Rule 34 Dev - 2019 5:4 alternate_color anal anal_sex animal_genitalia blue_eyes blush canine cum duo eeveelution erection feral fur furry fusion hybrid interspecies knot knotting male mammal nathan_(sylbreon) nintendo original_character paws penetration penis pokémon_(species) pokefound pokemon sex smile sylbreon sylveon umbreon video_games yaoi|3469383288