FURVERT!

anthro anthro_on_feral ball_inflation balls bestiality big_penis canid canine canis causationcorrelation cum_exchange domestic_dog duo feral genitals horn humanoid_genitalia humanoid_penis knotting male male/male mammal monochrome penetration penile penile_penetration penis penis_in_penis simple_background urethral urethral_knotting urethral_penetration