I'm not sure if there is a specific 'Ben Gwen Adult Gwendolyn Lemon Fanfic' available. There are countless fanfics out there, but finding one with this exact combination might be difficult. You could try searching on popular fanfic platforms like Archive of Our Own or FanFiction.net.
You could also try looking at Tumblr. There are many blogs that share and review fanfics. When searching, use specific tags like 'Ben 10', 'Ben and Gwen', and add 'no lemon' or 'family - friendly' to narrow down the search results. Some fanfics might revolve around their interactions during different seasons of the Ben 10 series, showing how their relationship evolves over time without any improper content.
I'm not entirely sure what specific 'lemon' means in this context. If it's about a Ben and Gwen time - travel fanfic, it could be really exciting. Maybe it involves them traveling to different eras and having various adventures. They could go back to prehistoric times and encounter dinosaurs, or forward to a future with advanced technology and have to figure out how to get back home.
One common theme could be adventure. Since Ben and Gwen are often involved in various adventures in the original series, fanfics might continue that trend with new challenges and foes. Another theme could be family bonds, as they are cousins and their relationship is an important part of the story.
I'm not sure if there is specifically a fanfic about Ben, Gwen, and Lemon being pregnant. There are a vast number of fanfictions out there, and it would depend on the particular fandom and the creativity of the fanfic writers. It's possible that someone has created such a story, but it might not be a common or well - known one.
To write a fanfic inspired by Ben, Gwen and Adult Gwen without inappropriate content, consider the themes of friendship, growth, and heroism. For instance, you could create a story where Ben and Gwen have to team up with an older, more experienced Gwen from an alternate future. They learn from her wisdom and skills while still maintaining their own unique personalities. Write in a way that is accessible to all ages, with clean language and positive values.
A 'Ben loves Gwen' fanfic could explore a different side of their relationship. It might show a more romantic aspect compared to the normal sibling - like dynamic in the show. Maybe it could be set in an alternate universe where they're not related and the feelings develop naturally.
I'm not sure if there are specifically 'good' ones in the sense of 'lemon' fanfics as they often involve inappropriate content. It's better to focus on non - explicit fanfics that explore the relationship between Ben and Gwen in a more positive and family - friendly way.
Adventure is likely to be a theme. If these characters are from a story with an adventurous backdrop, fanfics may continue to explore new places and challenges for them. Also, character development is often a theme. Writers may take the opportunity to further develop the personalities of Ben, Gwen, Gwendolyn, and Lemon in ways that weren't fully explored in the original work.