FURVERT!

animal_genitalia animal_penis anthro anthro_on_feral balls bestiality big_balls causationcorrelation cum_exchange duo equid equine equine_genitalia equine_penis erection feral genitals horn horse humanoid_genitalia humanoid_penis interspecies male male/male mammal monochrome penetration penile penile_penetration penis penis_in_penis simple_background stretched_urethra urethra urethral urethral_penetration