rule 34 2019 4 fingers 4 toes animal genitalia animal penis anthro anus ass backsack balls bent over biped black body black fur black nose black stripes blue background border canid canine canine penis cheek tuft countershading digitigrade erection facial tuft fingers fox front view fully sheathed fur green eyes grey body grey fur hands behind back head tuft hi res inner ear fluff iztli knot looking away male mammal model sheet multicolored body multicolored fur multicolored tail multiple poses navel nude penis pose presenting presenting anus presenting hindquarters rear view reiu sheath simple background snout solo standing stripes toes tuft white body white border white countershading white fur wide stance 3519380