Well, it could be set in a time where there is a shortage of food in their Pokémon world. The male and female Eevee team up to find food for their group. Along the way, they have to deal with other Pokémon who are also after the limited resources. Their mutual support and cooperation during this tough time lead to a growing affection between them. They might find a hidden stash of food in an old abandoned den, and this discovery makes them closer as they realize how well they work together.
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 idea could be a story where a female Eevee evolves into Sylveon in a lemon grove. The sweet scent of the lemons could have some sort of magical influence on her evolution. Maybe it gives her powers related to the freshness and energy of the lemons, like the ability to heal others with a touch that smells like lemon blossoms.
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.
One plot idea could be that the male reader discovers an injured female Eevee in the forest. He takes her in and nurses her back to health. As she recovers, they form a strong bond, and the Eevee decides to stay with the reader instead of going back to the wild. Along the way, they face some challenges from other Pokémon or humans who don't understand their relationship.
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.
One idea could be Eevee going on a journey to discover its true evolution form among its friends. Another could be the friends teaming up to save a rare Pokemon in their habitat. Maybe Eevee and its friends get involved in a Pokemon contest and face various challenges.
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.
Well, one interesting aspect could be the unique bond that can be created between Ash and Eevee in these fanfictions. It might explore how Ash's adventures are affected by having an Eevee by his side in a more creative and unorthodox way compared to the official storylines.
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 common theme could be the transformation aspect of Eevee. Since Eevee can evolve into different forms, it might be explored in relation to the character's development in the story. Another could be the relationship with other Pokémon characters, which might add an interesting dynamic to the lemon - themed plot.
For a plot, Eevee might be left behind when its trainer goes on an adventure without realizing. Eevee whimpers as it watches the trainer leave. It then decides to go on its own adventure to find the trainer. Along the way, it meets different Pokemon species and has various challenges. It could also be that Eevee is at a Pokemon center where it sees other sick and injured Pokemon. The sight makes it whimper, and it tries to comfort the others. This leads to it making new friends and learning about the importance of kindness in the Pokemon world.