rule 34 animal genitalia animal penis balls barely visible balls barely visible genitalia big penis black body black penis black tail colored equid equine penis feral forbidden fiend fully sheathed genitals hi res hooves long penis male male focus male only mammal medial ring mottled mottled genitalia mottled penis ms paint penis penis towards viewer pink penis shaded sheath simple background solo standing over viewer the fiend vein veiny penis 6438515