Rule 34 Dev - anatomically_correct anatomically_correct_genitalia animal_genitalia animal_penis anus backsack balls big_balls big_penis black_anus black_balls black_body black_mane black_perineum black_tail bodily_fluids collar collar_only equine_anus equine_genitalia equine_penis feral flared_penis fur genital_fluids genitals glistening glistening_genitalia glistening_penis gradient_background grey_eyes hair leaking_precum looking_at_viewer looking_back looking_back_at_viewer lying male mane medial_ring muscular nude on_side penis perineum pink_nose pink_penis precum presenting presenting_anus presenting_penis puffy_anus raised_tail simple_background smile solo shuffur equid equine horse mammal absurd_res hi_res|8317760