregnancy. Another could be the anticipation and excitement of starting a family.