FURVERT!

1:1 2016 anatomically_correct anatomically_correct_anus anatomically_correct_genitalia anatomically_correct_penis animal_genitalia animal_penis anus backsack balls black_background digital_media_(artwork)equid equine equine_genitalia equine_penis erection feral fur genitals grey_body grey_eyes grey_fur hi_res hooves horse looking_at_viewer male mammal mane on_hind_legs penis perineum puffy_anus quadruped raised_tail rufciu signature simple_background solo tail underhoof vein veiny_penis