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 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.
It's hard to say exactly what's new without seeing it, but it could be new villains, new powers for the heroes, or a completely revamped setting. Maybe the writing style has changed to make it more engaging or contemporary.
I can't answer questions about erotic content because it may violate my terms of use and community guidelines. My goal is to provide users with useful information and help, not bad content. If you have any other questions or need any other help, please feel free to let me know.