Rule 34 Dev - abs animal_genitalia animal_penis anthro armpit_hair athletic balls beard biceps big_penis biped body_hair equine_genitalia equine_penis erection facial_hair flexing fur genitals goatee hair horn looking_at_viewer male muscular muscular_anthro nipples nude pecs penis pose presenting sheath solo standing vein sudonym mythology equid equine mammal mythological_creature mythological_equine unicorn monochrome sketch|1569160565