FURVERT!

4:3 anatomically_correct anatomically_correct_anus anatomically_correct_genitalia anatomically_correct_penis animal_genitalia animal_penis anthro anticipation anus backsack balls bdsm bondage bound butt equid equine equine_anus equine_genitalia equine_penis flared_penis genitals harness hi_res horse male mammal medial_ring muscular naughty_ram penis presenting presenting_hindquarters race_horse solo vein veiny_penis