FURVERT!

animal_genitalia animal_penis anthro athletic athletic_male balls canid canine canine_genitalia canine_penis duo genitals hi_res knot knotting longblueclaw male male/male mammal monochrome muscular muscular_male penetration penile penile_penetration penis penis_in_penis stretched_urethra urethra urethral urethral_bulge urethral_knotting urethral_penetration