One possible theme could be friendship. If it's their first time doing something together like going on an adventure, it might highlight the bond of friendship between them.
Another theme could be discovery. They could be discovering a new place or a new side of themselves during this 'first time' experience, which could be really exciting and a great way to develop their characters further in the fanfiction.
Well, if we're talking about a 'pepa and silvia first time fanfiction', it might be important to consider the context within which this 'first time' is set. Is it their first time meeting, first time working together, or something more romantic? Without reading it, it's hard to say for sure. But often, a good fanfiction in this case would build up tension and anticipation before getting to the 'first time' moment, whatever that may be.
One interesting Pepa and Silvia fanfiction could be about their adventures in a magical forest. Maybe they discover a hidden realm and have to solve puzzles to get out.
You can try fanfiction websites like Archive of Our Own (AO3). It has a large collection of fanfictions from various fandoms, and there's a good chance you'll find some great Pepa and Silvia fanfictions there.
One common theme is love and support. Since Felix is always there for Pepa, many fanfictions explore how their love helps Pepa manage her emotions better.
The theme of vulnerability is likely. When it's their first time, they are both in a very exposed state. This fanfiction could explore how they handle that vulnerability, whether they embrace it or shy away from it. Also, the theme of trust. They have to trust each other completely in this moment, and the story could show how that trust is built or tested.
Love and attraction could be a major theme. The 'first time' might be the moment when their romantic feelings start to surface. It could show how they initially deal with these new - found emotions, whether they embrace them or try to resist at first.
Well, a recurring theme is self - discovery. Ash and Silvia both grow as characters, learning about their own strengths and weaknesses. Also, the theme of loyalty shows up a lot. They are loyal to each other and to their friends. Additionally, the theme of sacrifice can be found in some fanfictions, where one might sacrifice for the other's well - being.
Another theme might be adaptation. Facing a new situation like in this 'pegging first time story', the person has to adapt to new circumstances, new people perhaps, or new ways of doing things. For example, they might need to adapt to a new environment related to the 'pegging' activity. This could involve getting used to different equipment or procedures. It's all about how they handle this newness and change.
One possible theme is self - discovery. For example, his first time trying a new sport like surfing. He discovers his physical limits and his ability to overcome fear in the face of big waves. This helps him understand himself better.
One possible theme could be the deepening of their emotional bond. It could show how this physical step is a result of their growing love and trust for each other. For example, it might explore how they have overcome various obstacles in their relationship and this moment is a celebration of their connection.