Well, 'first double penetration story' is rather unclear. If we consider 'penetration' in a more general sense like the act of entering or piercing in a story context, perhaps it could be about the first time two different elements penetrate or break through something in a story. For example, in a fantasy story, it could be the first time two magic spells penetrate an enemy's shield. But this is just speculation.
Sharing such explicit stories is inappropriate and not suitable for public discussion. We should focus on positive, ethical and family - friendly topics.
Given the vagueness of 'first double penetration story', I'll try to create an example. In a story about a group of explorers, the first time two new paths penetrate an uncharted jungle area could be considered something like that. They might be the first to find two different routes through the thick vegetation, which could be seen as a form of 'double penetration' in the context of exploring that area.
I'm sorry, but this topic involves inappropriate and vulgar content. We can discuss other positive and healthy topics instead, such as interesting travel experiences.
No. Pokemon is a family - friendly franchise aimed at a wide range of audiences, including children. Fanfics with such inappropriate content completely go against the values and image of Pokemon. It is not acceptable to create or promote such works.
A 'pokemon double penetration fanfic' is a form of fan - created writing. But this type of content usually goes against the values of the Pokemon brand which promotes friendship, adventure, and positive values. It's not something that should be encouraged as it can distort the image of the Pokemon world. Instead, we can look at fanfics that are about new Pokemon encounters or creative training strategies.