FURVERT!

2013 animal_genitalia animal_penis anthro anus backsack balls big_penis biped blush brown_body brown_fur brown_hair butt equid equine equine_genitalia equine_penis erection fersir flared_penis fur genitals hair hooves horse looking_at_viewer lying male mammal muscular muscular_anthro muscular_male nude on_back penis presenting presenting_hindquarters puffy_anus raised_leg simple_background solo spread_legs spreading vein veiny_penis