Free! x Pokemon (Click the images for larger size).
Story of Rei and Eevee
Rei thought Eevee is beautiful and perfect pokemon. (not sure what’s his standard) Eevee also knew that he loves his ‘beauty’. However, when Rei started to swimming, both of them couldn’t swim at all. Eevee wanted to evolve to Vaporeon to help him with swimming and Rei appreciated of his kindness. In the end, Eevee evolved to Vaporeon and help him with swimming.