There are fanfictions where male and female Eevee love is depicted in a more comical way. For instance, the female Eevee is always chasing the male Eevee around because she has a crush on him, but the male Eevee is a bit clueless at first. As the story progresses, he finally realizes her feelings. And then there are those that delve into their different evolutions and how that might affect their relationship, like if one evolves into a Vaporeon and the other into a Jolteon, and how they still manage to love each other despite their differences.
In fanfictions, they often portray their emotions through body language. For example, the male Eevee might wag its tail more when it's around the female Eevee it likes. The female Eevee could nuzzle up to the male to show affection.
One idea could be that the male and female Eevee are on an adventure together and they discover a magical place that makes their bond stronger. They could face challenges together and their relationship deepens as they rely on each other.
One popular theme is the journey they go on together. Maybe they're on a quest to find a special place or item, and their love grows during the adventure.
The possible offspring of a male and female Eevee could be any of its evolved forms depending on various factors in the Pokémon world. For example, if it's exposed to a water stone, it could evolve into Vaporeon. Eevee has a diverse genetic makeup that allows for multiple evolutionary paths.
The male Eevee might start off as a loner. But when he meets the female Eevee, he begins to change. He could develop a sense of loyalty towards her. The female Eevee, on the other hand, could be very social and introduce the male Eevee to new friends in the Pokémon community. This new social circle could put pressure on their relationship in some ways, but also help them grow. For example, they might have to deal with jealousy from other Pokémon who like either the male or female Eevee. Through these experiences, their characters can be further developed.
There are eevee crossover fanfictions with other Nintendo franchises too. For example, an 'Eevee and Zelda' crossover. Picture Eevee in the land of Hyrule, perhaps helping Link on his quests in some way. It could be really interesting to see how Eevee's abilities interact with the magic and mechanics of the Zelda universe.
The popularity might be due to the cuteness factor. Pikachu and Eevee are both very popular Pokémon, and seeing them in a love story is endearing. People like to imagine different scenarios for these beloved characters.
You can try fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'female Eevee' in their search bars, and you'll likely find a variety of fanfictions related to it.
One popular theme is evolution. Fans like to write about eevee's different evolution paths and the choices it makes. Another is friendship. Eevee is often shown making friends with other pokemon and going on adventures together. Adventure itself is also a big theme, like eevee exploring new lands or facing dangerous situations.
Friendship is also a big theme. The female Eevee might make friends with other Pokémon or even with human trainers. These friendships can be the central focus, showing how they support each other through various situations.