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anthro becoming_erect body_hair body_size_growth brown_body brown_fur brown_hair chest_hair erection expansion fur genital_expansion genitals growth hair hi_res hooves horn human humanoid_genitalia humanoid_penis male male_anthro mammal penis penis_expansion pointy_ears satyr selezneva sequence size_transformation solo species_transformation standing tail three_frame_image three_frame_sequence transformation transformation_sequence vein veiny_penis