It's hard to say exactly, but perhaps it could involve Eevee having a strong affection for Flareon's milk in a really cute and innocent way. Maybe Eevee discovers that Flareon's milk has some special properties that make it really appealing.
I'm not sure specifically about 'eevee loves flareon milk fanfiction'. There are many fanfiction platforms out there, like Archive of Our Own or FanFiction.net. You could try searching on those sites to see if such a fanfiction exists.
One possible plot is that Serena's Eevee is constantly daydreaming about Pikachu. Eevee follows Pikachu around secretly, observing all of Pikachu's actions. There could be a part where other Pokémon try to discourage Eevee because they think Pikachu is too popular and out of Eevee's league. But Eevee doesn't listen and keeps trying to get closer to Pikachu.
Maybe in a fanfiction world, there is a Pokémon festival where all kinds of Pokémon gather. Flareon and Glaceon are both there. Flareon is attracted to Glaceon's grace and beauty. Glaceon, on the other hand, is intrigued by Flareon's fiery spirit. They start spending time together during the festival, trying different games and foods. As the festival comes to an end and the fireworks light up the sky, they share a kiss, starting a new chapter in their relationship.
The fanfiction could revolve around a Flareon that was separated from its trainer. The tail wagging and barking then become ways for the Flareon to find its way back. It might encounter other Pokemon along the way who either help or hinder it. Maybe it meets a group of friendly Eevee evolutions who recognize the Flareon's distress through its barks and decide to assist it in reuniting with its trainer.
The plot might involve Ash turning into an Eevee and being found by a group of Eevee and their evolutions. They initially view him as an oddity since he has the memories and some of the behaviors of a human. Ash, as an Eevee, could then learn new skills from his new companions and use his knowledge from being a human trainer to help the group in various situations, such as finding food sources or avoiding predators.
One idea could be that Flareon's children are separated from their parent at a young age. They then have to fend for themselves and grow stronger. They meet other Pokemon who help them on their journey. They might also discover secrets about their family heritage that give them an edge in battles. As they grow, they aim to reunite with their Flareon parent and show how much they've grown and learned.
The plot could be that Eevee gets lost in a big, unfamiliar forest. Pikachu, being the kind-hearted Pokemon, goes to look for it. When they finally find each other, there's an instant spark. They then journey back together, sharing their experiences and getting to know each other better. This leads to them developing feelings for one another.
One reason could be that it's injured. Just like any living being, an injury can cause pain and distress, leading to whimpering. Another reason might be separation from its trainer. Flareon is a loyal Pokemon, and being apart from its trainer can be a very emotional experience for it.
Maybe in the fanfiction, Eevee and Vulpix are both lost in a mysterious forest. They start to look for a way out together. Along the way, they come across ancient Pokémon ruins. Inside the ruins, there are puzzles and traps. Eevee, being a very adaptable Pokémon, uses its different forms' abilities (even if it doesn't actually change forms yet in the story) to solve some of the puzzles. Vulpix uses its fire to light the way and keep away any dangerous Pokémon that might lurk in the dark corners of the ruins. As they progress, they become closer friends and finally find their way out of the forest.
Aroma who Loves Milk was one of the female protagonists in the fantasy novel " Battle Through the Heavens " and its derivative works written by Tian Can Tudou. She was the young lady of the Gu clan and had grown up in the Xiao clan since she was young. She had no blood relationship with Xiao Yan and was actually the daughter of the Gu clan's chief. She was extremely talented. After Xiao Yan practiced the Dou Technique 'Blazing Mantra,' his body was accompanied by a strange fragrance and was allergic to milk products. Therefore, Xiao Xun Er often drank milk to maintain the milk fragrance on her body. She used this to restrain Xiao Yan's Dou Qi strange fragrance, making it impossible for him to hide his tracks. Hurry up and click on the link below to return to the super classic original work," Battle Through the Heavens "!