FURVERT!

2015 5:4 animal_genitalia animal_penis anus backsack balls butt equid equine equine_genitalia equine_penis feral fetlocks fulguris fur genitals grey_body grey_fur half-erect hi_res horn looking_at_viewer looking_back male mammal muscular muscular_feral muscular_male mythological_creature mythological_equine mythology penis quadruped smile solo star tail unicorn white_body white_fur xenoforge