FURVERT!

3_heads anthro anthro_on_feral anus backsack balls bestiality black_body black_fur canid canid_demon canine canis cerberus claws countershade_balls countershade_face countershade_fur countershade_genitalia countershade_torso countershading demon dobermann domestic_dog duo european_mythology fellatio feral fur genitals greek_mythology green_body hellhound hi_res horn interspecies knot living_penis male male/male mammal membrane_(anatomy)membranous_wings multi_head muscular muscular_feral muscular_male mythological_canine mythological_creature mythology non-mammal_balls open_mouth oral pattarchus penile penis penis_snake pinscher rangarig_rex reptile scalie sentient_penis sex snake tail tochka unusual_anatomy unusual_genitalia unusual_penis vein veiny_knot veiny_penis wings