FURVERT!

2013 anakuro animal_genitalia animal_penis anthro balls big_penis black_body black_fur canid canine canine_genitalia canine_penis canis close-up crotch_shot digital_media_(artwork)erection fur genitals glans knot male mammal navel nude penis presenting sheath simple_background sketch solo spread_legs spreading urethra vein white_background wolf