rule 34 anal anal sex anthro black body black hair black nose black tail blue body blue fur blue tail canid duo ears back fur genitals green eyes hair humanoid imperatorcaesar inner ear fluff knot male mammal markings mechanical tentacles neck grab open mouth open smile penetration penis pivoted ears red hair red penis red tongue ridged penis signature simple background smile star marking teeth tentacle tongue tuft white background white ears white inner ear fluff 6503720